diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/corelib/tools/qsimd.cpp | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp index 07558cedda..a99c460b06 100644 --- a/src/corelib/tools/qsimd.cpp +++ b/src/corelib/tools/qsimd.cpp @@ -253,6 +253,22 @@ static void xgetbv(uint in, uint &eax, uint &edx) static inline uint detectProcessorFeatures() { + // Flags from the CR0 / XCR0 state register + enum XCR0Flags { + X87 = 1 << 0, + XMM0_15 = 1 << 1, + YMM0_15Hi128 = 1 << 2, + BNDRegs = 1 << 3, + BNDCSR = 1 << 4, + OpMask = 1 << 5, + ZMM0_15Hi256 = 1 << 6, + ZMM16_31 = 1 << 7, + + SSEState = XMM0_15, + AVXState = XMM0_15 | YMM0_15Hi128, + AVX512State = AVXState | OpMask | ZMM0_15Hi256 | ZMM16_31 + }; + uint features = 0; int cpuidLevel = maxBasicCpuidSupported(); if (cpuidLevel < 1) @@ -264,6 +280,7 @@ static inline uint detectProcessorFeatures() // x86 might not have SSE2 support if (cpuid01EDX & (1u << 26)) features |= SSE2; + // we should verify that the OS enabled saving of the SSE state... #else // x86-64 or x32 features = SSE2; @@ -291,7 +308,7 @@ static inline uint detectProcessorFeatures() if (cpuidLevel >= 7) cpuidFeatures07_00(cpuid0700EBX); - if ((xgetbvA & 6) == 6) { + if ((xgetbvA & AVXState) == AVXState) { // support for YMM and XMM registers is enabled if (cpuid01ECX & (1u << 28)) features |= AVX; |