#include "config.h"#include "system.h"#include "coretypes.h"#include "backend.h"#include "target.h"#include "rtl.h"#include "tree.h"#include "gimple.h"#include "predict.h"#include "memmodel.h"#include "tm_p.h"#include "ssa.h"#include "optabs-tree.h"#include "cgraph.h"#include "dumpfile.h"#include "pretty-print.h"#include "alias.h"#include "fold-const.h"#include "stor-layout.h"#include "tree-eh.h"#include "gimplify.h"#include "gimple-iterator.h"#include "gimplify-me.h"#include "tree-ssa-loop-ivopts.h"#include "tree-ssa-loop-manip.h"#include "tree-ssa-loop.h"#include "cfgloop.h"#include "tree-scalar-evolution.h"#include "tree-vectorizer.h"#include "expr.h"#include "builtins.h"#include "tree-cfg.h"#include "tree-hash-traits.h"#include "vec-perm-indices.h"#include "internal-fn.h"#include "gimple-fold.h"#include "optabs-query.h"
Data Structures | |
| struct | _vect_peel_info |
| struct | _vect_peel_extended_info |
| struct | peel_info_hasher |
Macros | |
| #define | INCLUDE_ALGORITHM |
Typedefs | |
| typedef struct _vect_peel_info * | vect_peel_info |
| typedef struct _vect_peel_extended_info * | vect_peel_extended_info |
| #define INCLUDE_ALGORITHM |
Data References Analysis and Manipulation Utilities for Vectorization. Copyright (C) 2003-2025 Free Software Foundation, Inc. Contributed by Dorit Naishlos <dorit@il.ibm.com> and Ira Rosen <irar@il.ibm.com> This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>.
| typedef struct _vect_peel_extended_info * vect_peel_extended_info |
| typedef struct _vect_peel_info * vect_peel_info |
| tree bump_vector_ptr | ( | vec_info * | vinfo, |
| tree | dataref_ptr, | ||
| gimple * | ptr_incr, | ||
| gimple_stmt_iterator * | gsi, | ||
| stmt_vec_info | stmt_info, | ||
| tree | bump ) |
Function bump_vector_ptr
Increment a pointer (to a vector type) by vector-size. If requested,
i.e. if PTR-INCR is given, then also connect the new increment stmt
to the existing def-use update-chain of the pointer, by modifying
the PTR_INCR as illustrated below:
The pointer def-use update-chain before this function:
DATAREF_PTR = phi (p_0, p_2)
....
PTR_INCR: p_2 = DATAREF_PTR + step
The pointer def-use update-chain after this function:
DATAREF_PTR = phi (p_0, p_2)
....
NEW_DATAREF_PTR = DATAREF_PTR + BUMP
....
PTR_INCR: p_2 = NEW_DATAREF_PTR + step
Input:
DATAREF_PTR - ssa_name of a pointer (to vector type) that is being updated
in the loop.
PTR_INCR - optional. The stmt that updates the pointer in each iteration of
the loop. The increment amount across iterations is expected
to be vector_size.
BSI - location where the new update stmt is to be placed.
STMT_INFO - the original scalar memory-access stmt that is being vectorized.
BUMP - optional. The offset by which to bump the pointer. If not given,
the offset is assumed to be vector_size.
Output: Return NEW_DATAREF_PTR as illustrated above.
References build1(), copy_ssa_name(), DR_PTR_INFO, duplicate_ssa_name_ptr_info(), fold_build2, fold_convert, fold_stmt(), follow_all_ssa_edges(), FOR_EACH_SSA_USE_OPERAND, gcc_assert, gimple_build_assign(), gsi_for_stmt(), gsi_stmt(), is_gimple_min_invariant(), make_ssa_name(), mark_ptr_info_alignment_unknown(), operand_equal_p(), ptr_type_node, SET_USE, SSA_NAME_PTR_INFO, SSA_OP_USE, STMT_VINFO_DATA_REF, STMT_VINFO_VECTYPE, TREE_CODE, TREE_TYPE, TYPE_SIZE_UNIT, update_stmt(), USE_FROM_PTR, and vect_finish_stmt_generation().
Referenced by vectorizable_load(), and vectorizable_store().
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Return true if vectorizable_* routines can handle statements STMT1_INFO and STMT2_INFO being in a single group. When ALLOW_SLP_P, masked loads can be grouped in SLP mode.
References dyn_cast(), gimple_assign_single_p(), gimple_call_arg(), gimple_call_internal_fn(), gimple_call_internal_p(), operand_equal_p(), and strip_conversion().
Referenced by vect_analyze_data_ref_accesses().
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Return true if the minimum nonzero dependence distance for loop LOOP_DEPTH in DDR is >= VF.
References abs_hwi(), DDR_A, DDR_ARE_DEPENDENT, DDR_B, DDR_COULD_BE_INDEPENDENT_P, DDR_DIST_VECTS, DDR_NUM_DIST_VECTS, DDR_REVERSED_P, DR_REF, dump_enabled_p(), dump_printf_loc(), FOR_EACH_VEC_ELT, gcc_checking_assert, i, loop_depth(), MSG_NOTE, NULL_TREE, and vect_location.
Referenced by vect_prune_runtime_alias_test_list().
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Compare two data-references DRA and DRB to group them into chunks with related alignment.
References data_ref_compare_tree(), DR_BASE_ADDRESS, DR_INIT, DR_OFFSET, DR_STEP, DR_STMT, and gimple_uid().
Referenced by vect_enhance_data_refs_alignment().
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Compare two data-references DRA and DRB to group them into chunks suitable for grouping.
References data_ref_compare_tree(), dr_vec_info::dr, DR_BASE_ADDRESS, DR_INIT, DR_IS_READ, DR_OFFSET, DR_REF, DR_STEP, DR_STMT, gimple_uid(), dr_vec_info::group, TREE_TYPE, and TYPE_SIZE_UNIT.
Referenced by vect_analyze_data_ref_accesses().
| int dr_misalignment | ( | dr_vec_info * | dr_info, |
| tree | vectype, | ||
| poly_int64 | offset ) |
Return the misalignment of DR_INFO accessed in VECTYPE with OFFSET applied.
References dr_info::dr, dr_vec_info::dr, DR_GROUP_FIRST_ELEMENT, DR_INIT, DR_MISALIGNMENT_UNINITIALIZED, DR_MISALIGNMENT_UNKNOWN, gcc_assert, known_eq, STMT_VINFO_DR_INFO, STMT_VINFO_GROUPED_ACCESS, targetm, and TREE_INT_CST_LOW.
Referenced by aligned_access_p(), get_group_load_store_type(), get_load_store_type(), get_negative_load_store_type(), known_alignment_for_access_p(), vect_enhance_data_refs_alignment(), vect_get_peeling_costs_all_drs(), vect_known_alignment_in_bytes(), vect_peeling_supportable(), vect_vfa_access_size(), vector_alignment_reachable_p(), vectorizable_load(), and vectorizable_store().
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Dump LOWER_BOUND using flags DUMP_KIND. Dumps are known to be enabled.
References dump_dec(), dump_printf(), vec_lower_bound::expr, vec_lower_bound::min_value, and vec_lower_bound::unsigned_p.
Referenced by vect_check_lower_bound().
Given an memory reference EXP return whether its alignment is less than its size.
References exp(), get_object_alignment(), tree_fits_uhwi_p(), tree_to_uhwi(), TREE_TYPE, and TYPE_SIZE.
Referenced by vect_supportable_dr_alignment(), and vector_alignment_reachable_p().
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Helper function to identify a simd clone call. If this is a call to a function with simd clones then return the corresponding cgraph_node, otherwise return NULL.
References dyn_cast(), cgraph_node::get(), gimple_call_arg(), gimple_call_fndecl(), gimple_call_internal_p(), NULL, NULL_TREE, cgraph_node::simd_clones, and TREE_OPERAND.
Referenced by vect_get_smallest_scalar_type().
If OP is the result of a conversion, return the unconverted value, otherwise return null.
References CONVERT_EXPR_CODE_P, gimple_assign_rhs1(), gimple_assign_rhs_code(), is_gimple_assign(), NULL_TREE, SSA_NAME_DEF_STMT, and TREE_CODE.
Referenced by can_group_stmts_p().
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Analyze the access pattern of the data-reference DR_INFO. In case of non-consecutive accesses call vect_analyze_group_access() to analyze groups of accesses.
References compare_tree_int(), dr_info::dr, DR_GROUP_FIRST_ELEMENT, DR_GROUP_NEXT_ELEMENT, DR_IS_READ, DR_REF, DR_STEP, dump_enabled_p(), dump_printf_loc(), dyn_cast(), integer_zerop(), LOOP_VINFO_LOOP, MSG_MISSED_OPTIMIZATION, MSG_NOTE, nested_in_vect_loop_p(), NULL, loop::safelen, STMT_VINFO_DR_STEP, STMT_VINFO_GATHER_SCATTER_P, STMT_VINFO_GROUPED_ACCESS, STMT_VINFO_STRIDED_P, TREE_CODE, tree_int_cst_compare(), TREE_INT_CST_LOW, TREE_TYPE, TYPE_SIZE_UNIT, vect_analyze_group_access(), and vect_location.
Referenced by vect_analyze_data_ref_accesses().
| opt_result vect_analyze_data_ref_accesses | ( | vec_info * | vinfo, |
| vec< int > * | dataref_groups ) |
Function vect_analyze_data_ref_accesses.
Analyze the access pattern of all the data references in the loop.
FORNOW: the only access pattern that is considered vectorizable is a
simple step 1 (consecutive) access.
FORNOW: handle only arrays and pointer accesses.
References absu_hwi(), hash_set< KeyId, Lazy, Traits >::add(), hash_set< KeyId, Lazy, Traits >::begin(), can_group_stmts_p(), data_ref_compare_tree(), vec_info_shared::datarefs, dr_vec_info::dr, DR_BASE_ADDRESS, DR_GROUP_FIRST_ELEMENT, DR_GROUP_NEXT_ELEMENT, dr_group_sort_cmp(), DR_INIT, DR_IS_READ, DR_OFFSET, DR_REF, DR_STEP, DR_STMT, dump_enabled_p(), dump_printf_loc(), DUMP_VECT_SCOPE, hash_set< KeyId, Lazy, Traits >::end(), opt_result::failure_at(), FOR_EACH_VEC_ELT, g, gcc_assert, gimple_bb(), gimple_uid(), dr_vec_info::group, i, basic_block_def::index, is_a(), vec_info::lookup_dr(), MSG_MISSED_OPTIMIZATION, MSG_NOTE, loop::next, NULL, hash_set< KeyId, Lazy, Traits >::remove(), vec_info::shared, dr_vec_info::stmt, STMT_VINFO_DR_INFO, STMT_VINFO_GATHER_SCATTER_P, STMT_VINFO_SIMD_LANE_ACCESS_P, STMT_VINFO_SLP_VECT_ONLY, STMT_VINFO_STMT, STMT_VINFO_VECTORIZABLE, opt_result::success(), tree_fits_shwi_p(), tree_fits_uhwi_p(), tree_int_cst_equal(), TREE_INT_CST_LOW, tree_to_shwi(), tree_to_uhwi(), TREE_TYPE, TYPE_SIZE_UNIT, types_compatible_p(), vect_analyze_data_ref_access(), and vect_location.
