Hi!
As discussed in the PR, because -mf16c implies -mavx, if the CPU has
F16C (and AVX) support, but OS doesn't save YMM state, we shouldn't
be passing -mf16c.
Also, as noticed by Uros, the clearing of has_fma4 and has_xop if
OS doesn't save YMM state was done before it was set.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2014-02-17 Jakub Jelinek <ja...@redhat.com>
Uros Bizjak <ubiz...@gmail.com>
PR driver/60233
* config/i386/driver-i386.c (host_detect_local_cpu): If
YMM state is not saved by the OS, also clear has_f16c. Move
CPUID 0x80000001 handling before YMM state saving checking.
--- gcc/config/i386/driver-i386.c.jj 2014-01-03 11:41:06.000000000 +0100
+++ gcc/config/i386/driver-i386.c 2014-02-17 10:46:30.572170077 +0100
@@ -495,6 +495,28 @@ const char *host_detect_local_cpu (int a
has_xsaveopt = eax & bit_XSAVEOPT;
}
+ /* Check cpuid level of extended features. */
+ __cpuid (0x80000000, ext_level, ebx, ecx, edx);
+
+ if (ext_level > 0x80000000)
+ {
+ __cpuid (0x80000001, eax, ebx, ecx, edx);
+
+ has_lahf_lm = ecx & bit_LAHF_LM;
+ has_sse4a = ecx & bit_SSE4a;
+ has_abm = ecx & bit_ABM;
+ has_lwp = ecx & bit_LWP;
+ has_fma4 = ecx & bit_FMA4;
+ has_xop = ecx & bit_XOP;
+ has_tbm = ecx & bit_TBM;
+ has_lzcnt = ecx & bit_LZCNT;
+ has_prfchw = ecx & bit_PRFCHW;
+
+ has_longmode = edx & bit_LM;
+ has_3dnowp = edx & bit_3DNOWP;
+ has_3dnow = edx & bit_3DNOW;
+ }
+
/* Get XCR_XFEATURE_ENABLED_MASK register with xgetbv. */
#define XCR_XFEATURE_ENABLED_MASK 0x0
#define XSTATE_FP 0x1
@@ -513,33 +535,12 @@ const char *host_detect_local_cpu (int a
has_avx2 = 0;
has_fma = 0;
has_fma4 = 0;
+ has_f16c = 0;
has_xop = 0;
has_xsave = 0;
has_xsaveopt = 0;
}
- /* Check cpuid level of extended features. */
- __cpuid (0x80000000, ext_level, ebx, ecx, edx);
-
- if (ext_level > 0x80000000)
- {
- __cpuid (0x80000001, eax, ebx, ecx, edx);
-
- has_lahf_lm = ecx & bit_LAHF_LM;
- has_sse4a = ecx & bit_SSE4a;
- has_abm = ecx & bit_ABM;
- has_lwp = ecx & bit_LWP;
- has_fma4 = ecx & bit_FMA4;
- has_xop = ecx & bit_XOP;
- has_tbm = ecx & bit_TBM;
- has_lzcnt = ecx & bit_LZCNT;
- has_prfchw = ecx & bit_PRFCHW;
-
- has_longmode = edx & bit_LM;
- has_3dnowp = edx & bit_3DNOWP;
- has_3dnow = edx & bit_3DNOW;
- }
-
if (!arch)
{
if (vendor == signature_AMD_ebx
Jakub
