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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 08:28:01 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 08:28:13 -0700 |
| commit | 9cd30491dd6d9d4c5e9372d7a5c75f78f3a11260 (patch) | |
| tree | 9bdc9658b03a2c6038871f6b19eff9838379c382 /sysdeps/x86_64 | |
| parent | 30cb625a21bc7ad450fdc45d1f682e2b27c353de (diff) | |
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x86: Add macros to implement ifunce selection in C
These macros are used to implement ifunc selection in C. To implement
an ifunc function, foo, which returns the address of __foo_sse2 or
__foo_avx2:
__foo_avx2:
#define foo __redirect_foo
#define __foo __redirect___foo
#include <foo.h>
#undef foo
#undef __foo
#define SYMBOL_NAME foo
#include <init-arch.h>
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
static inline void *
foo_selector (void)
{
if (use AVX2)
return OPTIMIZE (avx2);
return OPTIMIZE (sse2);
}
libc_ifunc_redirected (__redirect_foo, foo, foo_selector ());
* sysdeps/x86/init-arch.h (PASTER1): New.
(EVALUATOR1): Likewise.
(PASTER2): Likewise.
(EVALUATOR2): Likewise.
(REDIRECT_NAME): Likewise.
(OPTIMIZE): Likewise.
(IFUNC_SELECTOR): Likewise.
Diffstat (limited to 'sysdeps/x86_64')
0 files changed, 0 insertions, 0 deletions