Referenced by vect_analyze_loop_2(), and vect_slp_analyze_bb_1().
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Function vect_analyze_data_ref_dependence. FIXME: I needed to change the sense of the returned flag. Return FALSE if there (might) exist a dependence between a memory-reference DRA and a memory-reference DRB. When versioning for alias may check a dependence at run-time, return TRUE. Adjust *MAX_VF according to the data dependence.
References alias_sets_conflict_p(), chrec_dont_know, chrec_known, DDR_A, DDR_ARE_DEPENDENT, DDR_B, DDR_COULD_BE_INDEPENDENT_P, DDR_DIST_VECTS, DDR_LOOP_NEST, DDR_NUM_DIST_VECTS, DDR_REVERSED_P, DR_GROUP_FIRST_ELEMENT, DR_IS_READ, DR_IS_WRITE, DR_REF, dr_zero_step_indicator(), dump_enabled_p(), dump_printf_loc(), opt_result::failure_at(), FOR_EACH_VEC_ELT, gcc_unreachable, get_alias_set(), i, index_in_loop_nest(), loop::inner, integer_zerop(), vec_info::lookup_dr(), loop_depth(), LOOP_VINFO_LOOP, LOOP_VINFO_NO_DATA_DEPENDENCIES, MSG_MISSED_OPTIMIZATION, MSG_NOTE, nested_in_vect_loop_p(), loop::num, loop::safelen, dr_vec_info::stmt, STMT_VINFO_GATHER_SCATTER_P, STMT_VINFO_MIN_NEG_DIST, STMT_VINFO_STRIDED_P, STMT_VINFO_VECTORIZABLE, opt_result::success(), TREE_CODE, vect_analyze_possibly_independent_ddr(), vect_check_nonzero_value(), vect_location, vect_mark_for_runtime_alias_test(), and vect_preserves_scalar_order_p().
Referenced by vect_analyze_data_ref_dependences().
| opt_result vect_analyze_data_ref_dependences | ( | loop_vec_info | loop_vinfo, |
| unsigned int * | max_vf ) |
Function vect_analyze_data_ref_dependences. Examine all the data references in the loop, and make sure there do not exist any data dependences between them. Set *MAX_VF according to the maximum vectorization factor the data dependences allow.
References compute_all_dependences(), DUMP_VECT_SCOPE, FOR_EACH_VEC_ELT, gcc_assert, i, LOOP_VINFO_DATAREFS, LOOP_VINFO_DDRS, LOOP_VINFO_EARLY_BREAKS, LOOP_VINFO_EPILOGUE_P, LOOP_VINFO_LOOP_NEST, LOOP_VINFO_NO_DATA_DEPENDENCIES, LOOP_VINFO_ORIG_MAX_VECT_FACTOR, opt_result::success(), vect_analyze_data_ref_dependence(), and vect_analyze_early_break_dependences().
Referenced by vect_analyze_loop_2().
| opt_result vect_analyze_data_refs | ( | vec_info * | vinfo, |
| poly_uint64 * | min_vf, | ||
| bool * | fatal ) |
Function vect_analyze_data_refs.
Find all the data references in the loop or basic block.
The general structure of the analysis of data refs in the vectorizer is as
follows:
1- vect_analyze_data_refs(loop/bb): call
compute_data_dependences_for_loop/bb to find and analyze all data-refs
in the loop/bb and their dependences.
2- vect_analyze_dependences(): apply dependence testing using ddrs.
3- vect_analyze_drs_alignment(): check that ref_stmt.alignment is ok.
4- vect_analyze_drs_access(): check that ref_stmt.step is ok.
References as_a(), data_reference::aux, build_fold_indirect_ref, vec_info_shared::datarefs, DECL_NONALIASED, dr_analyze_innermost(), DR_BASE_ADDRESS, DR_INIT, DR_IS_READ, DR_IS_WRITE, DR_OFFSET, DR_REF, DR_STEP, DR_STMT, dump_enabled_p(), dump_generic_expr(), dump_printf(), dump_printf_loc(), DUMP_VECT_SCOPE, dyn_cast(), opt_result::failure_at(), fatal(), fold_build2, fold_build_pointer_plus, FOR_EACH_VEC_ELT, gcc_assert, get_base_address(), get_vectype_for_scalar_type(), i, is_a(), vec_info::lookup_stmt(), LOOP_VINFO_LOOP, MSG_MISSED_OPTIMIZATION, MSG_NOTE, nested_in_vect_loop_p(), NULL, gather_scatter_info::offset, vec_info::shared, data_reference::stmt, STMT_VINFO_DR_BASE_ADDRESS, STMT_VINFO_DR_BASE_ALIGNMENT, STMT_VINFO_DR_BASE_MISALIGNMENT, STMT_VINFO_DR_INIT, STMT_VINFO_DR_OFFSET, STMT_VINFO_DR_OFFSET_ALIGNMENT, STMT_VINFO_DR_STEP, STMT_VINFO_DR_STEP_ALIGNMENT, STMT_VINFO_DR_WRT_VEC_LOOP, STMT_VINFO_GATHER_SCATTER_P, STMT_VINFO_SIMD_LANE_ACCESS_P, STMT_VINFO_STRIDED_P, STMT_VINFO_VECTORIZABLE, STMT_VINFO_VECTYPE, opt_result::success(), TDF_DETAILS, TREE_CODE, TREE_THIS_VOLATILE, TREE_TYPE, TYPE_VECTOR_SUBPARTS(), unshare_expr(), VAR_P, vect_check_gather_scatter(), and vect_location.
Referenced by vect_analyze_loop_2(), and vect_slp_analyze_bb_1().
| opt_result vect_analyze_data_refs_alignment | ( | loop_vec_info | loop_vinfo | ) |
Function vect_analyze_data_refs_alignment Analyze the alignment of the data-references in the loop. Return FALSE if a data reference is found that cannot be vectorized.
References DR_GROUP_FIRST_ELEMENT, DUMP_VECT_SCOPE, FOR_EACH_VEC_ELT, i, vec_info::lookup_dr(), LOOP_VINFO_DATAREFS, STMT_VINFO_GROUPED_ACCESS, STMT_VINFO_VECTORIZABLE, STMT_VINFO_VECTYPE, opt_result::success(), vect_compute_data_ref_alignment(), and vect_record_base_alignments().
Referenced by vect_analyze_loop_2().
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Function vect_analyze_early_break_dependences.
Examine all the data references in the loop and make sure that if we have
multiple exits that we are able to safely move stores such that they become
safe for vectorization. The function also calculates the place where to move
the instructions to and computes what the new vUSE chain should be.
This works in tandem with the CFG that will be produced by
slpeel_tree_duplicate_loop_to_edge_cfg later on.
This function tries to validate whether an early break vectorization
is possible for the current instruction sequence. Returns True i
possible, otherwise False.
Requirements:
- Any memory access must be to a fixed size buffer.
- There must not be any loads and stores to the same object.
- Multiple loads are allowed as long as they don't alias.
NOTE:
This implementation is very conservative. Any overlapping loads/stores
that take place before the early break statement gets rejected aside from
WAR dependencies.
i.e.:
a[i] = 8
c = a[i]
if (b[i])
...
is not allowed, but
c = a[i]
a[i] = 8
if (b[i])
...
is which is the common case.
References DR_IS_READ, DR_IS_WRITE, dr_may_alias_p(), DR_REF, DR_SCALAR_KNOWN_BOUNDS, dr_set_safe_speculative_read_required(), dump_enabled_p(), dump_printf_loc(), DUMP_VECT_SCOPE, opt_result::failure_at(), g, gcc_assert, get_virtual_phi(), gimple_vdef(), gimple_vuse(), gsi_end_p(), gsi_last_bb(), gsi_prev(), gsi_stmt(), loop::header, basic_block_def::index, is_empty(), is_gimple_debug(), last, loop::latch, vec_info::lookup_stmt(), basic_block_def::loop_father, loop_outer(), LOOP_VINFO_EARLY_BREAKS_VECT_PEELED, LOOP_VINFO_EARLY_BRK_DEST_BB, LOOP_VINFO_EARLY_BRK_STORES, LOOP_VINFO_EARLY_BRK_VUSES, LOOP_VINFO_LOOP, MSG_MISSED_OPTIMIZATION, MSG_NOTE, NULL, ref_within_array_bound(), single_pred(), single_pred_p(), STMT_VINFO_DATA_REF, STMT_VINFO_DR_INFO, opt_result::success(), vect_location, and vect_stmt_to_vectorize().
Referenced by vect_analyze_data_ref_dependences().
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Analyze groups of accesses: check that DR_INFO belongs to a group of accesses of legal size, step, etc. Detect gaps, single element interleaving, and other special cases. Set grouped access info. Collect groups of strided stores for further use in SLP analysis.
References DR_GROUP_FIRST_ELEMENT, DR_GROUP_NEXT_ELEMENT, NULL, and vect_analyze_group_access_1().
Referenced by vect_analyze_data_ref_access().
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Analyze groups of accesses: check that DR_INFO belongs to a group of accesses of legal size, step, etc. Detect gaps, single element interleaving, and other special cases. Set grouped access info. Collect groups of strided stores for further use in SLP analysis. Worker for vect_analyze_group_access.
References absu_hwi(), BB_VINFO_GROUPED_STORES, count, dr_info::dr, DR_GROUP_FIRST_ELEMENT, DR_GROUP_GAP, DR_GROUP_NEXT_ELEMENT, DR_GROUP_SIZE, DR_INIT, DR_IS_READ, DR_IS_WRITE, DR_REF, DR_STEP, dump_enabled_p(), dump_printf(), dump_printf_loc(), dyn_cast(), gcc_assert, gcc_checking_assert, LOOP_VINFO_GROUPED_STORES, MSG_MISSED_OPTIMIZATION, MSG_NOTE, operand_equal_p(), STMT_VINFO_DATA_REF, STMT_VINFO_STRIDED_P, STMT_VINFO_VECTORIZABLE, tree_fits_shwi_p(), tree_int_cst_compare(), TREE_INT_CST_LOW, tree_to_shwi(), TREE_TYPE, TYPE_SIZE_UNIT, UINT_MAX, and vect_location.
Referenced by vect_analyze_group_access().
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A subroutine of vect_analyze_data_ref_dependence. Handle DDR_COULD_BE_INDEPENDENT_P ddr DDR that has a known set of dependence distances. These distances are conservatively correct but they don't reflect a guaranteed dependence. Return true if this function does all the work necessary to avoid an alias or false if the caller should use the dependence distances to limit the vectorization factor in the usual way. LOOP_DEPTH is the depth of the loop described by LOOP_VINFO and the other arguments are as for vect_analyze_data_ref_dependence.
References abs_hwi(), DDR_A, DDR_B, DDR_DIST_VECTS, DDR_REVERSED_P, vec_info::lookup_dr(), loop_depth(), LOOP_VINFO_LOOP, LOOP_VINFO_NO_DATA_DEPENDENCIES, loop::safelen, dr_vec_info::stmt, STMT_VINFO_GATHER_SCATTER_P, and vect_mark_for_runtime_alias_test().
Referenced by vect_analyze_data_ref_dependence().
| bool vect_can_force_dr_alignment_p | ( | const_tree | decl, |
| poly_uint64 | alignment ) |
Function vect_force_dr_alignment_p. Returns whether the alignment of a DECL can be forced to be aligned on ALIGNMENT bit boundary.
