-void X86Subtarget::AutoDetectSubtargetFeatures() {
- unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
- unsigned MaxLevel;
- union {
- unsigned u[3];
- char c[12];
- } text;
-
- if (X86_MC::GetCpuIDAndInfo(0, &MaxLevel, text.u+0, text.u+2, text.u+1) ||
- MaxLevel < 1)
- return;
-
- X86_MC::GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
-
- if ((EDX >> 15) & 1) { HasCMov = true; ToggleFeature(X86::FeatureCMOV); }
- if ((EDX >> 23) & 1) { X86SSELevel = MMX; ToggleFeature(X86::FeatureMMX); }
- if ((EDX >> 25) & 1) { X86SSELevel = SSE1; ToggleFeature(X86::FeatureSSE1); }
- if ((EDX >> 26) & 1) { X86SSELevel = SSE2; ToggleFeature(X86::FeatureSSE2); }
- if (ECX & 0x1) { X86SSELevel = SSE3; ToggleFeature(X86::FeatureSSE3); }
- if ((ECX >> 9) & 1) { X86SSELevel = SSSE3; ToggleFeature(X86::FeatureSSSE3);}
- if ((ECX >> 19) & 1) { X86SSELevel = SSE41; ToggleFeature(X86::FeatureSSE41);}
- if ((ECX >> 20) & 1) { X86SSELevel = SSE42; ToggleFeature(X86::FeatureSSE42);}
- if ((ECX >> 28) & 1) { X86SSELevel = AVX; ToggleFeature(X86::FeatureAVX); }
-
- bool IsIntel = memcmp(text.c, "GenuineIntel", 12) == 0;
- bool IsAMD = !IsIntel && memcmp(text.c, "AuthenticAMD", 12) == 0;
-
- if ((ECX >> 1) & 0x1) {
- HasPCLMUL = true;
- ToggleFeature(X86::FeaturePCLMUL);
- }
- if ((ECX >> 12) & 0x1) {
- HasFMA = true;
- ToggleFeature(X86::FeatureFMA);
- }
- if (IsIntel && ((ECX >> 22) & 0x1)) {
- HasMOVBE = true;
- ToggleFeature(X86::FeatureMOVBE);
- }
- if ((ECX >> 23) & 0x1) {
- HasPOPCNT = true;
- ToggleFeature(X86::FeaturePOPCNT);
- }
- if ((ECX >> 25) & 0x1) {
- HasAES = true;
- ToggleFeature(X86::FeatureAES);
- }
- if ((ECX >> 29) & 0x1) {
- HasF16C = true;
- ToggleFeature(X86::FeatureF16C);
- }
- if (IsIntel && ((ECX >> 30) & 0x1)) {
- HasRDRAND = true;
- ToggleFeature(X86::FeatureRDRAND);
- }
-
- if ((ECX >> 13) & 0x1) {
- HasCmpxchg16b = true;
- ToggleFeature(X86::FeatureCMPXCHG16B);
- }
-
- if (IsIntel || IsAMD) {
- // Determine if bit test memory instructions are slow.
- unsigned Family = 0;
- unsigned Model = 0;
- X86_MC::DetectFamilyModel(EAX, Family, Model);
- if (IsAMD || (Family == 6 && Model >= 13)) {
- IsBTMemSlow = true;
- ToggleFeature(X86::FeatureSlowBTMem);
- }
-
- // If it's Nehalem, unaligned memory access is fast.
- // Include Westmere and Sandy Bridge as well.
- // FIXME: add later processors.
- if (IsIntel && ((Family == 6 && Model == 26) ||
- (Family == 6 && Model == 44) ||
- (Family == 6 && Model == 42))) {
- IsUAMemFast = true;
- ToggleFeature(X86::FeatureFastUAMem);
- }
-
- // Set processor type. Currently only Atom is detected.
- if (Family == 6 &&
- (Model == 28 || Model == 38 || Model == 39
- || Model == 53 || Model == 54)) {
- X86ProcFamily = IntelAtom;
-
- UseLeaForSP = true;
- ToggleFeature(X86::FeatureLeaForSP);
- }
-
- unsigned MaxExtLevel;
- X86_MC::GetCpuIDAndInfo(0x80000000, &MaxExtLevel, &EBX, &ECX, &EDX);
-
- if (MaxExtLevel >= 0x80000001) {
- X86_MC::GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
- if ((EDX >> 29) & 0x1) {
- HasX86_64 = true;
- ToggleFeature(X86::Feature64Bit);
- }
- if ((ECX >> 5) & 0x1) {
- HasLZCNT = true;
- ToggleFeature(X86::FeatureLZCNT);
- }
- if (IsAMD) {
- if ((ECX >> 6) & 0x1) {
- HasSSE4A = true;
- ToggleFeature(X86::FeatureSSE4A);
- }
- if ((ECX >> 11) & 0x1) {
- HasXOP = true;
- ToggleFeature(X86::FeatureXOP);
- }
- if ((ECX >> 16) & 0x1) {
- HasFMA4 = true;
- ToggleFeature(X86::FeatureFMA4);
- }
- }
- }
- }
-
- if (MaxLevel >= 7) {
- if (!X86_MC::GetCpuIDAndInfoEx(0x7, 0x0, &EAX, &EBX, &ECX, &EDX)) {
- if (IsIntel && (EBX & 0x1)) {
- HasFSGSBase = true;
- ToggleFeature(X86::FeatureFSGSBase);
- }
- if ((EBX >> 3) & 0x1) {
- HasBMI = true;
- ToggleFeature(X86::FeatureBMI);
- }
- if (IsIntel && ((EBX >> 5) & 0x1)) {
- X86SSELevel = AVX2;
- ToggleFeature(X86::FeatureAVX2);
- }
- if (IsIntel && ((EBX >> 8) & 0x1)) {
- HasBMI2 = true;
- ToggleFeature(X86::FeatureBMI2);
- }
- if (IsIntel && ((EBX >> 11) & 0x1)) {
- HasRTM = true;
- ToggleFeature(X86::FeatureRTM);
- }
- }
- }
-}
-
-X86Subtarget::X86Subtarget(const std::string &TT, const std::string &CPU,
- const std::string &FS,
- unsigned StackAlignOverride, bool is64Bit)
- : X86GenSubtargetInfo(TT, CPU, FS)
- , X86ProcFamily(Others)
- , PICStyle(PICStyles::None)
- , X86SSELevel(NoMMXSSE)
- , X863DNowLevel(NoThreeDNow)
- , HasCMov(false)
- , HasX86_64(false)
- , HasPOPCNT(false)
- , HasSSE4A(false)
- , HasAES(false)
- , HasPCLMUL(false)
- , HasFMA(false)
- , HasFMA4(false)
- , HasXOP(false)
- , HasMOVBE(false)
- , HasRDRAND(false)
- , HasF16C(false)
- , HasFSGSBase(false)
- , HasLZCNT(false)
- , HasBMI(false)
- , HasBMI2(false)
- , HasRTM(false)
- , IsBTMemSlow(false)
- , IsUAMemFast(false)
- , HasVectorUAMem(false)
- , HasCmpxchg16b(false)
- , UseLeaForSP(false)
- , HasSlowDivide(false)
- , PostRAScheduler(false)
- , stackAlignment(4)
- // FIXME: this is a known good value for Yonah. How about others?
- , MaxInlineSizeThreshold(128)
- , TargetTriple(TT)
- , In64BitMode(is64Bit) {
- // Determine default and user specified characteristics