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Diffstat (limited to 'lib/Target/X86/X86Subtarget.cpp')
-rw-r--r--lib/Target/X86/X86Subtarget.cpp163
1 files changed, 55 insertions, 108 deletions
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index ad023623142f..7e84323dda4c 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -68,14 +68,36 @@ X86Subtarget::classifyGlobalReference(const GlobalValue *GV) const {
unsigned char
X86Subtarget::classifyLocalReference(const GlobalValue *GV) const {
- // 64 bits can use %rip addressing for anything local.
- if (is64Bit())
+ // If we're not PIC, it's not very interesting.
+ if (!isPositionIndependent())
return X86II::MO_NO_FLAG;
- // If this is for a position dependent executable, the static linker can
- // figure it out.
- if (!isPositionIndependent())
+ if (is64Bit()) {
+ // 64-bit ELF PIC local references may use GOTOFF relocations.
+ if (isTargetELF()) {
+ switch (TM.getCodeModel()) {
+ // 64-bit small code model is simple: All rip-relative.
+ case CodeModel::Small:
+ case CodeModel::Kernel:
+ return X86II::MO_NO_FLAG;
+
+ // The large PIC code model uses GOTOFF.
+ case CodeModel::Large:
+ return X86II::MO_GOTOFF;
+
+ // Medium is a hybrid: RIP-rel for code, GOTOFF for DSO local data.
+ case CodeModel::Medium:
+ if (isa<Function>(GV))
+ return X86II::MO_NO_FLAG; // All code is RIP-relative
+ return X86II::MO_GOTOFF; // Local symbols use GOTOFF.
+ }
+ llvm_unreachable("invalid code model");
+ }
+
+ // Otherwise, this is either a RIP-relative reference or a 64-bit movabsq,
+ // both of which use MO_NO_FLAG.
return X86II::MO_NO_FLAG;
+ }
// The COFF dynamic linker just patches the executable sections.
if (isTargetCOFF())
@@ -97,8 +119,8 @@ X86Subtarget::classifyLocalReference(const GlobalValue *GV) const {
unsigned char X86Subtarget::classifyGlobalReference(const GlobalValue *GV,
const Module &M) const {
- // Large model never uses stubs.
- if (TM.getCodeModel() == CodeModel::Large)
+ // The static large model never uses stubs.
+ if (TM.getCodeModel() == CodeModel::Large && !isPositionIndependent())
return X86II::MO_NO_FLAG;
// Absolute symbols can be referenced directly.
@@ -120,8 +142,14 @@ unsigned char X86Subtarget::classifyGlobalReference(const GlobalValue *GV,
if (isTargetCOFF())
return X86II::MO_DLLIMPORT;
- if (is64Bit())
+ if (is64Bit()) {
+ // ELF supports a large, truly PIC code model with non-PC relative GOT
+ // references. Other object file formats do not. Use the no-flag, 64-bit
+ // reference for them.
+ if (TM.getCodeModel() == CodeModel::Large)
+ return isTargetELF() ? X86II::MO_GOT : X86II::MO_NO_FLAG;
return X86II::MO_GOTPCREL;
+ }
if (isTargetDarwin()) {
if (!isPositionIndependent())
@@ -157,8 +185,11 @@ X86Subtarget::classifyGlobalFunctionReference(const GlobalValue *GV,
// In Regcall calling convention those registers are used for passing
// parameters. Thus we need to prevent lazy binding in Regcall.
return X86II::MO_GOTPCREL;
- if (F && F->hasFnAttribute(Attribute::NonLazyBind) && is64Bit())
- return X86II::MO_GOTPCREL;
+ // If PLT must be avoided then the call should be via GOTPCREL.
+ if (((F && F->hasFnAttribute(Attribute::NonLazyBind)) ||
+ (!F && M.getRtLibUseGOT())) &&
+ is64Bit())
+ return X86II::MO_GOTPCREL;
return X86II::MO_PLT;
}
@@ -216,8 +247,6 @@ void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
// micro-architectures respectively.
if (hasSSE42() || hasSSE4A())
IsUAMem16Slow = false;
-
- InstrItins = getInstrItineraryForCPU(CPUName);
// It's important to keep the MCSubtargetInfo feature bits in sync with
// target data structure which is shared with MC code emitter, etc.