References decl_in_symtab_p(), symtab_node::get(), known_le, MAX_OFILE_ALIGNMENT, MAX_STACK_ALIGNMENT, TREE_STATIC, and VAR_P.
Referenced by increase_alignment(), and vect_compute_data_ref_alignment().
| bool vect_check_gather_scatter | ( | stmt_vec_info | stmt_info, |
| loop_vec_info | loop_vinfo, | ||
| gather_scatter_info * | info, | ||
| vec< int > * | elsvals ) |
Return true if a non-affine read or write in STMT_INFO is suitable for a gather load or scatter store. Describe the operation in *INFO if so. If it is suitable and ELSVALS is nonzero store the supported else values in the vector it points to.
References gather_scatter_info::base, build_fold_addr_expr, CASE_CONVERT, gather_scatter_info::decl, do_add(), DR_IS_READ, DR_REF, dyn_cast(), gather_scatter_info::element_type, expr_invariant_in_loop_p(), extract_ops_from_tree(), fold_convert, get_gimple_rhs_class(), get_inner_reference(), gimple_assign_rhs1(), gimple_assign_rhs2(), gimple_assign_rhs_code(), gimple_call_internal_fn(), gimple_call_internal_p(), GIMPLE_TERNARY_RHS, gather_scatter_info::ifn, integer_zerop(), INTEGRAL_TYPE_P, internal_fn_mask_index(), internal_gather_scatter_fn_p(), is_gimple_assign(), LOOP_VINFO_EPILOGUE_P, LOOP_VINFO_LOOP, LOOP_VINFO_ORIG_LOOP_INFO, may_be_nonaddressable_p(), mem_ref_offset(), gather_scatter_info::memory_type, NULL_TREE, gather_scatter_info::offset, gather_scatter_info::offset_dt, gather_scatter_info::offset_vectype, operand_equal_p(), POINTER_TYPE_P, gather_scatter_info::scale, signed_char_type_node, size_binop, size_int, size_zero_node, sizetype, SSA_NAME_DEF_STMT, STMT_VINFO_DATA_REF, STMT_VINFO_VECTYPE, STRIP_NOPS, supports_vec_gather_load_p(), supports_vec_scatter_store_p(), targetm, TREE_CODE, tree_fits_shwi_p(), TREE_OPERAND, tree_to_shwi(), TREE_TYPE, TYPE_MODE, TYPE_PRECISION, TYPE_SIZE, unsigned_char_type_node, vect_describe_gather_scatter_call(), vect_gather_scatter_fn_p(), vect_unknown_def_type, and wide_int_to_tree().
Referenced by get_load_store_type(), vect_analyze_data_refs(), vect_detect_hybrid_slp(), vect_get_and_check_slp_defs(), vect_mark_stmts_to_be_vectorized(), vect_recog_gather_scatter_pattern(), and vect_use_strided_gather_scatters_p().
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Record that the vectorized loop requires the vec_lower_bound described by EXPR, UNSIGNED_P and MIN_VALUE.
References dump_enabled_p(), dump_lower_bound(), dump_printf(), dump_printf_loc(), i, LOOP_VINFO_LOWER_BOUNDS, MSG_NOTE, operand_equal_p(), and vect_location.
Referenced by vect_prune_runtime_alias_test_list().
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Record that loop LOOP_VINFO needs to check that VALUE is nonzero.
References dump_enabled_p(), dump_printf_loc(), i, LOOP_VINFO_CHECK_NONZERO, MSG_NOTE, and vect_location.
Referenced by vect_analyze_data_ref_dependence().
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Function vect_no_alias_p.
Given data references A and B with equal base and offset, see whether
the alias relation can be decided at compilation time. Return 1 if
it can and the references alias, 0 if it can and the references do
not alias, and -1 if we cannot decide at compile time. SEGMENT_LENGTH_A,
SEGMENT_LENGTH_B, ACCESS_SIZE_A and ACCESS_SIZE_B are the equivalent
of dr_with_seg_len::{seg_len,access_size} for A and B.
References a, b, DR_INIT, DR_STEP, size_zero_node, wi::to_poly_offset(), wi::to_poly_wide(), tree_int_cst_compare(), and tree_to_poly_uint64().
Referenced by vect_prune_runtime_alias_test_list().
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Function vect_compute_data_ref_alignment Compute the misalignment of the data reference DR_INFO when vectorizing with VECTYPE. Output: 1. initialized misalignment info for DR_INFO FOR NOW: No analysis is actually performed. Misalignment is calculated only for trivial cases. TODO.
References innermost_loop_behavior::base_address, innermost_loop_behavior::base_alignment, vec_info::base_alignments, innermost_loop_behavior::base_misalignment, CDI_DOMINATORS, dominated_by_p(), dr_info::dr, DR_GROUP_FIRST_ELEMENT, DR_GROUP_SIZE, DR_MISALIGNMENT_UNKNOWN, DR_REF, dr_safe_speculative_read_required(), DR_STEP_ALIGNMENT, dump_dec(), dump_enabled_p(), dump_printf(), dump_printf_loc(), dyn_cast(), poly_int< N, C >::force_shwi(), gcc_assert, hash_map< KeyId, Value, Traits >::get(), get_base_for_alignment(), gimple_bb(), innermost_loop_behavior::init, integer_zerop(), poly_int< N, C >::is_constant(), LOOP_VINFO_LOOP, LOOP_VINFO_ORIG_LOOP_INFO, LOOP_VINFO_PEELING_FOR_ALIGNMENT, LOOP_VINFO_VECT_FACTOR, MSG_MISSED_OPTIMIZATION, MSG_NOTE, nested_in_vect_loop_p(), NULL, innermost_loop_behavior::offset_alignment, pow2p_hwi(), SET_DR_MISALIGNMENT, SET_DR_TARGET_ALIGNMENT, innermost_loop_behavior::step, innermost_loop_behavior::step_alignment, STMT_VINFO_GATHER_SCATTER_P, STMT_VINFO_GROUPED_ACCESS, targetm, wi::to_poly_offset(), TREE_CODE, TREE_INT_CST_LOW, TREE_TYPE, TYPE_SIZE_UNIT, vect_can_force_dr_alignment_p(), vect_dr_behavior(), and vect_location.
Referenced by vect_analyze_data_refs_alignment(), and vect_slp_analyze_node_alignment().
Copy memory reference info such as base/clique from the SRC reference to the DEST MEM_REF.
References handled_component_p(), MR_DEPENDENCE_BASE, MR_DEPENDENCE_CLIQUE, TREE_CODE, and TREE_OPERAND.
Referenced by vect_setup_realignment(), vectorizable_load(), vectorizable_scan_store(), and vectorizable_store().
| tree vect_create_addr_base_for_vector_ref | ( | vec_info * | vinfo, |
| stmt_vec_info | stmt_info, | ||
| gimple_seq * | new_stmt_list, | ||
| tree | offset ) |
Function vect_create_addr_base_for_vector_ref.
Create an expression that computes the address of the first memory location
that will be accessed for a data reference.
Input:
STMT_INFO: The statement containing the data reference.
NEW_STMT_LIST: Must be initialized to NULL_TREE or a statement list.
OFFSET: Optional. If supplied, it is be added to the initial address.
LOOP: Specify relative to which loop-nest should the address be computed.
For example, when the dataref is in an inner-loop nested in an
outer-loop that is now being vectorized, LOOP can be either the
outer-loop, or the inner-loop. The first memory location accessed
by the following dataref ('in' points to short):
for (i=0; i<N; i++)
for (j=0; j<M; j++)
s += in[i+j]
is as follows:
if LOOP=i_loop: &in (relative to i_loop)
if LOOP=j_loop: &in+i*2B (relative to j_loop)
Output:
1. Return an SSA_NAME whose value is the address of the memory location of
the first vector of the data reference.
2. If new_stmt_list is not NULL_TREE after return then the caller must insert
these statement(s) which define the returned SSA_NAME.
FORNOW: We are only handling array accesses with step 1.
References innermost_loop_behavior::base_address, build1(), build_pointer_type(), dr_info::dr, DR_PTR_INFO, DR_REF, dump_enabled_p(), dump_printf_loc(), dyn_cast(), fold_build2, fold_build_pointer_plus, fold_convert, force_gimple_operand(), gcc_assert, get_dr_vinfo_offset(), get_name(), gimple_seq_add_seq(), innermost_loop_behavior::init, MSG_NOTE, NULL, size_binop, sizetype, SSA_NAME_PTR_INFO, SSA_NAME_VAR, ssize_int, STMT_VINFO_DR_INFO, strip_zero_offset_components(), TREE_CODE, TREE_TYPE, unshare_expr(), vect_dr_behavior(), vect_duplicate_ssa_name_ptr_info(), vect_get_new_vect_var(), vect_location, and vect_pointer_var.
Referenced by get_misalign_in_elems(), vect_create_cond_for_align_checks(), vect_create_data_ref_ptr(), and vect_setup_realignment().
| tree vect_create_data_ref_ptr | ( | vec_info * | vinfo, |
| stmt_vec_info | stmt_info, | ||
| tree | aggr_type, | ||
| class loop * | at_loop, | ||
| tree | offset, | ||
| tree * | initial_address, | ||
| gimple_stmt_iterator * | gsi, | ||
| gimple ** | ptr_incr, | ||
| bool | only_init, | ||
| tree | iv_step ) |
Function vect_create_data_ref_ptr.
Create a new pointer-to-AGGR_TYPE variable (ap), that points to the first
location accessed in the loop by STMT_INFO, along with the def-use update
chain to appropriately advance the pointer through the loop iterations.
Also set aliasing information for the pointer. This pointer is used by
the callers to this function to create a memory reference expression for
vector load/store access.
Input:
1. STMT_INFO: a stmt that references memory. Expected to be of the form
GIMPLE_ASSIGN <name, data-ref> or
GIMPLE_ASSIGN <data-ref, name>.
2. AGGR_TYPE: the type of the reference, which should be either a vector
or an array.
3. AT_LOOP: the loop where the vector memref is to be created.
4. OFFSET (optional): a byte offset to be added to the initial address
accessed by the data-ref in STMT_INFO.
5. BSI: location where the new stmts are to be placed if there is no loop
6. ONLY_INIT: indicate if ap is to be updated in the loop, or remain
pointing to the initial address.
8. IV_STEP (optional, defaults to NULL): the amount that should be added
to the IV during each iteration of the loop. NULL says to move
by one copy of AGGR_TYPE up or down, depending on the step of the
data reference.
Output:
1. Declare a new ptr to vector_type, and have it point to the base of the
data reference (initial addressed accessed by the data reference).
For example, for vector of type V8HI, the following code is generated:
v8hi *ap;
ap = (v8hi *)initial_address;
if OFFSET is not supplied:
initial_address = &a[init];
if OFFSET is supplied:
initial_address = &a[init] + OFFSET;
if BYTE_OFFSET is supplied:
initial_address = &a[init] + BYTE_OFFSET;
Return the initial_address in INITIAL_ADDRESS.
2. If ONLY_INIT is true, just return the initial pointer. Otherwise, also
update the pointer in each iteration of the loop.
Return the increment stmt that updates the pointer in PTR_INCR.
