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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-08-18 07:59:49 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-08-18 08:00:00 -0700 |
| commit | 1814df5b02b9c359052c2048a1d2d617b406a17a (patch) | |
| tree | 30f5786d3e53d6043ecaab75bdb71cddf6567368 | |
| parent | 441c3b59d1e2fca4ad40cf53d03d6196c978e85f (diff) | |
| download | glibc-1814df5b02b9c359052c2048a1d2d617b406a17a.tar.gz glibc-1814df5b02b9c359052c2048a1d2d617b406a17a.tar.xz glibc-1814df5b02b9c359052c2048a1d2d617b406a17a.zip | |
Define HAS_CPUID/HAS_I586/HAS_I686 from -march=
cpuid, i586 and i686 instructions are available if the processor specified by -march= supports them. We can use this information to determine whether those instructions can be used safely. * sysdeps/x86/cpu-features.c (init_cpu_features): Check whether cpuid is available only if HAS_CPUID is 0. * sysdeps/x86/cpu-features.h (HAS_CPUID): New. (HAS_I586): Likewise. (HAS_I686): Likewise.
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 4 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 27 |
3 files changed, 37 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog index 298bd22941..db5d483180 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2015-08-18 H.J. Lu <hongjiu.lu@intel.com> + + * sysdeps/x86/cpu-features.c (init_cpu_features): Check + whether cpuid is available only if HAS_CPUID is 0. + * sysdeps/x86/cpu-features.h (HAS_CPUID): New. + (HAS_I586): Likewise. + (HAS_I686): Likewise. + 2015-08-18 Marko Myllynen <myllynen@redhat.com> [BZ #16973] diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 582a8f5f79..40575de611 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -40,7 +40,7 @@ init_cpu_features (struct cpu_features *cpu_features) unsigned int model = 0; enum cpu_features_kind kind; -#if !defined __i586__ && !defined __i686__ && !defined __x86_64__ +#if !HAS_CPUID if (__get_cpuid_max (0, 0) == 0) { kind = arch_kind_other; @@ -204,7 +204,7 @@ init_cpu_features (struct cpu_features *cpu_features) } } -#if !defined __i586__ && !defined __i686__ && !defined __x86_64__ +#if !HAS_CPUID no_cpuid: #endif diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index 22e5abb919..6b8299f125 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -237,4 +237,31 @@ extern const struct cpu_features *__get_cpu_features (void) #endif /* !__ASSEMBLER__ */ +#ifdef __x86_64__ +# define HAS_CPUID 1 +#elif defined __pentium__ +# define HAS_CPUID 1 +# define HAS_I586 1 +# define HAS_I686 0 +#elif (defined __pentiumpro__ || defined __pentium4__ \ + || defined __nocona__ || defined __atom__ \ + || defined __core2__ || defined __corei7__ \ + || defined __corei7_avx__ || defined __core_avx2__ \ + || defined __nehalem__ || defined __sandybridge__ \ + || defined __haswell__ || defined __knl__ \ + || defined __bonnell__ || defined __silvermont__ \ + || defined __k6__ || defined __k8__ \ + || defined __athlon__ || defined __amdfam10__ \ + || defined __bdver1__ || defined __bdver2__ \ + || defined __bdver3__ || defined __bdver4__ \ + || defined __btver1__ || defined __btver2__) +# define HAS_CPUID 1 +# define HAS_I586 1 +# define HAS_I686 1 +#else +# define HAS_CPUID 0 +# define HAS_I586 0 +# define HAS_I686 0 +#endif + #endif /* cpu_features_h */ |