@@ -230,9 +259,9 @@ void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
else
llvm_unreachable("Not 16-bit, 32-bit or 64-bit mode!");
- DEBUG(dbgs() << "Subtarget features: SSELevel " << X86SSELevel
- << ", 3DNowLevel " << X863DNowLevel
- << ", 64bit " << HasX86_64 << "\n");
+ LLVM_DEBUG(dbgs() << "Subtarget features: SSELevel " << X86SSELevel
+ << ", 3DNowLevel " << X863DNowLevel << ", 64bit "
+ << HasX86_64 << "\n");
assert((!In64BitMode || HasX86_64) &&
"64-bit code requested on a subtarget that doesn't support it!");
@@ -254,112 +283,30 @@ void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
GatherOverhead = 2;
if (hasAVX512())
ScatterOverhead = 2;
-}
-void X86Subtarget::initializeEnvironment() {
- X86SSELevel = NoSSE;
- X863DNowLevel = NoThreeDNow;
- HasX87 = false;
- HasCMov = false;
- HasX86_64 = false;
- HasPOPCNT = false;
- HasSSE4A = false;
- HasAES = false;
- HasVAES = false;
- HasFXSR = false;
- HasXSAVE = false;
- HasXSAVEOPT = false;
- HasXSAVEC = false;
- HasXSAVES = false;
- HasPCLMUL = false;
- HasVPCLMULQDQ = false;
- HasGFNI = false;
- HasFMA = false;
- HasFMA4 = false;
- HasXOP = false;
- HasTBM = false;
- HasLWP = false;
- HasMOVBE = false;
- HasRDRAND = false;
- HasF16C = false;
- HasFSGSBase = false;
- HasLZCNT = false;
- HasBMI = false;
- HasBMI2 = false;
- HasVBMI = false;
- HasVBMI2 = false;
- HasIFMA = false;
- HasRTM = false;
- HasERI = false;
- HasCDI = false;
- HasPFI = false;
- HasDQI = false;
- HasVPOPCNTDQ = false;
- HasBWI = false;
- HasVLX = false;
- HasADX = false;
- HasPKU = false;
- HasVNNI = false;
- HasBITALG = false;
- HasSHA = false;
- HasPREFETCHWT1 = false;
- HasPRFCHW = false;
- HasRDSEED = false;
- HasLAHFSAHF = false;
- HasMWAITX = false;
- HasCLZERO = false;
- HasMPX = false;
- HasSHSTK = false;
- HasIBT = false;
- HasSGX = false;
- HasCLFLUSHOPT = false;
- HasCLWB = false;
- IsPMULLDSlow = false;
- IsSHLDSlow = false;
- IsUAMem16Slow = false;
- IsUAMem32Slow = false;
- HasSSEUnalignedMem = false;
- HasCmpxchg16b = false;
- UseLeaForSP = false;
- HasFastVariableShuffle = false;
- HasFastPartialYMMorZMMWrite = false;
- HasFastGather = false;
- HasFastScalarFSQRT = false;
- HasFastVectorFSQRT = false;
- HasFastLZCNT = false;
- HasFastSHLDRotate = false;
- HasMacroFusion = false;
- HasERMSB = false;
- HasSlowDivide32 = false;
- HasSlowDivide64 = false;
- PadShortFunctions = false;
- SlowTwoMemOps = false;
- LEAUsesAG = false;
- SlowLEA = false;
- Slow3OpsLEA = false;
- SlowIncDec = false;
- stackAlignment = 4;
- // FIXME: this is a known good value for Yonah. How about others?
- MaxInlineSizeThreshold = 128;
- UseSoftFloat = false;
- X86ProcFamily = Others;
- GatherOverhead = 1024;
- ScatterOverhead = 1024;
+ // Consume the vector width attribute or apply any target specific limit.
+ if (PreferVectorWidthOverride)
+ PreferVectorWidth = PreferVectorWidthOverride;
+ else if (Prefer256Bit)
+ PreferVectorWidth = 256;
}
X86Subtarget &X86Subtarget::initializeSubtargetDependencies(StringRef CPU,
StringRef FS) {
- initializeEnvironment();
initSubtargetFeatures(CPU, FS);
return *this;
}
X86Subtarget::X86Subtarget(const Triple &TT, StringRef CPU, StringRef FS,
const X86TargetMachine &TM,
- unsigned StackAlignOverride)
- : X86GenSubtargetInfo(TT, CPU, FS), X86ProcFamily(Others),
+ unsigned StackAlignOverride,
+ unsigned PreferVectorWidthOverride,
+ unsigned RequiredVectorWidth)
+ : X86GenSubtargetInfo(TT, CPU, FS),
PICStyle(PICStyles::None), TM(TM), TargetTriple(TT),
StackAlignOverride(StackAlignOverride),
+ PreferVectorWidthOverride(PreferVectorWidthOverride),
+ RequiredVectorWidth(RequiredVectorWidth),
In64BitMode(TargetTriple.getArch() == Triple::x86_64),
In32BitMode(TargetTriple.getArch() == Triple::x86 &&
TargetTriple.getEnvironment() != Triple::CODE16),
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 15:12:37 +0000