3. Return the pointer.
References alias_sets_conflict_p(), build_pointer_type_for_mode(), create_iv(), dr_info::dr, DR_BASE_ADDRESS, DR_BASE_OBJECT, DR_GROUP_FIRST_ELEMENT, DR_GROUP_NEXT_ELEMENT, DR_GROUP_SIZE, DR_PTR_INFO, DR_REF, DR_STEP, dump_enabled_p(), dump_printf(), dump_printf_loc(), dyn_cast(), fold_build1, fold_convert, gcc_assert, gcc_unreachable, get_alias_set(), get_name(), get_tree_code_name(), gimple_bb(), gsi_insert_seq_before(), gsi_insert_seq_on_edge_immediate(), GSI_SAME_STMT, gsi_stmt(), integer_zerop(), loop_preheader_edge(), LOOP_VINFO_LOOP, MSG_NOTE, nested_in_vect_loop_p(), NULL, NULL_TREE, standard_iv_increment_position(), innermost_loop_behavior::step, STMT_VINFO_DATA_REF, STMT_VINFO_DR_INFO, TREE_CODE, tree_int_cst_sgn(), TREE_TYPE, TYPE_SIZE_UNIT, vect_create_addr_base_for_vector_ref(), vect_dr_behavior(), vect_duplicate_ssa_name_ptr_info(), vect_get_new_vect_var(), vect_location, and vect_pointer_var.
Referenced by vect_setup_realignment(), vectorizable_load(), and vectorizable_store().
Function vect_create_destination_var. Create a new temporary of type VECTYPE.
References free(), gcc_assert, get_name(), SSA_NAME_VERSION, TREE_CODE, TREE_TYPE, vect_get_new_vect_var(), vect_mask_var, vect_scalar_var, vect_simple_var, and VECTOR_BOOLEAN_TYPE_P.
Referenced by permute_vec_elements(), read_vector_array(), vect_create_epilog_for_reduction(), vect_setup_realignment(), vect_transform_cycle_phi(), vect_transform_lc_phi(), vect_transform_reduction(), vect_transform_slp_perm_load_1(), vectorizable_assignment(), vectorizable_call(), vectorizable_comparison_1(), vectorizable_condition(), vectorizable_conversion(), vectorizable_load(), vectorizable_operation(), vectorizable_phi(), vectorizable_shift(), vectorizable_simd_clone_call(), vectorizable_store(), and vectorize_fold_left_reduction().
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STMT_INFO is a call to an internal gather load or scatter store function. Describe the operation in INFO.
References as_a(), gather_scatter_info::base, gather_scatter_info::decl, DR_REF, gather_scatter_info::element_type, gimple_call_arg(), gimple_call_internal_fn(), gather_scatter_info::ifn, gather_scatter_info::memory_type, NULL_TREE, gather_scatter_info::offset, gather_scatter_info::offset_dt, gather_scatter_info::offset_vectype, gather_scatter_info::scale, STMT_VINFO_DATA_REF, STMT_VINFO_VECTYPE, TREE_INT_CST_LOW, TREE_TYPE, and vect_unknown_def_type.
Referenced by vect_check_gather_scatter().
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Return whether DR_INFO is aligned if DR_PEEL_INFO is made aligned via peeling.
References dr_info::dr, dr_vec_info::dr, DR_BASE_ADDRESS, DR_OFFSET, DR_STEP, operand_equal_p(), and vect_dr_aligned_if_related_peeled_dr_is().
Referenced by vect_get_peeling_costs_all_drs(), vect_peeling_supportable(), and vect_update_misalignment_for_peel().
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Return whether DR_INFO, which is related to DR_PEEL_INFO in that it only differs in DR_INIT, is aligned if DR_PEEL_INFO is made aligned via peeling.
References dr_info::dr, dr_vec_info::dr, DR_INIT, DR_TARGET_ALIGNMENT, known_eq, and wi::to_poly_offset().
Referenced by vect_dr_aligned_if_peeled_dr_is(), and vect_enhance_data_refs_alignment().
| int vect_dr_misalign_for_aligned_access | ( | dr_vec_info * | dr_info | ) |
Compute the value for dr_info->misalign so that the access appears aligned. This is used by peeling to compensate for dr_misalignment applying the offset for negative step.
References dr_info::dr, DR_MISALIGNMENT_UNKNOWN, DR_STEP, STMT_VINFO_VECTYPE, TREE_INT_CST_LOW, tree_int_cst_sgn(), TREE_TYPE, TYPE_SIZE_UNIT, and TYPE_VECTOR_SUBPARTS().
Referenced by vect_enhance_data_refs_alignment(), and vect_update_misalignment_for_peel().
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Duplicate points-to info on NAME from DR_INFO.
References dr_info::dr, DR_PTR_INFO, duplicate_ssa_name_ptr_info(), mark_ptr_info_alignment_unknown(), and SSA_NAME_PTR_INFO.
Referenced by vect_create_addr_base_for_vector_ref(), and vect_create_data_ref_ptr().
| opt_result vect_enhance_data_refs_alignment | ( | loop_vec_info | loop_vinfo | ) |
Function vect_enhance_data_refs_alignment
This pass will use loop versioning and loop peeling in order to enhance
the alignment of data references in the loop.
FOR NOW: we assume that whatever versioning/peeling takes place, only the
original loop is to be vectorized. Any other loops that are created by
the transformations performed in this pass - are not supposed to be
vectorized. This restriction will be relaxed.
This pass will require a cost model to guide it whether to apply peeling
or versioning or a combination of the two. For example, the scheme that
intel uses when given a loop with several memory accesses, is as follows:
choose one memory access ('p') which alignment you want to force by doing
peeling. Then, either (1) generate a loop in which 'p' is aligned and all
other accesses are not necessarily aligned, or (2) use loop versioning to
generate one loop in which all accesses are aligned, and another loop in
which only 'p' is necessarily aligned.
("Automatic Intra-Register Vectorization for the Intel Architecture",
Aart J.C. Bik, Milind Girkar, Paul M. Grey and Ximmin Tian, International
Journal of Parallel Programming, Vol. 30, No. 2, April 2002.)
Devising a cost model is the most critical aspect of this work. It will
guide us on which access to peel for, whether to use loop versioning, how
many versions to create, etc. The cost model will probably consist of
generic considerations as well as target specific considerations (on
powerpc for example, misaligned stores are more painful than misaligned
loads).
Here are the general steps involved in alignment enhancements:
-- original loop, before alignment analysis:
for (i=0; i<N; i++){
x = q[i]; # DR_MISALIGNMENT(q) = unknown
p[i] = y; # DR_MISALIGNMENT(p) = unknown
}
-- After vect_compute_data_refs_alignment:
for (i=0; i<N; i++){
x = q[i]; # DR_MISALIGNMENT(q) = 3
p[i] = y; # DR_MISALIGNMENT(p) = unknown
}
-- Possibility 1: we do loop versioning:
if (p is aligned) {
for (i=0; i<N; i++){ # loop 1A
x = q[i]; # DR_MISALIGNMENT(q) = 3
p[i] = y; # DR_MISALIGNMENT(p) = 0
}
}
else {
for (i=0; i<N; i++){ # loop 1B
x = q[i]; # DR_MISALIGNMENT(q) = 3
p[i] = y; # DR_MISALIGNMENT(p) = unaligned
}
}
-- Possibility 2: we do loop peeling:
for (i = 0; i < 3; i++){ # (scalar loop, not to be vectorized).
x = q[i];
p[i] = y;
}
for (i = 3; i < N; i++){ # loop 2A
x = q[i]; # DR_MISALIGNMENT(q) = 0
p[i] = y; # DR_MISALIGNMENT(p) = unknown
}
-- Possibility 3: combination of loop peeling and versioning:
for (i = 0; i < 3; i++){ # (scalar loop, not to be vectorized).
x = q[i];
p[i] = y;
}
if (p is aligned) {
for (i = 3; i<N; i++){ # loop 3A
x = q[i]; # DR_MISALIGNMENT(q) = 0
p[i] = y; # DR_MISALIGNMENT(p) = 0
}
}
else {
for (i = 3; i<N; i++){ # loop 3B
x = q[i]; # DR_MISALIGNMENT(q) = 0
p[i] = y; # DR_MISALIGNMENT(p) = unaligned
}
}
These loops are later passed to loop_transform to be vectorized. The
vectorizer will use the alignment information to guide the transformation
(whether to generate regular loads/stores, or with special handling for
misalignment).
References aligned_access_p(), _vect_peel_info::count, dr_vec_info::dr, dr_align_group_sort_cmp(), DR_BASE_ADDRESS, DR_GROUP_SIZE, _vect_peel_info::dr_info, DR_IS_WRITE, dr_misalignment(), DR_MISALIGNMENT_UNKNOWN, DR_OFFSET, DR_STEP, DR_STEP_ALIGNMENT, DR_TARGET_ALIGNMENT, dr_unaligned_unsupported, dump_enabled_p(), dump_printf_loc(), DUMP_VECT_SCOPE, flow_loop_nested_p(), FOR_EACH_VEC_ELT, gcc_assert, GET_MODE_SIZE(), i, loop::inner, _vect_peel_extended_info::inside_cost, INT_MAX, is_empty(), known_alignment_for_access_p(), known_le, vec_info::lookup_dr(), loop_cost_model(), loop_preheader_edge(), LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT, LOOP_VINFO_DATAREFS, LOOP_VINFO_EARLY_BREAKS_VECT_PEELED, LOOP_VINFO_INT_NITERS, LOOP_VINFO_IV_EXIT, LOOP_VINFO_LOOP, LOOP_VINFO_MAY_MISALIGN_STMTS, LOOP_VINFO_NITERS_KNOWN_P, LOOP_VINFO_PEELING_FOR_ALIGNMENT, LOOP_VINFO_PTR_MASK, LOOP_VINFO_SCALAR_ITERATION_COST, LOOP_VINFO_UNALIGNED_DR, LOOP_VINFO_VECT_FACTOR, MAX, MSG_MISSED_OPTIMIZATION, MSG_NOTE, _vect_peel_info::npeel, NULL, operand_equal_p(), optimize_loop_nest_for_speed_p(), outermost_invariant_loop_for_expr(), _vect_peel_extended_info::outside_cost, _vect_peel_extended_info::peel_info, SET_DR_MISALIGNMENT, size_zero_node, slpeel_can_duplicate_loop_p(), dr_vec_info::stmt, STMT_SLP_TYPE, STMT_VINFO_DR_INFO, STMT_VINFO_GROUPED_ACCESS, STMT_VINFO_STRIDED_P, STMT_VINFO_VECTYPE, opt_result::success(), target_align(), tree_int_cst_compare(), TREE_INT_CST_LOW, TREE_TYPE, TYPE_MODE, TYPE_SIZE_UNIT, TYPE_VECTOR_SUBPARTS(), unlimited_cost_model(), vect_can_advance_ivs_p(), VECT_COST_MODEL_CHEAP, vect_dr_aligned_if_related_peeled_dr_is(), vect_dr_misalign_for_aligned_access(), vect_get_known_peeling_cost(), vect_get_peeling_costs_all_drs(), vect_get_scalar_dr_size(), vect_location, vect_peeling_hash_choose_best_peeling(), vect_peeling_hash_insert(), vect_peeling_supportable(), vect_relevant_for_alignment_p(), vect_supportable_dr_alignment(), vect_update_misalignment_for_peel(), vect_vf_for_cost(), and vector_alignment_reachable_p().
