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| author | Jan Hubicka <jh@suse.cz> | 2023-08-06 22:53:14 +0200 |
|---|---|---|
| committer | Jan Hubicka <jh@suse.cz> | 2023-08-06 22:53:14 +0200 |
| commit | 1fc96cdd0a3df2ba90a04dc507a44a02fbebd1f3 (patch) | |
| tree | 19547a245d9e4e3c399c8db9b0c5bf66d8479c91 | |
| parent | e3e6db43640fadc9aa41c5459d43e5541d83f29a (diff) | |
| download | gcc-1fc96cdd0a3df2ba90a04dc507a44a02fbebd1f3.zip gcc-1fc96cdd0a3df2ba90a04dc507a44a02fbebd1f3.tar.gz gcc-1fc96cdd0a3df2ba90a04dc507a44a02fbebd1f3.tar.bz2 | |
Add builtin_expect to predict that CPU supports cpuid to cpuid.h
This is needed to avoid impossible threading update in vectorizer testcase,
but should also reflect reality on most CPUs we care about.
gcc/ChangeLog:
* config/i386/cpuid.h (__get_cpuid_count, __get_cpuid_max): Add
__builtin_expect that CPU likely supports cpuid.
| -rw-r--r-- | gcc/config/i386/cpuid.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/config/i386/cpuid.h b/gcc/config/i386/cpuid.h index 03fd6fc..73c1548 100644 --- a/gcc/config/i386/cpuid.h +++ b/gcc/config/i386/cpuid.h @@ -295,7 +295,7 @@ __get_cpuid_max (unsigned int __ext, unsigned int *__sig) : "i" (0x00200000)); #endif - if (!((__eax ^ __ebx) & 0x00200000)) + if (__builtin_expect (!((__eax ^ __ebx) & 0x00200000), 0)) return 0; #endif @@ -338,7 +338,7 @@ __get_cpuid_count (unsigned int __leaf, unsigned int __subleaf, unsigned int __ext = __leaf & 0x80000000; unsigned int __maxlevel = __get_cpuid_max (__ext, 0); - if (__maxlevel == 0 || __maxlevel < __leaf) + if (__builtin_expect (__maxlevel == 0, 0) || __maxlevel < __leaf) return 0; __cpuid_count (__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx); |