Use the target options specified on a function to reset the back-end.
During LTO, the target options on functions within the same Module may
change. This would necessitate resetting some of the back-end. Do this for X86,
because it's a Friday afternoon.
llvm-svn: 178917
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index f42bdbd..82bb37e 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -620,12 +620,56 @@
TargetLoweringBase::TargetLoweringBase(const TargetMachine &tm,
const TargetLoweringObjectFile *tlof)
: TM(tm), TD(TM.getDataLayout()), TLOF(*tlof) {
+ initActions();
+
+ // Perform these initializations only once.
+ IsLittleEndian = TD->isLittleEndian();
+ PointerTy = MVT::getIntegerVT(8*TD->getPointerSize(0));
+ MaxStoresPerMemset = MaxStoresPerMemcpy = MaxStoresPerMemmove = 8;
+ MaxStoresPerMemsetOptSize = MaxStoresPerMemcpyOptSize
+ = MaxStoresPerMemmoveOptSize = 4;
+ UseUnderscoreSetJmp = false;
+ UseUnderscoreLongJmp = false;
+ SelectIsExpensive = false;
+ IntDivIsCheap = false;
+ Pow2DivIsCheap = false;
+ JumpIsExpensive = false;
+ PredictableSelectIsExpensive = false;
+ StackPointerRegisterToSaveRestore = 0;
+ ExceptionPointerRegister = 0;
+ ExceptionSelectorRegister = 0;
+ BooleanContents = UndefinedBooleanContent;
+ BooleanVectorContents = UndefinedBooleanContent;
+ SchedPreferenceInfo = Sched::ILP;
+ JumpBufSize = 0;
+ JumpBufAlignment = 0;
+ MinFunctionAlignment = 0;
+ PrefFunctionAlignment = 0;
+ PrefLoopAlignment = 0;
+ MinStackArgumentAlignment = 1;
+ ShouldFoldAtomicFences = false;
+ InsertFencesForAtomic = false;
+ SupportJumpTables = true;
+ MinimumJumpTableEntries = 4;
+
+ InitLibcallNames(LibcallRoutineNames, TM);
+ InitCmpLibcallCCs(CmpLibcallCCs);
+ InitLibcallCallingConvs(LibcallCallingConvs);
+}
+
+TargetLoweringBase::~TargetLoweringBase() {
+ delete &TLOF;
+}
+
+void TargetLoweringBase::initActions() {
// All operations default to being supported.
memset(OpActions, 0, sizeof(OpActions));
memset(LoadExtActions, 0, sizeof(LoadExtActions));
memset(TruncStoreActions, 0, sizeof(TruncStoreActions));
memset(IndexedModeActions, 0, sizeof(IndexedModeActions));
memset(CondCodeActions, 0, sizeof(CondCodeActions));
+ memset(RegClassForVT, 0,MVT::LAST_VALUETYPE*sizeof(TargetRegisterClass*));
+ memset(TargetDAGCombineArray, 0, array_lengthof(TargetDAGCombineArray));
// Set default actions for various operations.
for (unsigned VT = 0; VT != (unsigned)MVT::LAST_VALUETYPE; ++VT) {
@@ -702,45 +746,6 @@
// here is to inform DAG Legalizer to replace DEBUGTRAP with TRAP.