Referenced by vect_analyze_loop_2().
| opt_result vect_find_stmt_data_reference | ( | loop_p | loop, |
| gimple * | stmt, | ||
| vec< data_reference_p > * | datarefs, | ||
| vec< int > * | dataref_groups, | ||
| int | group_id ) |
Find the data references in STMT, analyze them with respect to LOOP and append them to DATAREFS. Return false if datarefs in this stmt cannot be handled.
References data_reference::aux, cfun, CONVERT_EXPR_CODE_P, CONVERT_EXPR_P, create_data_ref(), DECL_BIT_FIELD, DR_BASE_ADDRESS, DR_INIT, DR_IS_CONDITIONAL_IN_STMT, DR_IS_READ, DR_OFFSET, DR_OFFSET_ALIGNMENT, DR_REF, DR_STEP, DR_STEP_ALIGNMENT, dyn_cast(), opt_result::failure_at(), find_data_references_in_stmt(), free_data_ref(), gcc_assert, gimple_assign_rhs1(), gimple_assign_rhs_code(), gimple_call_arg(), gimple_call_internal_fn(), gimple_call_internal_p(), gimple_clobber_p(), gimple_has_volatile_ops(), highest_pow2_factor(), integer_zerop(), INTEGRAL_TYPE_P, is_gimple_assign(), is_gimple_call(), loop_containing_stmt(), NULL, loop::simduid, SSA_NAME_DEF_STMT, SSA_NAME_VAR, ssize_int, data_reference::stmt, stmt_can_throw_internal(), STRIP_NOPS, opt_result::success(), TREE_CODE, tree_fits_uhwi_p(), tree_int_cst_equal(), TREE_OPERAND, tree_to_uhwi(), TREE_TYPE, TYPE_PRECISION, and TYPE_SIZE_UNIT.
Referenced by vect_get_datarefs_in_loop(), and vect_slp_bbs().
| bool vect_gather_scatter_fn_p | ( | vec_info * | vinfo, |
| bool | read_p, | ||
| bool | masked_p, | ||
| tree | vectype, | ||
| tree | memory_type, | ||
| tree | offset_type, | ||
| int | scale, | ||
| internal_fn * | ifn_out, | ||
| tree * | offset_vectype_out, | ||
| vec< int > * | elsvals ) |
Check whether we can use an internal function for a gather load or scatter store. READ_P is true for loads and false for stores. MASKED_P is true if the load or store is conditional. MEMORY_TYPE is the type of the memory elements being loaded or stored. OFFSET_TYPE is the type of the offset that is being applied to the invariant base address. SCALE is the amount by which the offset should be multiplied *after* it has been converted to address width. Return true if the function is supported, storing the function id in *IFN_OUT and the vector type for the offset in *OFFSET_VECTYPE_OUT. If we can use gather and store the possible else values in ELSVALS.
References build_nonstandard_integer_type(), get_vectype_for_scalar_type(), internal_gather_scatter_fn_supported_p(), POINTER_SIZE, tree_to_uhwi(), TYPE_PRECISION, TYPE_SIZE, TYPE_UNSIGNED, and vector_element_bits().
Referenced by vect_check_gather_scatter(), and vect_truncate_gather_scatter_offset().
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Calculate the cost of the memory access represented by DR_INFO.
References dr_info::dr, DR_IS_READ, dump_enabled_p(), dump_printf_loc(), dyn_cast(), MSG_NOTE, NULL, PURE_SLP_STMT, STMT_VINFO_VECTYPE, vect_get_load_cost(), vect_get_num_copies(), vect_get_store_cost(), and vect_location.
Referenced by vect_get_peeling_costs_all_drs().
| tree vect_get_new_ssa_name | ( | tree | type, |
| enum vect_var_kind | var_kind, | ||
| const char * | name ) |
Like vect_get_new_vect_var but return an SSA name.
References free(), gcc_unreachable, make_temp_ssa_name(), NULL, vect_pointer_var, vect_scalar_var, and vect_simple_var.
Referenced by vect_build_one_gather_load_call(), vect_build_one_scatter_store_call(), vect_init_vector(), vectorizable_call(), vectorizable_induction(), vectorizable_load(), and vectorizable_store().
| tree vect_get_new_vect_var | ( | tree | type, |
| enum vect_var_kind | var_kind, | ||
| const char * | name ) |
Function vect_get_new_vect_var. Returns a name for a new variable. The current naming scheme appends the prefix "vect_" or "vect_p" (depending on the value of VAR_KIND) to the name of vectorizer generated variables, and appends that to NAME if provided.
References create_tmp_reg(), free(), gcc_unreachable, NULL, vect_mask_var, vect_pointer_var, vect_scalar_var, and vect_simple_var.
Referenced by permute_vec_elements(), vect_create_addr_base_for_vector_ref(), vect_create_data_ref_ptr(), vect_create_destination_var(), vectorizable_induction(), vectorizable_nonlinear_induction(), and vectorizable_recurr().
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Get the costs of peeling NPEEL iterations for LOOP_VINFO, checking data access costs for all data refs. If UNKNOWN_MISALIGNMENT is true, npeel is computed at runtime but DR0_INFO's misalignment will be zero after peeling.
References dr_info::dr, dr_misalignment(), DR_MISALIGNMENT_UNKNOWN, DR_STEP, DR_TARGET_ALIGNMENT, known_alignment_for_access_p(), vec_info::lookup_dr(), LOOP_VINFO_DATAREFS, _vect_peel_info::npeel, size_zero_node, dr_vec_info::stmt, STMT_VINFO_VECTYPE, tree_int_cst_compare(), TREE_INT_CST_LOW, TREE_TYPE, TYPE_SIZE_UNIT, TYPE_VECTOR_SUBPARTS(), vect_dr_aligned_if_peeled_dr_is(), vect_get_data_access_cost(), vect_relevant_for_alignment_p(), and vect_supportable_dr_alignment().
Referenced by vect_enhance_data_refs_alignment(), and vect_peeling_hash_get_lowest_cost().
| tree vect_get_smallest_scalar_type | ( | stmt_vec_info | stmt_info, |
| tree | scalar_type ) |
Return the smallest scalar part of STMT_INFO. This is used to determine the vectype of the stmt. We generally set the vectype according to the type of the result (lhs). For stmts whose result-type is different than the type of the arguments (e.g., demotion, promotion), vectype will be reset appropriately (later). Note that we have to visit the smallest datatype in this function, because that determines the VF. If the smallest datatype in the loop is present only as the rhs of a promotion operation - we'd miss it. Such a case, where a variable of this datatype does not appear in the lhs anywhere in the loop, can only occur if it's an invariant: e.g.: 'int_x = (int) short_inv', which we'd expect to have been optimized away by invariant motion. However, we cannot rely on invariant motion to always take invariants out of the loop, and so in the case of promotion we also have to check the rhs. LHS_SIZE_UNIT and RHS_SIZE_UNIT contain the sizes of the corresponding types.
References dyn_cast(), gimple_assign_cast_p(), gimple_assign_lhs(), gimple_assign_rhs1(), gimple_assign_rhs_code(), gimple_call_arg(), gimple_call_internal_fn(), gimple_call_internal_p(), gimple_call_num_args(), i, internal_fn_mask_index(), internal_fn_stored_value_index(), internal_load_fn_p(), internal_store_fn_p(), SIMD_CLONE_ARG_TYPE_VECTOR, simd_clone_call_p(), tree_fits_uhwi_p(), TREE_INT_CST_LOW, TREE_TYPE, and TYPE_SIZE_UNIT.
Referenced by vect_get_vector_types_for_stmt().
| bool vect_grouped_load_supported | ( | tree | vectype, |
| bool | single_element_p, | ||
| unsigned HOST_WIDE_INT | count ) |
Function vect_grouped_load_supported. COUNT is the size of the load group (the number of statements plus the number of gaps). SINGLE_ELEMENT_P is true if there is actually only one statement, with a gap of COUNT - 1. Returns true if a suitable permute exists.
References can_vec_perm_const_p(), count, dump_enabled_p(), dump_printf_loc(), exact_log2(), gcc_assert, GET_MODE_NUNITS(), i, maybe_gt, MSG_MISSED_OPTIMIZATION, pow2p_hwi(), TYPE_MODE, TYPE_VECTOR_SUBPARTS(), vect_location, and VECTOR_MODE_P.
Referenced by get_group_load_store_type(), and vect_analyze_loop_2().
Function vect_grouped_store_supported. Returns TRUE if interleave high and interleave low permutations are supported, and FALSE otherwise.
References can_vec_perm_const_p(), count, dump_enabled_p(), dump_printf(), dump_printf_loc(), exact_log2(), gcc_assert, GET_MODE_NUNITS(), i, data_reference::indices, MSG_MISSED_OPTIMIZATION, pow2p_hwi(), TYPE_MODE, vect_location, and VECTOR_MODE_P.
Referenced by get_group_load_store_type(), and vect_analyze_loop_2().
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Return true if load- or store-lanes optab OPTAB is implemented for COUNT vectors of type VECTYPE. NAME is the name of OPTAB. If it is implemented and ELSVALS is nonzero store the possible else values in the vector it points to.
References convert_optab_handler(), count, dump_enabled_p(), dump_printf_loc(), GET_MODE_BITSIZE(), GET_MODE_NAME, get_supported_else_vals(), int_mode_for_size(), internal_fn_else_index(), MSG_MISSED_OPTIMIZATION, MSG_NOTE, targetm, TYPE_MODE, and vect_location.
Referenced by vect_load_lanes_supported(), and vect_store_lanes_supported().
| internal_fn vect_load_lanes_supported | ( | tree | vectype, |
| unsigned HOST_WIDE_INT | count, | ||
| bool | masked_p, | ||
| vec< int > * | elsvals ) |
Return FN if vec_{masked_,mask_len_}load_lanes is available for COUNT vectors
of type VECTYPE. MASKED_P says whether the masked form is needed.
If it is available and ELSVALS is nonzero store the possible else values
in the vector it points to.
References count, and vect_lanes_optab_supported_p().
Referenced by check_load_store_for_partial_vectors(), vect_optimize_slp_pass::decide_masked_load_lanes(), get_group_load_store_type(), vect_analyze_loop_2(), vect_analyze_slp(), and vect_lower_load_permutations().
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Insert DDR into LOOP_VINFO list of ddrs that may alias and need to be tested at run-time. Return TRUE if DDR was successfully inserted. Return false if versioning is not supported.
References opt_result::failure_at(), LOOP_VINFO_LOOP, LOOP_VINFO_MAY_ALIAS_DDRS, optimize_loop_nest_for_speed_p(), runtime_alias_check_p(), opt_result::success(), and vect_location.
Referenced by vect_analyze_data_ref_dependence(), and vect_analyze_possibly_independent_ddr().
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Choose best peeling option by traversing peeling hash table and either choosing an option with the lowest cost (if cost model is enabled) or the option that aligns as many accesses as possible.
References _vect_peel_info::count, _vect_peel_info::dr_info, _vect_peel_extended_info::inside_cost, INT_MAX, LOOP_VINFO_LOOP, NULL, _vect_peel_extended_info::outside_cost, _vect_peel_extended_info::peel_info, unlimited_cost_model(), vect_peeling_hash_choose_best_peeling(), vect_peeling_hash_get_lowest_cost(), vect_peeling_hash_get_most_frequent(), and _vect_peel_extended_info::vinfo.
