inchash.h File Reference

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Data Structures
class	inchash::hash

Namespaces
namespace	inchash

Macros
#define	mix(a, b, c)

Functions
hashval_t	iterative_hash_host_wide_int (HOST_WIDE_INT, hashval_t)
hashval_t	iterative_hash_hashval_t (hashval_t, hashval_t)

Macro Definition Documentation

mix

#define mix	(		a,
			b,
			c )

Value:

{ \
  a -= b; a -= c; a ^= (c>>13); \
  b -= c; b -= a; b ^= (a<< 8); \
  c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
  a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
  b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
  c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
  a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
  b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
  c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
}

Borrowed from hashtab.c iterative_hash implementation.   

Referenced by iterative_hash_hashval_t(), and iterative_hash_host_wide_int().

Function Documentation

iterative_hash_hashval_t()

hashval_t iterative_hash_hashval_t ( hashval_t val, hashval_t val2 )

inline

Produce good hash value combining VAL and VAL2.   

References a, ggc_alloc(), and mix.

Referenced by inchash::hash::add_int(), pair_hash< T1, T2 >::hash(), DFS::hash_scc(), iterative_hash_host_wide_int(), and inchash::hash::merge_hash().

iterative_hash_host_wide_int()

hashval_t iterative_hash_host_wide_int ( HOST_WIDE_INT val, hashval_t val2 )

inline

An incremental hash abstract data type.
   Copyright (C) 2014-2024 Free Software Foundation, Inc.

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/>.   

This file implements an incremential hash function ADT, to be used
by code that incrementially hashes a lot of unrelated data
(not in a single memory block) into a single value. The goal
is to make it easy to plug in efficient hash algorithms.
Currently it just implements the plain old jhash based
incremental hash from gcc's tree.cc.   

Produce good hash value combining VAL and VAL2.   

References a, b, ggc_alloc(), iterative_hash_hashval_t(), and mix.

Referenced by inchash::hash::add_hwi(), gather_mem_refs_stmt(), int_cst_hasher::hash(), and ipa_icf::sem_function::init().