diff options
Diffstat (limited to 'third_party/skcms/skcms.cc')
| -rw-r--r-- | third_party/skcms/skcms.cc | 86 |
1 files changed, 31 insertions, 55 deletions
diff --git a/third_party/skcms/skcms.cc b/third_party/skcms/skcms.cc index 41a67ff0a2..e81f94919a 100644 --- a/third_party/skcms/skcms.cc +++ b/third_party/skcms/skcms.cc @@ -1977,69 +1977,45 @@ typedef enum { #define TEST_FOR_HSW - static bool hsw_ok_ = false; - static void check_hsw_ok() { - // See http://www.sandpile.org/x86/cpuid.htm + static bool hsw_ok() { + static const bool ok = []{ + // See http://www.sandpile.org/x86/cpuid.htm - // First, a basic cpuid(1). - uint32_t eax, ebx, ecx, edx; - __asm__ __volatile__("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) - : "0"(1), "2"(0)); + // First, a basic cpuid(1). + uint32_t eax, ebx, ecx, edx; + __asm__ __volatile__("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) + : "0"(1), "2"(0)); - // Sanity check for prerequisites. - if ((edx & (1<<25)) != (1<<25)) { return; } // SSE - if ((edx & (1<<26)) != (1<<26)) { return; } // SSE2 - if ((ecx & (1<< 0)) != (1<< 0)) { return; } // SSE3 - if ((ecx & (1<< 9)) != (1<< 9)) { return; } // SSSE3 - if ((ecx & (1<<19)) != (1<<19)) { return; } // SSE4.1 - if ((ecx & (1<<20)) != (1<<20)) { return; } // SSE4.2 + // Sanity check for prerequisites. + if ((edx & (1<<25)) != (1<<25)) { return false; } // SSE + if ((edx & (1<<26)) != (1<<26)) { return false; } // SSE2 + if ((ecx & (1<< 0)) != (1<< 0)) { return false; } // SSE3 + if ((ecx & (1<< 9)) != (1<< 9)) { return false; } // SSSE3 + if ((ecx & (1<<19)) != (1<<19)) { return false; } // SSE4.1 + if ((ecx & (1<<20)) != (1<<20)) { return false; } // SSE4.2 - if ((ecx & (3<<26)) != (3<<26)) { return; } // XSAVE + OSXSAVE + if ((ecx & (3<<26)) != (3<<26)) { return false; } // XSAVE + OSXSAVE - { - uint32_t eax_xgetbv, edx_xgetbv; - __asm__ __volatile__("xgetbv" : "=a"(eax_xgetbv), "=d"(edx_xgetbv) : "c"(0)); - if ((eax_xgetbv & (3<<1)) != (3<<1)) { return; } // XMM+YMM state saved? - } - - if ((ecx & (1<<28)) != (1<<28)) { return; } // AVX - if ((ecx & (1<<29)) != (1<<29)) { return; } // F16C - if ((ecx & (1<<12)) != (1<<12)) { return; } // FMA (TODO: not currently used) - - // Call cpuid(7) to check for our final AVX2 feature bit! - __asm__ __volatile__("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) - : "0"(7), "2"(0)); - if ((ebx & (1<< 5)) != (1<< 5)) { return; } // AVX2 - - hsw_ok_ = true; - } + { + uint32_t eax_xgetbv, edx_xgetbv; + __asm__ __volatile__("xgetbv" : "=a"(eax_xgetbv), "=d"(edx_xgetbv) : "c"(0)); + if ((eax_xgetbv & (3<<1)) != (3<<1)) { return false; } // XMM+YMM state saved? + } - #if defined(_MSC_VER) - #include <Windows.h> - INIT_ONCE check_hsw_ok_once = INIT_ONCE_STATIC_INIT; + if ((ecx & (1<<28)) != (1<<28)) { return false; } // AVX + if ((ecx & (1<<29)) != (1<<29)) { return false; } // F16C + if ((ecx & (1<<12)) != (1<<12)) { return false; } // FMA (TODO: not currently used) - static BOOL check_hsw_ok_InitOnce_wrapper(INIT_ONCE* once, void* param, void** ctx) { - (void)once; - (void)param; - (void)ctx; - check_hsw_ok(); - return TRUE; - } + // Call cpuid(7) to check for our final AVX2 feature bit! + __asm__ __volatile__("cpuid" : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) + : "0"(7), "2"(0)); + if ((ebx & (1<< 5)) != (1<< 5)) { return false; } // AVX2 - static bool hsw_ok() { - InitOnceExecuteOnce(&check_hsw_ok_once, check_hsw_ok_InitOnce_wrapper, - nullptr, nullptr); - return hsw_ok_; - } - #else - #include <pthread.h> - static pthread_once_t check_hsw_ok_once = PTHREAD_ONCE_INIT; + return true; + }(); - static bool hsw_ok() { - pthread_once(&check_hsw_ok_once, check_hsw_ok); - return hsw_ok_; - } - #endif + return ok; + } #endif |