Referenced by vect_enhance_data_refs_alignment(), and vect_peeling_hash_choose_best_peeling().
| int vect_peeling_hash_get_lowest_cost | ( | _vect_peel_info ** | slot, |
| _vect_peel_extended_info * | min ) |
Traverse peeling hash table and calculate cost for each peeling option. Find the one with the lowest cost.
References _vect_peel_info::count, _vect_peel_info::dr_info, dyn_cast(), LOOP_VINFO_SCALAR_ITERATION_COST, _vect_peel_info::npeel, vect_get_known_peeling_cost(), and vect_get_peeling_costs_all_drs().
Referenced by vect_peeling_hash_choose_best_peeling().
| int vect_peeling_hash_get_most_frequent | ( | _vect_peel_info ** | slot, |
| _vect_peel_extended_info * | max ) |
Traverse peeling hash table to find peeling option that aligns maximum number of data accesses.
References _vect_peel_info::count, _vect_peel_info::dr_info, and _vect_peel_info::npeel.
Referenced by vect_peeling_hash_choose_best_peeling().
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Insert DR_INFO into peeling hash table with NPEEL as key.
References hash_table< Descriptor, Lazy, Allocator >::find(), hash_table< Descriptor, Lazy, Allocator >::find_slot(), LOOP_VINFO_LOOP, _vect_peel_info::npeel, unlimited_cost_model(), and VECT_MAX_COST.
Referenced by vect_enhance_data_refs_alignment().
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Return true if the new peeling NPEEL is supported.
References dr_info::dr, dr_vec_info::dr, dr_misalignment(), DR_MISALIGNMENT_UNKNOWN, DR_STEP, DR_TARGET_ALIGNMENT, dr_unaligned_unsupported, known_alignment_for_access_p(), vec_info::lookup_dr(), LOOP_VINFO_DATAREFS, dr_vec_info::stmt, STMT_VINFO_VECTYPE, TREE_INT_CST_LOW, vect_dr_aligned_if_peeled_dr_is(), vect_relevant_for_alignment_p(), and vect_supportable_dr_alignment().
Referenced by vect_enhance_data_refs_alignment().
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Function vect_permute_load_chain. Given a chain of interleaved loads in DR_CHAIN of LENGTH that must be a power of 2 or equal to 3, generate extract_even/odd stmts to reorder the input data correctly. Return the final references for loads in RESULT_CHAIN. E.g., LENGTH is 4 and the scalar type is short, i.e., VF is 8. The input is 4 vectors each containing 8 elements. We assign a number to each element, the input sequence is: 1st vec: 0 1 2 3 4 5 6 7 2nd vec: 8 9 10 11 12 13 14 15 3rd vec: 16 17 18 19 20 21 22 23 4th vec: 24 25 26 27 28 29 30 31 The output sequence should be: 1st vec: 0 4 8 12 16 20 24 28 2nd vec: 1 5 9 13 17 21 25 29 3rd vec: 2 6 10 14 18 22 26 30 4th vec: 3 7 11 15 19 23 27 31 i.e., the first output vector should contain the first elements of each interleaving group, etc. We use extract_even/odd instructions to create such output. The input of each extract_even/odd operation is two vectors 1st vec 2nd vec 0 1 2 3 4 5 6 7 and the output is the vector of extracted even/odd elements. The output of extract_even will be: 0 2 4 6 and of extract_odd: 1 3 5 7 The permutation is done in log LENGTH stages. In each stage extract_even and extract_odd stmts are created for each pair of vectors in DR_CHAIN in their order. In our example, E1: extract_even (1st vec, 2nd vec) E2: extract_odd (1st vec, 2nd vec) E3: extract_even (3rd vec, 4th vec) E4: extract_odd (3rd vec, 4th vec) The output for the first stage will be: E1: 0 2 4 6 8 10 12 14 E2: 1 3 5 7 9 11 13 15 E3: 16 18 20 22 24 26 28 30 E4: 17 19 21 23 25 27 29 31 In order to proceed and create the correct sequence for the next stage (or for the correct output, if the second stage is the last one, as in our example), we first put the output of extract_even operation and then the output of extract_odd in RESULT_CHAIN (which is then copied to DR_CHAIN). The input for the second stage is: 1st vec (E1): 0 2 4 6 8 10 12 14 2nd vec (E3): 16 18 20 22 24 26 28 30 3rd vec (E2): 1 3 5 7 9 11 13 15 4th vec (E4): 17 19 21 23 25 27 29 31 The output of the second stage: E1: 0 4 8 12 16 20 24 28 E2: 2 6 10 14 18 22 26 30 E3: 1 5 9 13 17 21 25 29 E4: 3 7 11 15 19 23 27 31 And RESULT_CHAIN after reordering: 1st vec (E1): 0 4 8 12 16 20 24 28 2nd vec (E3): 1 5 9 13 17 21 25 29 3rd vec (E2): 2 6 10 14 18 22 26 30 4th vec (E4): 3 7 11 15 19 23 27 31.
References exact_log2(), gcc_assert, gimple_build_assign(), i, make_temp_ssa_name(), NULL, pow2p_hwi(), STMT_VINFO_VECTYPE, poly_int< N, C >::to_constant(), TYPE_VECTOR_SUBPARTS(), vect_finish_stmt_generation(), and vect_gen_perm_mask_checked().
Referenced by vect_transform_grouped_load().
| void vect_permute_store_chain | ( | vec_info * | vinfo, |
| vec< tree > & | dr_chain, | ||
| unsigned int | length, | ||
| stmt_vec_info | stmt_info, | ||
| gimple_stmt_iterator * | gsi, | ||
| vec< tree > * | result_chain ) |
Function vect_permute_store_chain. Given a chain of interleaved stores in DR_CHAIN of LENGTH that must be a power of 2 or equal to 3, generate interleave_high/low stmts to reorder the data correctly for the stores. Return the final references for stores in RESULT_CHAIN. E.g., LENGTH is 4 and the scalar type is short, i.e., VF is 8. The input is 4 vectors each containing 8 elements. We assign a number to each element, the input sequence is: 1st vec: 0 1 2 3 4 5 6 7 2nd vec: 8 9 10 11 12 13 14 15 3rd vec: 16 17 18 19 20 21 22 23 4th vec: 24 25 26 27 28 29 30 31 The output sequence should be: 1st vec: 0 8 16 24 1 9 17 25 2nd vec: 2 10 18 26 3 11 19 27 3rd vec: 4 12 20 28 5 13 21 30 4th vec: 6 14 22 30 7 15 23 31 i.e., we interleave the contents of the four vectors in their order. We use interleave_high/low instructions to create such output. The input of each interleave_high/low operation is two vectors: 1st vec 2nd vec 0 1 2 3 4 5 6 7 the even elements of the result vector are obtained left-to-right from the high/low elements of the first vector. The odd elements of the result are obtained left-to-right from the high/low elements of the second vector. The output of interleave_high will be: 0 4 1 5 and of interleave_low: 2 6 3 7 The permutation is done in log LENGTH stages. In each stage interleave_high and interleave_low stmts are created for each pair of vectors in DR_CHAIN, where the first argument is taken from the first half of DR_CHAIN and the second argument from it's second half. In our example, I1: interleave_high (1st vec, 3rd vec) I2: interleave_low (1st vec, 3rd vec) I3: interleave_high (2nd vec, 4th vec) I4: interleave_low (2nd vec, 4th vec) The output for the first stage is: I1: 0 16 1 17 2 18 3 19 I2: 4 20 5 21 6 22 7 23 I3: 8 24 9 25 10 26 11 27 I4: 12 28 13 29 14 30 15 31 The output of the second stage, i.e. the final result is: I1: 0 8 16 24 1 9 17 25 I2: 2 10 18 26 3 11 19 27 I3: 4 12 20 28 5 13 21 30 I4: 6 14 22 30 7 15 23 31.
References exact_log2(), gcc_assert, gimple_build_assign(), i, data_reference::indices, make_temp_ssa_name(), NULL, pow2p_hwi(), STMT_VINFO_VECTYPE, poly_int< N, C >::to_constant(), TYPE_VECTOR_SUBPARTS(), vect_finish_stmt_generation(), and vect_gen_perm_mask_checked().
Referenced by vectorizable_store().
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Return true if we know that the order of vectorized DR_INFO_A and vectorized DR_INFO_B will be the same as the order of DR_INFO_A and DR_INFO_B. At least one of the accesses is a write.
References dr_vec_info::dr, DR_GROUP_FIRST_ELEMENT, DR_GROUP_NEXT_ELEMENT, DR_IS_READ, DR_IS_WRITE, DR_STEP, get_later_stmt(), integer_zerop(), dr_vec_info::stmt, STMT_VINFO_DATA_REF, and STMT_VINFO_GROUPED_ACCESS.
Referenced by vect_analyze_data_ref_dependence(), vect_prune_runtime_alias_test_list(), and vectorizable_with_step_bound_p().
| opt_result vect_prune_runtime_alias_test_list | ( | loop_vec_info | loop_vinfo | ) |
Function vect_prune_runtime_alias_test_list. Prune a list of ddrs to be tested at run-time by versioning for alias. Merge several alias checks into one if possible. Return FALSE if resulting list of ddrs is longer then allowed by PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS, otherwise return TRUE.
References hash_set< KeyId, Lazy, Traits >::add(), count, DDR_A, DDR_B, DDR_OBJECT_A, DDR_OBJECT_B, dependence_distance_ge_vf(), dr_vec_info::dr, DR_BASE_ADDRESS, DR_GROUP_FIRST_ELEMENT, dr_known_forward_stride_p(), DR_OFFSET, DR_REF, DR_STEP, dump_dec(), dump_enabled_p(), dump_printf(), dump_printf_loc(), DUMP_VECT_SCOPE, opt_result::failure_at(), FOR_EACH_VEC_ELT, get_later_stmt(), i, index_in_loop_nest(), known_eq, least_bit_hwi(), vec_info::lookup_dr(), loop_cost_model(), loop_depth(), LOOP_VINFO_CHECK_NONZERO, LOOP_VINFO_CHECK_UNEQUAL_ADDRS, LOOP_VINFO_COMP_ALIAS_DDRS, LOOP_VINFO_LOOP, LOOP_VINFO_LOOP_NEST, LOOP_VINFO_MAY_ALIAS_DDRS, LOOP_VINFO_NITERS, LOOP_VINFO_VECT_FACTOR, MSG_NOTE, loop::num, operand_equal_p(), poly_int_tree_p(), prune_runtime_alias_test_list(), dr_with_seg_len_pair_t::REORDERED, size_int, size_zero_node, dr_vec_info::stmt, STMT_VINFO_DR_INFO, opt_result::success(), TREE_CODE, vect_check_lower_bound(), vect_compile_time_alias(), VECT_COST_MODEL_CHEAP, VECT_COST_MODEL_VERY_CHEAP, vect_location, vect_preserves_scalar_order_p(), vect_small_gap_p(), vect_vfa_access_size(), vect_vfa_align(), vect_vfa_segment_size(), vectorizable_with_step_bound_p(), and dr_with_seg_len_pair_t::WELL_ORDERED.
Referenced by vect_analyze_loop_2().
