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-rw-r--r--lib/Target/X86/X86ISelSimple.cpp174
1 files changed, 20 insertions, 154 deletions
diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp
index 1df8cb8..c243fa1 100644
--- a/lib/Target/X86/X86ISelSimple.cpp
+++ b/lib/Target/X86/X86ISelSimple.cpp
@@ -162,11 +162,7 @@ namespace {
MachineBasicBlock::iterator &MBBI);
// Memory Instructions
- MachineInstr *doFPLoad(MachineBasicBlock *MBB,
- MachineBasicBlock::iterator &MBBI,
- const Type *Ty, unsigned DestReg);
void visitLoadInst(LoadInst &I);
- void doFPStore(const Type *Ty, unsigned DestAddrReg, unsigned SrcReg);
void visitStoreInst(StoreInst &I);
void visitGetElementPtrInst(GetElementPtrInst &I);
void visitAllocaInst(AllocaInst &I);
@@ -401,7 +397,11 @@ void ISel::copyConstantToRegister(MachineBasicBlock *MBB,
// Otherwise we need to spill the constant to memory...
MachineConstantPool *CP = F->getConstantPool();
unsigned CPI = CP->getConstantPoolIndex(CFP);
- addConstantPoolReference(doFPLoad(MBB, IP, CFP->getType(), R), CPI);
+ const Type *Ty = CFP->getType();
+
+ assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
+ unsigned LoadOpcode = Ty == Type::FloatTy ? X86::FLDr32 : X86::FLDr64;
+ addConstantPoolReference(BMI(MBB, IP, LoadOpcode, 4, R), CPI);
}
} else if (isa<ConstantPointerNull>(C)) {
@@ -1536,52 +1536,6 @@ void ISel::visitShiftInst(ShiftInst &I) {
}
-/// doFPLoad - This method is used to load an FP value from memory using the
-/// current endianness. NOTE: This method returns a partially constructed load
-/// instruction which needs to have the memory source filled in still.
-///
-MachineInstr *ISel::doFPLoad(MachineBasicBlock *MBB,
- MachineBasicBlock::iterator &MBBI,
- const Type *Ty, unsigned DestReg) {
- assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
- unsigned LoadOpcode = Ty == Type::FloatTy ? X86::FLDr32 : X86::FLDr64;
-
- if (TM.getTargetData().isLittleEndian()) // fast path...
- return BMI(MBB, MBBI, LoadOpcode, 4, DestReg);
-
- // If we are big-endian, start by creating an LEA instruction to represent the
- // address of the memory location to load from...
- //
- unsigned SrcAddrReg = makeAnotherReg(Type::UIntTy);
- MachineInstr *Result = BMI(MBB, MBBI, X86::LEAr32, 5, SrcAddrReg);
-
- // Allocate a temporary stack slot to transform the value into...
- int FrameIdx = F->getFrameInfo()->CreateStackObject(Ty, TM.getTargetData());
-
- // Perform the bswaps 32 bits at a time...
- unsigned TmpReg1 = makeAnotherReg(Type::UIntTy);
- unsigned TmpReg2 = makeAnotherReg(Type::UIntTy);
- addDirectMem(BMI(MBB, MBBI, X86::MOVmr32, 4, TmpReg1), SrcAddrReg);
- BMI(MBB, MBBI, X86::BSWAPr32, 1, TmpReg2).addReg(TmpReg1);
- unsigned Offset = (Ty == Type::DoubleTy) << 2;
- addFrameReference(BMI(MBB, MBBI, X86::MOVrm32, 5),
- FrameIdx, Offset).addReg(TmpReg2);
-
- if (Ty == Type::DoubleTy) { // Swap the other 32 bits of a double value...
- TmpReg1 = makeAnotherReg(Type::UIntTy);
- TmpReg2 = makeAnotherReg(Type::UIntTy);
-
- addRegOffset(BMI(MBB, MBBI, X86::MOVmr32, 4, TmpReg1), SrcAddrReg, 4);
- BMI(MBB, MBBI, X86::BSWAPr32, 1, TmpReg2).addReg(TmpReg1);
- unsigned Offset = (Ty == Type::DoubleTy) << 2;
- addFrameReference(BMI(MBB, MBBI, X86::MOVrm32,5), FrameIdx).addReg(TmpReg2);
- }
-
- // Now we can reload the final byteswapped result into the final destination.
- addFrameReference(BMI(MBB, MBBI, LoadOpcode, 4, DestReg), FrameIdx);
- return Result;
-}
-
/// EmitByteSwap - Byteswap SrcReg into DestReg.
///
void ISel::EmitByteSwap(unsigned DestReg, unsigned SrcReg, unsigned Class) {
@@ -1616,8 +1570,6 @@ void ISel::EmitByteSwap(unsigned DestReg, unsigned SrcReg, unsigned Class) {
/// need to worry about the memory layout of the target machine.
