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Define HAS_CPUID/HAS_I586/HAS_I686 from -march=

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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.
This commit is contained in:
H.J. Lu 2015-08-18 07:59:49 -07:00
parent 441c3b59d1
commit 1814df5b02
3 changed files with 37 additions and 2 deletions
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8
ChangeLog
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@ -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]

4
sysdeps/x86/cpu-features.c
View File

@ -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

27
sysdeps/x86/cpu-features.h
View File

@ -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 */