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Record the base alignment guarantee given by DRB, which occurs in STMT_INFO.
References innermost_loop_behavior::base_address, innermost_loop_behavior::base_alignment, vec_info::base_alignments, innermost_loop_behavior::base_misalignment, dump_enabled_p(), dump_printf_loc(), hash_map< KeyId, Value, Traits >::get_or_insert(), MSG_NOTE, and vect_location.
Referenced by vect_record_base_alignments().
| void vect_record_base_alignments | ( | vec_info * | vinfo | ) |
If the region we're going to vectorize is reached, all unconditional data references occur at least once. We can therefore pool the base alignment guarantees from each unconditional reference. Do this by going through all the data references in VINFO and checking whether the containing statement makes the reference unconditionally. If so, record the alignment of the base address in VINFO so that it can be used for all other references with the same base.
References vec_info_shared::datarefs, DR_INNERMOST, DR_IS_CONDITIONAL_IN_STMT, dyn_cast(), vec_info::lookup_dr(), LOOP_VINFO_LOOP, nested_in_vect_loop_p(), NULL, vec_info::shared, STMT_VINFO_DR_WRT_VEC_LOOP, STMT_VINFO_GATHER_SCATTER_P, STMT_VINFO_VECTORIZABLE, and vect_record_base_alignment().
Referenced by vect_analyze_data_refs_alignment(), and vect_slp_analyze_bb_1().
| void vect_record_grouped_load_vectors | ( | vec_info * | , |
| stmt_vec_info | stmt_info, | ||
| vec< tree > | result_chain ) |
RESULT_CHAIN contains the output of a group of grouped loads that were generated as part of the vectorization of STMT_INFO. Assign the statement for each vector to the associated scalar statement.
References DR_GROUP_FIRST_ELEMENT, DR_GROUP_GAP, DR_GROUP_NEXT_ELEMENT, FOR_EACH_VEC_ELT, i, SSA_NAME_DEF_STMT, and STMT_VINFO_VEC_STMTS.
Referenced by vect_transform_grouped_load(), and vectorizable_load().
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Return true if alignment is relevant for DR_INFO.
References dr_info::dr, DR_GROUP_FIRST_ELEMENT, DR_STEP, integer_zerop(), STMT_VINFO_GATHER_SCATTER_P, STMT_VINFO_GROUPED_ACCESS, STMT_VINFO_RELEVANT_P, and STMT_VINFO_STRIDED_P.
Referenced by vect_enhance_data_refs_alignment(), vect_get_peeling_costs_all_drs(), and vect_peeling_supportable().
| tree vect_setup_realignment | ( | vec_info * | vinfo, |
| stmt_vec_info | stmt_info, | ||
| gimple_stmt_iterator * | gsi, | ||
| tree * | realignment_token, | ||
| enum dr_alignment_support | alignment_support_scheme, | ||
| tree | init_addr, | ||
| class loop ** | at_loop ) |
Function vect_setup_realignment
This function is called when vectorizing an unaligned load using
the dr_explicit_realign[_optimized] scheme.
This function generates the following code at the loop prolog:
p = initial_addr;
x msq_init = *(floor(p)); # prolog load
realignment_token = call target_builtin;
loop:
x msq = phi (msq_init, ---)
The stmts marked with x are generated only for the case of
dr_explicit_realign_optimized.
The code above sets up a new (vector) pointer, pointing to the first
location accessed by STMT_INFO, and a "floor-aligned" load using that
pointer. It also generates code to compute the "realignment-token"
(if the relevant target hook was defined), and creates a phi-node at the
loop-header bb whose arguments are the result of the prolog-load (created
by this function) and the result of a load that takes place in the loop
(to be created by the caller to this function).
For the case of dr_explicit_realign_optimized:
The caller to this function uses the phi-result (msq) to create the
realignment code inside the loop, and sets up the missing phi argument,
as follows:
loop:
msq = phi (msq_init, lsq)
lsq = *(floor(p')); # load in loop
result = realign_load (msq, lsq, realignment_token);
For the case of dr_explicit_realign:
loop:
msq = *(floor(p)); # load in loop
p' = p + (VS-1);
lsq = *(floor(p')); # load in loop
result = realign_load (msq, lsq, realignment_token);
Input:
STMT_INFO - (scalar) load stmt to be vectorized. This load accesses
a memory location that may be unaligned.
BSI - place where new code is to be inserted.
ALIGNMENT_SUPPORT_SCHEME - which of the two misalignment handling schemes
is used.
Output:
REALIGNMENT_TOKEN - the result of a call to the builtin_mask_for_load
target hook, if defined.
Return value - the result of the loop-header phi node.
References add_phi_arg(), build2(), build_int_cst(), copy_ssa_name(), create_phi_node(), dr_info::dr, dr_explicit_realign, dr_explicit_realign_optimized, DR_REF, DR_TARGET_ALIGNMENT, dyn_cast(), fold_build2, gcc_assert, get_virtual_phi(), gimple_assign_lhs(), gimple_assign_set_lhs(), gimple_bb(), gimple_build_assign(), gimple_build_call(), gimple_call_lhs(), gimple_call_return_type(), gimple_call_set_lhs(), gimple_set_vuse(), gimple_vuse(), gsi_insert_before(), gsi_insert_on_edge_immediate(), gsi_insert_seq_before(), gsi_insert_seq_on_edge_immediate(), GSI_SAME_STMT, gsi_stmt(), loop::header, loop::inner, loop_preheader_edge(), LOOP_VINFO_LOOP, make_ssa_name(), nested_in_vect_loop_p(), NULL, NULL_TREE, PHI_ARG_DEF_FROM_EDGE, reference_alias_ptr_type(), size_zero_node, STMT_VINFO_DR_INFO, STMT_VINFO_DR_STEP, STMT_VINFO_VECTYPE, targetm, TREE_CODE, tree_int_cst_compare(), TREE_READONLY, TREE_TYPE, UNKNOWN_LOCATION, vect_copy_ref_info(), vect_create_addr_base_for_vector_ref(), vect_create_data_ref_ptr(), and vect_create_destination_var().
Referenced by vectorizable_load().
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Function vect_shift_permute_load_chain.
Given a chain of loads in DR_CHAIN of LENGTH 2 or 3, generate
sequence of stmts to reorder the input data accordingly.
Return the final references for loads in RESULT_CHAIN.
Return true if successed, false otherwise.
E.g., LENGTH is 3 and the scalar type is short, i.e., VF is 8.
The input is 3 vectors each containing 8 elements. We assign a
number to each element, the input sequence is:
1st vec: 0 1 2 3 4 5 6 7
2nd vec: 8 9 10 11 12 13 14 15
3rd vec: 16 17 18 19 20 21 22 23
The output sequence should be:
1st vec: 0 3 6 9 12 15 18 21
2nd vec: 1 4 7 10 13 16 19 22
3rd vec: 2 5 8 11 14 17 20 23
We use 3 shuffle instructions and 3 * 3 - 1 shifts to create such output.
First we shuffle all 3 vectors to get correct elements order:
1st vec: ( 0 3 6) ( 1 4 7) ( 2 5)
2nd vec: ( 8 11 14) ( 9 12 15) (10 13)
3rd vec: (16 19 22) (17 20 23) (18 21)
Next we unite and shift vector 3 times:
1st step:
shift right by 6 the concatenation of:
"1st vec" and "2nd vec"
( 0 3 6) ( 1 4 7) |( 2 5) _ ( 8 11 14) ( 9 12 15)| (10 13)
"2nd vec" and "3rd vec"
( 8 11 14) ( 9 12 15) |(10 13) _ (16 19 22) (17 20 23)| (18 21)
"3rd vec" and "1st vec"
(16 19 22) (17 20 23) |(18 21) _ ( 0 3 6) ( 1 4 7)| ( 2 5)
| New vectors |
So that now new vectors are:
1st vec: ( 2 5) ( 8 11 14) ( 9 12 15)
2nd vec: (10 13) (16 19 22) (17 20 23)
3rd vec: (18 21) ( 0 3 6) ( 1 4 7)
2nd step:
shift right by 5 the concatenation of:
"1st vec" and "3rd vec"
( 2 5) ( 8 11 14) |( 9 12 15) _ (18 21) ( 0 3 6)| ( 1 4 7)
"2nd vec" and "1st vec"
(10 13) (16 19 22) |(17 20 23) _ ( 2 5) ( 8 11 14)| ( 9 12 15)
"3rd vec" and "2nd vec"
(18 21) ( 0 3 6) |( 1 4 7) _ (10 13) (16 19 22)| (17 20 23)
| New vectors |
So that now new vectors are:
1st vec: ( 9 12 15) (18 21) ( 0 3 6)
2nd vec: (17 20 23) ( 2 5) ( 8 11 14)
3rd vec: ( 1 4 7) (10 13) (16 19 22) READY
3rd step:
shift right by 5 the concatenation of:
"1st vec" and "1st vec"
( 9 12 15) (18 21) |( 0 3 6) _ ( 9 12 15) (18 21)| ( 0 3 6)
shift right by 3 the concatenation of:
"2nd vec" and "2nd vec"
(17 20 23) |( 2 5) ( 8 11 14) _ (17 20 23)| ( 2 5) ( 8 11 14)
| New vectors |
So that now all vectors are READY:
1st vec: ( 0 3 6) ( 9 12 15) (18 21)
2nd vec: ( 2 5) ( 8 11 14) (17 20 23)
3rd vec: ( 1 4 7) (10 13) (16 19 22)
This algorithm is faster than one in vect_permute_load_chain if:
1. "shift of a concatination" is faster than general permutation.
This is usually so.
2. The TARGET machine can't execute vector instructions in parallel.
This is because each step of the algorithm depends on previous.
The algorithm in vect_permute_load_chain is much more parallel.
The algorithm is applicable only for LOAD CHAIN LENGTH less than VF.
References can_vec_perm_const_p(), dump_enabled_p(), dump_printf_loc(), dyn_cast(), exact_log2(), gimple_build_assign(), i, LOOP_VINFO_VECT_FACTOR, make_temp_ssa_name(), MSG_MISSED_OPTIMIZATION, NULL, pow2p_hwi(), STMT_VINFO_VECTYPE, TYPE_MODE, TYPE_VECTOR_SUBPARTS(), vect_finish_stmt_generation(), vect_gen_perm_mask_checked(), and vect_location.
Referenced by vect_transform_grouped_load().
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Function vect_slp_analyze_data_ref_dependence. Return TRUE if there (might) exist a dependence between a memory-reference DRA and a memory-reference DRB for VINFO. When versioning for alias may check a dependence at run-time, return FALSE. Adjust *MAX_VF according to the data dependence.
References chrec_dont_know, chrec_known, DDR_A, DDR_ARE_DEPENDENT, DDR_B, DR_GROUP_FIRST_ELEMENT, DR_IS_READ, DR_REF, dump_enabled_p(), dump_printf_loc(), vec_info::lookup_dr(), MSG_MISSED_OPTIMIZATION, MSG_NOTE, dr_vec_info::stmt, STMT_VINFO_GROUPED_ACCESS, and vect_location.
Referenced by vect_slp_analyze_load_dependences(), and vect_slp_analyze_store_dependences().
| bool vect_slp_analyze_instance_alignment | ( | vec_info * | vinfo, |
| slp_instance | instance ) |
Function vect_slp_analyze_instance_alignment Analyze the alignment of the data-references in the SLP instance. Return FALSE if a data reference is found that cannot be vectorized.
