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commit d90c9b1a121295a5e31810b899ab637f68898857
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Author: Joseph Myers <joseph@codesourcery.com>
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Date: Thu Sep 20 12:43:41 2018 +0000
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Invert sense of list of i686-class processors in sysdeps/x86/cpu-features.h.
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I noticed that sysdeps/x86/cpu-features.h had conditionals on whether
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to define HAS_CPUID, HAS_I586 and HAS_I686 with a long list of
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preprocessor macros for i686-and-later processors which however was
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out of date. This patch avoids the problem of the list getting out of
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date by instead having conditionals on all the (few, old) pre-i686
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processors for which GCC has preprocessor macros, rather than the
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(many, expanding list) i686-and-later processors. It seems HAS_I586
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and HAS_I686 are unused so the only effect of these macros being
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missing is that 32-bit glibc built for one of these processors would
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end up doing runtime detection of CPUID availability.
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i386 builds are prevented by a configure test so there is no need to
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allow for them here. __geode__ (no long nops?) and __k6__ (no CMOV,
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at least according to GCC) are conservatively handled as i586, not
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i686, here (as noted above, this is a theoretical distinction at
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present in that only HAS_CPUID appears to be used).
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Tested for x86.
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* sysdeps/x86/cpu-features.h [__geode__ || __k6__]: Handle like
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[__i586__ || __pentium__].
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[__i486__]: Handle explicitly.
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(HAS_CPUID): Define to 1 if above macros are undefined.
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(HAS_I586): Likewise.
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(HAS_I686): Likewise.
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diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
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index d342664c64ab7aa1..fb22d7b9d6226a92 100644
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--- a/sysdeps/x86/cpu-features.h
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+++ b/sysdeps/x86/cpu-features.h
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@@ -257,30 +257,19 @@ extern const struct cpu_features *__get_cpu_features (void)
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#ifdef __x86_64__
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# define HAS_CPUID 1
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-#elif defined __i586__ || defined __pentium__
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+#elif (defined __i586__ || defined __pentium__ \
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+ || defined __geode__ || defined __k6__)
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# define HAS_CPUID 1
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# define HAS_I586 1
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# define HAS_I686 HAS_ARCH_FEATURE (I686)
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-#elif (defined __i686__ || defined __pentiumpro__ \
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- || defined __pentium4__ || defined __nocona__ \
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- || defined __atom__ || defined __core2__ \
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- || defined __corei7__ || defined __corei7_avx__ \
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- || defined __core_avx2__ || defined __nehalem__ \
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- || defined __sandybridge__ || defined __haswell__ \
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- || defined __knl__ || defined __bonnell__ \
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- || defined __silvermont__ \
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- || defined __k6__ || defined __k8__ \
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- || defined __athlon__ || defined __amdfam10__ \
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- || defined __bdver1__ || defined __bdver2__ \
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- || defined __bdver3__ || defined __bdver4__ \
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- || defined __btver1__ || defined __btver2__)
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-# define HAS_CPUID 1
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-# define HAS_I586 1
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-# define HAS_I686 1
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-#else
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+#elif defined __i486__
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# define HAS_CPUID 0
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# define HAS_I586 HAS_ARCH_FEATURE (I586)
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# define HAS_I686 HAS_ARCH_FEATURE (I686)
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+#else
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+# define HAS_CPUID 1
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+# define HAS_I586 1
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+# define HAS_I686 1
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#endif
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#endif /* cpu_features_h */
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