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author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 08:28:01 -0700 |
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committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 08:28:13 -0700 |
commit | 9cd30491dd6d9d4c5e9372d7a5c75f78f3a11260 (patch) | |
tree | 9bdc9658b03a2c6038871f6b19eff9838379c382 /sysdeps/x86_64/fpu | |
parent | 30cb625a21bc7ad450fdc45d1f682e2b27c353de (diff) | |
download | glibc-9cd30491dd6d9d4c5e9372d7a5c75f78f3a11260.tar.gz glibc-9cd30491dd6d9d4c5e9372d7a5c75f78f3a11260.tar.xz glibc-9cd30491dd6d9d4c5e9372d7a5c75f78f3a11260.zip |
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/fpu')
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