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InnoDB: Define some macros around GCC's __builtin_expect()

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and __builtin_prefetch().
Add UNIV_LIKELY_NULL to if (heap) mem_free_heap(heap) tests.
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marko@hundin.mysql.fi 2005-04-21 14:23:26 +03:00
commit c470116981
16 changed files with 82 additions and 68 deletions
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14
innobase/include/univ.i
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@ -243,6 +243,20 @@ contains the sum of the following flag and the locally stored len. */
#define UNIV_EXTERN_STORAGE_FIELD (UNIV_SQL_NULL - UNIV_PAGE_SIZE)
#if defined(__GNUC__) && (__GNUC__ > 2)
# define UNIV_EXPECT(expr,value) __builtin_expect(expr, value)
# define UNIV_LIKELY_NULL(expr) __builtin_expect((ulint) expr, 0)
# define UNIV_PREFETCH_R(addr) __builtin_prefetch(addr, 0, 3)
# define UNIV_PREFETCH_RW(addr) __builtin_prefetch(addr, 1, 3)
#else
# define UNIV_EXPECT(expr,value) (expr)
# define UNIV_LIKELY_NULL(expr) (expr)
# define UNIV_PREFETCH_R(addr) ((void) 0)
# define UNIV_PREFETCH_RW(addr) ((void) 0)
#endif
#define UNIV_LIKELY(expr) UNIV_EXPECT(expr, TRUE)
#define UNIV_UNLIKELY(expr) UNIV_EXPECT(expr, FALSE)
#include <stdio.h>
#include "ut0dbg.h"
#include "ut0ut.h"