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driver-i386.c (host_detect_local_cpu): Check maximum ext_level before calling CPUID with 0x80000008. 

* config/i386/driver-i386.c (host_detect_local_cpu): Check maximum
	ext_level before calling CPUID with 0x80000008.
	Simplify xgetbv checks.

From-SVN: r240637
This commit is contained in:
Uros Bizjak 2016-09-29 22:49:58 +02:00 committed by Uros Bizjak
parent dd4b238a77
commit 0a2d7bc05a
2 changed files with 23 additions and 9 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-09-29 Uros Bizjak <ubizjak@gmail.com>
* config/i386/driver-i386.c (host_detect_local_cpu): Check maximum
ext_level before calling CPUID with 0x80000008.
Simplify xgetbv checks.
2016-09-29 David Malcolm <dmalcolm@redhat.com>
* Makefile.in (OBJS): Add print-rtl-function.o.

26
gcc/config/i386/driver-i386.c
View File

@ -517,7 +517,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
/* Check cpuid level of extended features. */
__cpuid (0x80000000, ext_level, ebx, ecx, edx);
if (ext_level > 0x80000000)
if (ext_level >= 0x80000001)
{
__cpuid (0x80000001, eax, ebx, ecx, edx);
@ -535,7 +535,10 @@ const char *host_detect_local_cpu (int argc, const char **argv)
has_3dnowp = edx & bit_3DNOWP;
has_3dnow = edx & bit_3DNOW;
has_mwaitx = ecx & bit_MWAITX;
}
if (ext_level >= 0x80000008)
{
__cpuid (0x80000008, eax, ebx, ecx, edx);
has_clzero = ebx & bit_CLZERO;
}
@ -548,14 +551,21 @@ const char *host_detect_local_cpu (int argc, const char **argv)
#define XSTATE_OPMASK 0x20
#define XSTATE_ZMM 0x40
#define XSTATE_HI_ZMM 0x80
#define XCR_AVX_ENABLED_MASK \
(XSTATE_SSE | XSTATE_YMM)
#define XCR_AVX512F_ENABLED_MASK \
(XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK | XSTATE_ZMM | XSTATE_HI_ZMM)
if (has_osxsave)
asm (".byte 0x0f; .byte 0x01; .byte 0xd0"
: "=a" (eax), "=d" (edx)
: "c" (XCR_XFEATURE_ENABLED_MASK));
else
eax = 0;
/* Check if SSE and YMM states are supported. */
if (!has_osxsave
|| (eax & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM))
/* Check if AVX registers are supported. */
if ((eax & XCR_AVX_ENABLED_MASK) != XCR_AVX_ENABLED_MASK)
{
has_avx = 0;
has_avx2 = 0;
@ -569,10 +579,8 @@ const char *host_detect_local_cpu (int argc, const char **argv)
has_xsavec = 0;
}
if (!has_osxsave
|| (eax &
(XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK | XSTATE_ZMM | XSTATE_HI_ZMM))
!= (XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK | XSTATE_ZMM | XSTATE_HI_ZMM))
/* Check if AVX512F registers are supported. */
if ((eax & XCR_AVX512F_ENABLED_MASK) != XCR_AVX512F_ENABLED_MASK)
{
has_avx512f = 0;
has_avx512er = 0;
@ -603,7 +611,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
unsigned int name;
/* Detect geode processor by its processor signature. */
if (ext_level > 0x80000001)
if (ext_level >= 0x80000002)
__cpuid (0x80000002, name, ebx, ecx, edx);
else
name = 0;