//
setOperationAction(ISD::DEBUGTRAP, MVT::Other, Expand);
-
- IsLittleEndian = TD->isLittleEndian();
- PointerTy = MVT::getIntegerVT(8*TD->getPointerSize(0));
- memset(RegClassForVT, 0,MVT::LAST_VALUETYPE*sizeof(TargetRegisterClass*));
- memset(TargetDAGCombineArray, 0, array_lengthof(TargetDAGCombineArray));
- MaxStoresPerMemset = MaxStoresPerMemcpy = MaxStoresPerMemmove = 8;
- MaxStoresPerMemsetOptSize = MaxStoresPerMemcpyOptSize
- = MaxStoresPerMemmoveOptSize = 4;
- UseUnderscoreSetJmp = false;
- UseUnderscoreLongJmp = false;
- SelectIsExpensive = false;
- IntDivIsCheap = false;
- Pow2DivIsCheap = false;
- JumpIsExpensive = false;
- PredictableSelectIsExpensive = false;
- StackPointerRegisterToSaveRestore = 0;
- ExceptionPointerRegister = 0;
- ExceptionSelectorRegister = 0;
- BooleanContents = UndefinedBooleanContent;
- BooleanVectorContents = UndefinedBooleanContent;
- SchedPreferenceInfo = Sched::ILP;
- JumpBufSize = 0;
- JumpBufAlignment = 0;
- MinFunctionAlignment = 0;
- PrefFunctionAlignment = 0;
- PrefLoopAlignment = 0;
- MinStackArgumentAlignment = 1;
- ShouldFoldAtomicFences = false;
- InsertFencesForAtomic = false;
- SupportJumpTables = true;
- MinimumJumpTableEntries = 4;
-
- InitLibcallNames(LibcallRoutineNames, TM);
- InitCmpLibcallCCs(CmpLibcallCCs);
- InitLibcallCallingConvs(LibcallCallingConvs);
-}
-
-TargetLoweringBase::~TargetLoweringBase() {
- delete &TLOF;
}
MVT TargetLoweringBase::getScalarShiftAmountTy(EVT LHSTy) const {
diff --git a/llvm/lib/CodeGen/TargetOptionsImpl.cpp b/llvm/lib/CodeGen/TargetOptionsImpl.cpp
index 0f59d01..435a5e7 100644
--- a/llvm/lib/CodeGen/TargetOptionsImpl.cpp
+++ b/llvm/lib/CodeGen/TargetOptionsImpl.cpp
@@ -50,3 +50,29 @@
return TrapFuncName;
}
+bool TargetOptions::operator==(const TargetOptions &TO) {
+#define ARE_EQUAL(X) X == TO.X
+ return
+ ARE_EQUAL(UnsafeFPMath) &&
+ ARE_EQUAL(NoInfsFPMath) &&
+ ARE_EQUAL(NoNaNsFPMath) &&
+ ARE_EQUAL(HonorSignDependentRoundingFPMathOption) &&
+ ARE_EQUAL(UseSoftFloat) &&
+ ARE_EQUAL(NoZerosInBSS) &&
+ ARE_EQUAL(JITExceptionHandling) &&
+ ARE_EQUAL(JITEmitDebugInfo) &&
+ ARE_EQUAL(JITEmitDebugInfoToDisk) &&
+ ARE_EQUAL(GuaranteedTailCallOpt) &&
+ ARE_EQUAL(DisableTailCalls) &&
+ ARE_EQUAL(StackAlignmentOverride) &&
+ ARE_EQUAL(RealignStack) &&
+ ARE_EQUAL(SSPBufferSize) &&
+ ARE_EQUAL(EnableFastISel) &&
+ ARE_EQUAL(PositionIndependentExecutable) &&
+ ARE_EQUAL(EnableSegmentedStacks) &&
+ ARE_EQUAL(UseInitArray) &&
+ ARE_EQUAL(TrapFuncName) &&
+ ARE_EQUAL(FloatABIType) &&
+ ARE_EQUAL(AllowFPOpFusion);
+#undef ARE_EQUAL
+}
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 6934186..c4f1176 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -163,10 +163,28 @@
Subtarget = &TM.getSubtarget<X86Subtarget>();
X86ScalarSSEf64 = Subtarget->hasSSE2();
X86ScalarSSEf32 = Subtarget->hasSSE1();
-
RegInfo = TM.getRegisterInfo();
TD = getDataLayout();
+ resetOperationActions();
+}
+
+void X86TargetLowering::resetOperationActions() {
+ const TargetMachine &TM = getTargetMachine();
+ static bool FirstTimeThrough = true;
+
+ // If none of the target options have changed, then we don't need to reset the
+ // operation actions.
+ if (!FirstTimeThrough && TO == TM.Options) return;
+
+ if (!FirstTimeThrough) {
+ // Reinitialize the actions.
+ initActions();
+ FirstTimeThrough = false;
+ }
+
+ TO = TM.Options;
+
// Set up the TargetLowering object.
static const MVT IntVTs[] = { MVT::i8, MVT::i16, MVT::i32, MVT::i64 };
diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h
index 5725f7a..2727e22 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.h
+++ b/llvm/lib/Target/X86/X86ISelLowering.h
@@ -723,6 +723,9 @@
SDValue BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain, SDValue StackSlot,
SelectionDAG &DAG) const;
+ /// \brief Reset the operation actions based on target options.
+ virtual void resetOperationActions();
+
protected:
std::pair<const TargetRegisterClass*, uint8_t>
findRepresentativeClass(MVT VT) const;
@@ -734,6 +737,10 @@
const X86RegisterInfo *RegInfo;
const DataLayout *TD;
+ /// Used to store the TargetOptions so that we don't waste time resetting
+ /// the operation actions unless we have to.
+ TargetOptions TO;
+
/// X86ScalarSSEf32, X86ScalarSSEf64 - Select between SSE or x87
/// floating point ops.
/// When SSE is available, use it for f32 operations.