References DUMP_VECT_SCOPE, FOR_EACH_VEC_ELT, i, slp_inst_kind_store, SLP_INSTANCE_KIND, SLP_INSTANCE_LOADS, SLP_INSTANCE_TREE, and vect_slp_analyze_node_alignment().
Referenced by vect_slp_analyze_bb_1().
| bool vect_slp_analyze_instance_dependence | ( | vec_info * | vinfo, |
| slp_instance | instance ) |
Function vect_analyze_data_ref_dependences. Examine all the data references in the basic-block, and make sure there do not exist any data dependences between them. Set *MAX_VF according to the maximum vectorization factor the data dependences allow.
References absu_hwi(), create_data_ref(), DR_BASE_ADDRESS, DR_GROUP_FIRST_ELEMENT, DR_GROUP_SIZE, DR_INIT, DR_OFFSET, DR_REF, DR_STEP, DUMP_VECT_SCOPE, free_data_ref(), gimple_bb(), gimple_set_visited(), basic_block_def::loop_father, loop_outer(), loop_preheader_edge(), maybe_gt, NULL, operand_equal_p(), ranges_overlap_p(), slp_inst_kind_store, SLP_INSTANCE_KIND, SLP_INSTANCE_LOADS, SLP_INSTANCE_TREE, SLP_TREE_SCALAR_STMTS, SLP_TREE_VECTYPE, data_reference::stmt, STMT_VINFO_DATA_REF, STMT_VINFO_GROUPED_ACCESS, STMT_VINFO_STMT, TREE_CODE, TREE_INT_CST_LOW, tree_to_poly_uint64(), TREE_TYPE, TYPE_SIZE_UNIT, vect_find_last_scalar_stmt_in_slp(), vect_slp_analyze_load_dependences(), vect_slp_analyze_store_dependences(), vect_stmt_dominates_stmt_p(), and vNULL.
Referenced by vect_slp_analyze_bb_1().
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Analyze dependences involved in the transform of a load SLP NODE. STORES contain the vector of scalar stores of this instance if we are disambiguating the loads.
References hash_set< KeyId, Lazy, Traits >::add(), ao_ref_init(), DR_GROUP_FIRST_ELEMENT, DR_GROUP_NEXT_ELEMENT, DR_IS_READ, DR_REF, free_dependence_relation(), gcc_assert, get_later_stmt(), gimple_vdef(), gimple_visited_p(), gsi_for_stmt(), gsi_prev(), gsi_stmt(), initialize_data_dependence_relation(), vec_info::lookup_stmt(), NULL, data_reference::ref, SLP_TREE_SCALAR_STMTS, data_reference::stmt, stmt_may_clobber_ref_p_1(), STMT_VINFO_DATA_REF, STMT_VINFO_GROUPED_ACCESS, vect_find_first_scalar_stmt_in_slp(), vect_orig_stmt(), vect_slp_analyze_data_ref_dependence(), and vNULL.
Referenced by vect_slp_analyze_instance_dependence().
Analyze alignment of DRs of stmts in NODE.
References DR_GROUP_FIRST_ELEMENT, DR_MISALIGNMENT_UNINITIALIZED, DR_MISALIGNMENT_UNKNOWN, known_lt, SLP_TREE_SCALAR_STMTS, SLP_TREE_VECTYPE, STMT_VINFO_DR_INFO, targetm, and vect_compute_data_ref_alignment().
Referenced by vect_slp_analyze_instance_alignment().
Analyze dependences involved in the transform of a store SLP NODE.
References ao_ref_init(), DR_IS_WRITE, DR_REF, free_dependence_relation(), gcc_assert, gimple_visited_p(), gimple_vuse(), gsi_for_stmt(), gsi_next(), gsi_stmt(), initialize_data_dependence_relation(), vec_info::lookup_stmt(), data_reference::ref, ref_maybe_used_by_stmt_p(), SLP_TREE_SCALAR_STMTS, data_reference::stmt, stmt_may_clobber_ref_p_1(), STMT_VINFO_DATA_REF, vect_find_last_scalar_stmt_in_slp(), vect_orig_stmt(), vect_slp_analyze_data_ref_dependence(), and vNULL.
Referenced by vect_slp_analyze_instance_dependence().
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Return true if it's unlikely that the step of the vectorized form of DR_INFO will span fewer than GAP bytes.
References count, DR_GROUP_FIRST_ELEMENT, DR_GROUP_SIZE, estimated_poly_value(), LOOP_VINFO_VECT_FACTOR, and vect_get_scalar_dr_size().
Referenced by vect_prune_runtime_alias_test_list().
| internal_fn vect_store_lanes_supported | ( | tree | vectype, |
| unsigned HOST_WIDE_INT | count, | ||
| bool | masked_p ) |
Return FN if vec_{mask_,mask_len_}store_lanes is available for COUNT vectors
of type VECTYPE. MASKED_P says whether the masked form is needed.
References count, and vect_lanes_optab_supported_p().
Referenced by check_load_store_for_partial_vectors(), get_group_load_store_type(), vect_analyze_loop_2(), vect_analyze_slp(), vect_build_slp_instance(), and vect_slp_prefer_store_lanes_p().
| enum dr_alignment_support vect_supportable_dr_alignment | ( | vec_info * | vinfo, |
| dr_vec_info * | dr_info, | ||
| tree | vectype, | ||
| int | misalignment ) |
Return whether the data reference DR_INFO is supported with respect to its alignment. If CHECK_ALIGNED_ACCESSES is TRUE, check if the access is supported even it is aligned, i.e., check if it is possible to vectorize it with different alignment.
References can_implement_p(), dr_info::dr, dr_aligned, dr_explicit_realign, dr_explicit_realign_optimized, DR_GROUP_FIRST_ELEMENT, DR_GROUP_SIZE, DR_IS_READ, DR_MISALIGNMENT_UNKNOWN, DR_REF, dr_safe_speculative_read_required(), DR_STEP, dr_unaligned_supported, dr_unaligned_unsupported, dyn_cast(), GET_MODE_SIZE(), gimple_call_internal_fn(), gimple_call_internal_p(), LOOP_VINFO_LOOP, LOOP_VINFO_VECT_FACTOR, nested_in_vect_loop_p(), not_size_aligned(), NULL, STMT_SLP_TYPE, STMT_VINFO_GROUPED_ACCESS, targetm, TREE_INT_CST_LOW, TREE_TYPE, TYPE_MODE, and TYPE_VECTOR_SUBPARTS().
Referenced by get_group_load_store_type(), get_load_store_type(), get_negative_load_store_type(), vect_enhance_data_refs_alignment(), vect_get_peeling_costs_all_drs(), vect_peeling_supportable(), vect_vfa_access_size(), vectorizable_load(), and vectorizable_store().
| void vect_transform_grouped_load | ( | vec_info * | vinfo, |
| stmt_vec_info | stmt_info, | ||
| vec< tree > | dr_chain, | ||
| int | size, | ||
| gimple_stmt_iterator * | gsi ) |
Function vect_transform_grouped_load. Given a chain of input interleaved data-refs (in DR_CHAIN), build statements to perform their permutation and ascribe the result vectorized statements to the scalar statements.
References pow2p_hwi(), STMT_VINFO_VECTYPE, targetm, TYPE_MODE, vect_permute_load_chain(), vect_record_grouped_load_vectors(), vect_shift_permute_load_chain(), and vNULL.
Referenced by vectorizable_load().
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Function vect_update_misalignment_for_peel.
Sets DR_INFO's misalignment
- to 0 if it has the same alignment as DR_PEEL_INFO,
- to the misalignment computed using NPEEL if DR_INFO's salignment is known,
- to -1 (unknown) otherwise.
DR_INFO - the data reference whose misalignment is to be adjusted.
DR_PEEL_INFO - the data reference whose misalignment is being made
zero in the vector loop by the peel.
NPEEL - the number of iterations in the peel loop if the misalignment
of DR_PEEL_INFO is known at compile time.
References dr_info::dr, DR_MISALIGNMENT_UNKNOWN, DR_STEP, DR_TARGET_ALIGNMENT, dump_enabled_p(), dump_printf_loc(), known_alignment_for_access_p(), MSG_NOTE, SET_DR_MISALIGNMENT, set_dr_misalignment(), dr_vec_info::stmt, STMT_VINFO_VECTYPE, TREE_INT_CST_LOW, vect_dr_aligned_if_peeled_dr_is(), vect_dr_misalign_for_aligned_access(), and vect_location.
Referenced by vect_enhance_data_refs_alignment().
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Return a value that, when added to abs (vect_vfa_segment_size (DR_INFO)), gives the worst-case number of bytes covered by the segment.
References dr_info::dr, dr_explicit_realign_optimized, DR_GROUP_FIRST_ELEMENT, DR_GROUP_GAP, DR_GROUP_SIZE, dr_misalignment(), DR_REF, gcc_assert, STMT_VINFO_VEC_STMTS, STMT_VINFO_VECTYPE, tree_to_uhwi(), TREE_TYPE, TYPE_SIZE_UNIT, and vect_supportable_dr_alignment().
Referenced by vect_prune_runtime_alias_test_list().
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Get the minimum alignment for all the scalar accesses that DR_INFO describes.
References dr_info::dr, and dr_alignment().
Referenced by vect_prune_runtime_alias_test_list().
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Function vect_vfa_segment_size. Input: DR_INFO: The data reference. LENGTH_FACTOR: segment length to consider. Return a value suitable for the dr_with_seg_len::seg_len field. This is the "distance travelled" by the pointer from the first iteration in the segment to the last. Note that it does not include the size of the access; in effect it only describes the first byte.
References dr_info::dr, DR_STEP, fold_convert, size_binop, size_one_node, and sizetype.
Referenced by vect_prune_runtime_alias_test_list().
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Function vector_alignment_reachable_p Return true if vector alignment for DR_INFO is reachable by peeling a few loop iterations. Return false otherwise.
References aligned_access_p(), dr_info::dr, DR_GROUP_FIRST_ELEMENT, DR_GROUP_SIZE, dr_misalignment(), DR_REF, dr_target_alignment(), dump_enabled_p(), dump_printf_loc(), GET_MODE_SIZE(), int_cst_value(), known_alignment_for_access_p(), MSG_MISSED_OPTIMIZATION, MSG_NOTE, not_size_aligned(), STMT_VINFO_GROUPED_ACCESS, STMT_VINFO_VECTYPE, targetm, TREE_TYPE, TYPE_MODE, TYPE_SIZE_UNIT, TYPE_VECTOR_SUBPARTS(), vect_location, and vector_element_size.
Referenced by vect_enhance_data_refs_alignment().
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Return true if we know that there is no alias between DR_INFO_A and DR_INFO_B when abs (DR_STEP (DR_INFO_A->dr)) >= N for some N. When returning true, set *LOWER_BOUND_OUT to this N.
References dr_vec_info::dr, DR_BASE_ADDRESS, DR_INIT, DR_OFFSET, DR_STEP, maybe_gt, operand_equal_p(), poly_int_tree_p(), vect_get_scalar_dr_size(), and vect_preserves_scalar_order_p().
Referenced by vect_prune_runtime_alias_test_list().
1.13.2