diff options
| author | Matt Turner <[email protected]> | 2014-11-21 13:50:14 -0800 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2014-11-24 14:09:23 -0800 |
| commit | 99cebffda9cd2d42edd6c1cbeceb994e6b320c5a (patch) | |
| tree | cc3cdae0a5a860cc9b514ea18c83dc4b66bc53cd /src/util | |
| parent | 56ac25918aea37a3c2c52f99fc285f2475be9128 (diff) | |
util: Implement assume() for clang.
Reviewed-by: Jordan Justen <[email protected]>
Diffstat (limited to 'src/util')
| -rw-r--r-- | src/util/macros.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/util/macros.h b/src/util/macros.h index da5daff9bf8..5fc6729536c 100644 --- a/src/util/macros.h +++ b/src/util/macros.h @@ -29,6 +29,10 @@ # define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x))) #endif +/* For compatibility with Clang's __has_builtin() */ +#ifndef __has_builtin +# define __has_builtin(x) 0 +#endif /** * __builtin_expect macros @@ -85,7 +89,13 @@ do { \ * Assume macro. Useful for expressing our assumptions to the compiler, * typically for purposes of silencing warnings. */ -#ifdef HAVE___BUILTIN_UNREACHABLE +#if __has_builtin(__builtin_assume) +#define assume(expr) \ +do { \ + assert(expr); \ + __builtin_assume(expr); \ +} while (0) +#elif defined HAVE___BUILTIN_UNREACHABLE #define assume(expr) ((expr) ? ((void) 0) \ : (assert(!"assumption failed"), \ __builtin_unreachable())) |