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Add predicate likelihood macros.

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Define the couple of standard macros that we can use to guide gcc
optimisations of which code path will be most likely taken.
This commit is contained in:
Chris Wilson 2008-11-13 11:13:22 +00:00
parent b06c50cc54
commit 0769d39d00
1 changed files with 17 additions and 0 deletions
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17
src/cairo-compiler-private.h
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@ -139,6 +139,23 @@
#define cairo_const
#endif
#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
#define _CAIRO_BOOLEAN_EXPR(expr) \
__extension__ ({ \
int _cairo_boolean_var_; \
if (expr) \
_cairo_boolean_var_ = 1; \
else \
_cairo_boolean_var_ = 0; \
_cairo_boolean_var_; \
})
#define _cairo_likely(expr) (__builtin_expect (_CAIRO_BOOLEAN_EXPR(expr), 1))
#define _cairo_unlikely(expr) (__builtin_expect (_CAIRO_BOOLEAN_EXPR(expr), 0))
#else
#define _cairo_likely(expr) (expr)
#define _cairo_unlikely(expr) (expr)
#endif
#ifndef __GNUC__
#undef __attribute__
#define __attribute__(x)