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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.
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| .. | ||
| bits | ||
| fpu | ||
| nptl/bits | ||
| cacheinfo.c | ||
| cpu-features-offsets.sym | ||
| cpu-features.c | ||
| cpu-features.h | ||
| dl-get-cpu-features.c | ||
| dl-hwcap.h | ||
| dl-procinfo.c | ||
| dl-procinfo.h | ||
| elide.h | ||
| fpu_control.h | ||
| init-arch.h | ||
| libc-start.c | ||
| linkmap.h | ||
| Makefile | ||
| string_private.h | ||
| tininess.h | ||
| tst-get-cpu-features-static.c | ||
| tst-get-cpu-features.c | ||
| Versions | ||