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Make our allocator slightly faster with branch hinting.

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This commit is contained in:
Dale Weiler 2013-08-15 06:09:28 +00:00
parent 91c7209146
commit 7df42c95d2
2 changed files with 21 additions and 8 deletions
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8
gmqcc.h
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@ -149,6 +149,14 @@ GMQCC_IND_STRING(GMQCC_VERSION_PATCH) \
# define GMQCC_NORETURN
#endif /*! (defined(__GNUC__) && __GNUC__ >= 2) || defined (__CLANG__) */
#if (defined(__GNUC__)) || defined(__CLANG__)
# define GMQCC_LIKELY(X) __builtin_expect((X), 1)
# define GMQCC_UNLIKELY(X) __builtin_expect((X), 0)
#else
# define GMQCC_LIKELY(X) (X)
# define GMQCC_UNLIKELY(X) (X)
#endif
#ifndef _MSC_VER
# include <stdint.h>
#else

21
stat.c
View file

@ -107,7 +107,7 @@ void *stat_mem_allocate(size_t size, size_t line, const char *file) {
stat_mem_block_t *info = (stat_mem_block_t*)malloc(sizeof(stat_mem_block_t) + size);
void *data = (void*)(info + 1);
if(!info)
if(GMQCC_UNLIKELY(!info))
return NULL;
info->line = line;
@ -116,7 +116,8 @@ void *stat_mem_allocate(size_t size, size_t line, const char *file) {
info->prev = NULL;
info->next = stat_mem_block_root;
if (stat_mem_block_root)
/* unlikely since it only happens once */
if (GMQCC_UNLIKELY(stat_mem_block_root != NULL))
stat_mem_block_root->prev = info;
stat_mem_block_root = info;
@ -133,7 +134,7 @@ void *stat_mem_allocate(size_t size, size_t line, const char *file) {
void stat_mem_deallocate(void *ptr) {
stat_mem_block_t *info = NULL;
if (!ptr)
if (GMQCC_UNLIKELY(!ptr))
return;
info = ((stat_mem_block_t*)ptr - 1);
@ -156,11 +157,11 @@ void *stat_mem_reallocate(void *ptr, size_t size, size_t line, const char *file)
stat_mem_block_t *oldinfo = NULL;
stat_mem_block_t *newinfo;
if (!ptr)
if (GMQCC_UNLIKELY(!ptr))
return stat_mem_allocate(size, line, file);
/* stay consistent with glic */
if (!size) {
/* stay consistent with glibc */
if (GMQCC_UNLIKELY(!size)) {
stat_mem_deallocate(ptr);
return NULL;
}
@ -168,7 +169,7 @@ void *stat_mem_reallocate(void *ptr, size_t size, size_t line, const char *file)
oldinfo = ((stat_mem_block_t*)ptr - 1);
newinfo = ((stat_mem_block_t*)malloc(sizeof(stat_mem_block_t) + size));
if (!newinfo) {
if (GMQCC_UNLIKELY(!newinfo)) {
stat_mem_deallocate(ptr);
return NULL;
}
@ -188,7 +189,11 @@ void *stat_mem_reallocate(void *ptr, size_t size, size_t line, const char *file)
newinfo->prev = NULL;
newinfo->next = stat_mem_block_root;
if (stat_mem_block_root)
/*
* likely since the only time there is no root is when it's
* being initialized first.
*/
if (GMQCC_LIKELY(stat_mem_block_root != NULL))
stat_mem_block_root->prev = newinfo;
stat_mem_block_root = newinfo;