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Changed the vendor string detection code, added the compareVendorString() helper function.

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This commit is contained in:
koscrob 2024-02-21 10:31:20 +01:00
parent 53be4995fb
commit 16a2efaf7f
1 changed files with 9 additions and 5 deletions
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14
xbyak/xbyak_util.h
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@ -145,6 +145,13 @@ private:
uint32_t dataCacheLevels_;
uint32_t avx10version_;
bool compareVendorString(const uint32_t EBX, const uint32_t ECX, const uint32_t EDX, const char vendorString[12]) {
return (
*reinterpret_cast<const uint32_t*>(&vendorString[0]) == EBX &&
*reinterpret_cast<const uint32_t*>(&vendorString[4]) == EDX &&
*reinterpret_cast<const uint32_t*>(&vendorString[8]) == ECX
);
}
uint32_t extractBit(uint32_t val, uint32_t base, uint32_t end)
{
return (val >> base) & ((1u << (end + 1 - base)) - 1);
@ -555,9 +562,7 @@ public:
const uint32_t& EDX = data[3];
getCpuid(0, data);
const uint32_t maxNum = EAX;
static const uint32_t amd[] = { 0x68747541 /* Auth */, 0x444D4163 /* cAMD */, 0x69746E65 /* enti */};
static const uint32_t intel[] = { 0x756E6547 /* Genu */, 0x6C65746E /* ntel */, 0x49656E69 /* ineI */};
if (EBX == amd[0] && ECX == amd[1] && EDX == amd[2]) {
if (compareVendorString(EBX, ECX, EDX, "AuthenticAMD")) {
type_ |= tAMD;
getCpuid(0x80000001, data);
if (EDX & (1U << 31)) {
@ -570,8 +575,7 @@ public:
// Long mode implies support for PREFETCHW on AMD
type_ |= tPREFETCHW;
}
}
if (EBX == intel[0] && ECX == intel[1] && EDX == intel[2]) {
} else if (compareVendorString(EBX, ECX, EDX, "GenuineIntel")) {
type_ |= tINTEL;
}