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out of date.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