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Code Releases Wiki Activity

More paranoid AVX512 detection

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This commit is contained in:
Frank Denis 2019-01-02 17:33:57 +01:00
parent bdfda5dc83
commit e614671fc8
1 changed files with 14 additions and 4 deletions
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18
src/libsodium/sodium/runtime.c
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@ -39,8 +39,11 @@ static CPUFeatures _cpu_features;
#define CPUID_EDX_SSE2 0x04000000
#define XCR0_SSE 0x00000002
#define XCR0_AVX 0x00000004
#define XCR0_SSE 0x00000002
#define XCR0_AVX 0x00000004
#define XCR0_OPMASK 0x00000020
#define XCR0_ZMM_HI256 0x00000040
#define XCR0_HI16_ZMM 0x00000080
static int
_sodium_runtime_arm_cpu_features(CPUFeatures * const cpu_features)
@ -114,6 +117,7 @@ _sodium_runtime_intel_cpu_features(CPUFeatures * const cpu_features)
{
unsigned int cpu_info[4];
unsigned int id;
uint32_t xcr0 = 0U;
_cpuid(cpu_info, 0x0);
if ((id = cpu_info[0]) == 0U) {
@ -145,10 +149,12 @@ _sodium_runtime_intel_cpu_features(CPUFeatures * const cpu_features)
#endif
cpu_features->has_avx = 0;
(void) xcr0;
#ifdef HAVE_AVXINTRIN_H
if ((cpu_info[2] & (CPUID_ECX_AVX | CPUID_ECX_XSAVE | CPUID_ECX_OSXSAVE)) ==
(CPUID_ECX_AVX | CPUID_ECX_XSAVE | CPUID_ECX_OSXSAVE)) {
uint32_t xcr0 = 0U;
xcr0 = 0U;
# if defined(HAVE__XGETBV) || \
(defined(_MSC_VER) && defined(_XCR_XFEATURE_ENABLED_MASK) && _MSC_FULL_VER >= 160040219)
xcr0 = (uint32_t) _xgetbv(0);
@ -197,7 +203,11 @@ _sodium_runtime_intel_cpu_features(CPUFeatures * const cpu_features)
unsigned int cpu_info7[4];
_cpuid(cpu_info7, 0x00000007);
cpu_features->has_avx512f = ((cpu_info7[1] & CPUID_EBX_AVX512F) != 0x0);
if ((cpu_info7[1] & CPUID_EBX_AVX512F) == CPUID_EBX_AVX512F &&
(xcr0 & (XCR0_OPMASK | XCR0_ZMM_HI256 | XCR0_HI16_ZMM))
== (XCR0_OPMASK | XCR0_ZMM_HI256 | XCR0_HI16_ZMM)) {
cpu_features->has_avx512f = 1;
}
}
#endif