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Check the extended control register to see if AVX is actually usable

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This commit is contained in:
Frank Denis 2015-12-14 16:45:44 +01:00
parent 53570303d0
commit ab4bade488
1 changed files with 27 additions and 10 deletions
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37
src/libsodium/sodium/runtime.c
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@ -1,4 +1,6 @@
#include <stddef.h>
#include <stdint.h>
#ifdef HAVE_ANDROID_GETCPUFEATURES
# include <cpu-features.h>
#endif
@ -19,13 +21,18 @@ typedef struct CPUFeatures_ {
static CPUFeatures _cpu_features;
#define CPUID_SSE2 0x04000000
#define CPUIDECX_SSE3 0x00000001
#define CPUIDECX_SSSE3 0x00000200
#define CPUIDECX_SSE41 0x00080000
#define CPUIDECX_AVX 0x10000000
#define CPUIDECX_PCLMUL 0x00000002
#define CPUIDECX_AESNI 0x02000000
#define CPUID_SSE2 0x04000000
#define CPUIDECX_SSE3 0x00000001
#define CPUIDECX_SSSE3 0x00000200
#define CPUIDECX_SSE41 0x00080000
#define CPUIDECX_AVX 0x10000000
#define CPUIDECX_PCLMUL 0x00000002
#define CPUIDECX_AESNI 0x02000000
#define CPUIDECX_XSAVE 0x04000000
#define CPUIDECX_OSXSAVE 0x08000000
#define XCR0_SSE 0x00000002
#define XCR0_AVX 0x00000004
static int
_sodium_runtime_arm_cpu_features(CPUFeatures * const cpu_features)
@ -130,11 +137,21 @@ _sodium_runtime_intel_cpu_features(CPUFeatures * const cpu_features)
cpu_features->has_sse41 = 0;
#endif
cpu_features->has_avx = 0;
#if defined(HAVE_AVXINTRIN_H) || \
(defined(_MSC_VER) && (defined(_M_X64) || defined(_M_AMD64) || defined(_M_IX86)))
cpu_features->has_avx = ((cpu_info[2] & CPUIDECX_AVX) != 0x0);
#else
cpu_features->has_avx = 0;
# ifdef HAVE_AMD64_ASM
if ((cpu_info[2] & (CPUIDECX_AVX | CPUIDECX_XSAVE | CPUIDECX_OSXSAVE))
== (CPUIDECX_AVX | CPUIDECX_XSAVE | CPUIDECX_OSXSAVE)) {
uint32_t eax, edx;
__asm__ __volatile__ (".byte 0x0f, 0x01, 0xd0" /* XGETBV */
: "=a"(eax), "=d"(edx)
: "c"((uint32_t) 0U));
if ((eax & (XCR0_SSE | XCR0_AVX)) == (XCR0_SSE | XCR0_AVX)) {
cpu_features->has_avx = ((cpu_info[2] & CPUIDECX_AVX) != 0x0);
}
}
# endif
#endif
#if defined(HAVE_WMMINTRIN_H) || \