///
void ISel::visitLoadInst(LoadInst &I) {
- bool isLittleEndian = TM.getTargetData().isLittleEndian();
- bool hasLongPointers = TM.getTargetData().getPointerSize() == 8;
unsigned SrcAddrReg = getReg(I.getOperand(0));
unsigned DestReg = getReg(I);
@@ -1625,7 +1577,10 @@ void ISel::visitLoadInst(LoadInst &I) {
switch (Class) {
case cFP: {
MachineBasicBlock::iterator MBBI = BB->end();
- addDirectMem(doFPLoad(BB, MBBI, I.getType(), DestReg), SrcAddrReg);
+ assert(I.getType() == Type::FloatTy || I.getType() == Type::DoubleTy &&
+ "Unknown FP type!");
+ unsigned Opc = I.getType() == Type::FloatTy ? X86::FLDr32 : X86::FLDr64;
+ addDirectMem(BMI(BB, MBBI, Opc, 4, DestReg), SrcAddrReg);
return;
}
case cLong: case cInt: case cShort: case cByte:
@@ -1633,20 +1588,7 @@ void ISel::visitLoadInst(LoadInst &I) {
default: assert(0 && "Unknown memory class!");
}
- // We need to adjust the input pointer if we are emulating a big-endian
- // long-pointer target. On these systems, the pointer that we are interested
- // in is in the upper part of the eight byte memory image of the pointer. It
- // also happens to be byte-swapped, but this will be handled later.
- //
- if (!isLittleEndian && hasLongPointers && isa<PointerType>(I.getType())) {
- unsigned R = makeAnotherReg(Type::UIntTy);
- BuildMI(BB, X86::ADDri32, 2, R).addReg(SrcAddrReg).addZImm(4);
- SrcAddrReg = R;
- }
-
unsigned IReg = DestReg;
- if (!isLittleEndian) // If big endian we need an intermediate stage
- DestReg = makeAnotherReg(Class != cLong ? I.getType() : Type::UIntTy);
static const unsigned Opcode[] = {
X86::MOVmr8, X86::MOVmr16, X86::MOVmr32, 0, X86::MOVmr32
@@ -1654,110 +1596,34 @@ void ISel::visitLoadInst(LoadInst &I) {
addDirectMem(BuildMI(BB, Opcode[Class], 4, DestReg), SrcAddrReg);
// Handle long values now...
- if (Class == cLong) {
- if (isLittleEndian) {
- addRegOffset(BuildMI(BB, X86::MOVmr32, 4, DestReg+1), SrcAddrReg, 4);
- } else {
- EmitByteSwap(IReg+1, DestReg, cInt);
- unsigned TempReg = makeAnotherReg(Type::IntTy);
- addRegOffset(BuildMI(BB, X86::MOVmr32, 4, TempReg), SrcAddrReg, 4);
- EmitByteSwap(IReg, TempReg, cInt);
- }
- return;
- }
-
- if (!isLittleEndian)
- EmitByteSwap(IReg, DestReg, Class);
+ if (Class == cLong)
+ addRegOffset(BuildMI(BB, X86::MOVmr32, 4, DestReg+1), SrcAddrReg, 4);
}
-
-/// doFPStore - This method is used to store an FP value to memory using the
-/// current endianness.
-///
-void ISel::doFPStore(const Type *Ty, unsigned DestAddrReg, unsigned SrcReg) {
- assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
- unsigned StoreOpcode = Ty == Type::FloatTy ? X86::FSTr32 : X86::FSTr64;
-
- if (TM.getTargetData().isLittleEndian()) { // fast path...
- addDirectMem(BuildMI(BB, StoreOpcode,5), DestAddrReg).addReg(SrcReg);
- return;
- }
-
- // Allocate a temporary stack slot to transform the value into...
- int FrameIdx = F->getFrameInfo()->CreateStackObject(Ty, TM.getTargetData());
- unsigned SrcAddrReg = makeAnotherReg(Type::UIntTy);
- addFrameReference(BuildMI(BB, X86::LEAr32, 5, SrcAddrReg), FrameIdx);
-
- // Store the value into a temporary stack slot...
- addDirectMem(BuildMI(BB, StoreOpcode, 5), SrcAddrReg).addReg(SrcReg);
-
- // Perform the bswaps 32 bits at a time...
- unsigned TmpReg1 = makeAnotherReg(Type::UIntTy);
- unsigned TmpReg2 = makeAnotherReg(Type::UIntTy);
- addDirectMem(BuildMI(BB, X86::MOVmr32, 4, TmpReg1), SrcAddrReg);
- BuildMI(BB, X86::BSWAPr32, 1, TmpReg2).addReg(TmpReg1);
- unsigned Offset = (Ty == Type::DoubleTy) << 2;
- addRegOffset(BuildMI(BB, X86::MOVrm32, 5),
- DestAddrReg, Offset).addReg(TmpReg2);
-
- if (Ty == Type::DoubleTy) { // Swap the other 32 bits of a double value...
- TmpReg1 = makeAnotherReg(Type::UIntTy);
- TmpReg2 = makeAnotherReg(Type::UIntTy);
-
- addRegOffset(BuildMI(BB, X86::MOVmr32, 4, TmpReg1), SrcAddrReg, 4);
- BuildMI(BB, X86::BSWAPr32, 1, TmpReg2).addReg(TmpReg1);
- unsigned Offset = (Ty == Type::DoubleTy) << 2;
- addDirectMem(BuildMI(BB, X86::MOVrm32, 5), DestAddrReg).addReg(TmpReg2);
- }
-}
-
-
/// visitStoreInst - Implement LLVM store instructions in terms of the x86 'mov'
/// instruction.
///
void ISel::visitStoreInst(StoreInst &I) {
- bool isLittleEndian = TM.getTargetData().isLittleEndian();
- bool hasLongPointers = TM.getTargetData().getPointerSize() == 8;
unsigned ValReg = getReg(I.getOperand(0));
unsigned AddressReg = getReg(I.getOperand(1));
-
- unsigned Class = getClassB(I.getOperand(0)->getType());
+
+ const Type *ValTy = I.getOperand(0)->getType();
+ unsigned Class = getClassB(ValTy);
switch (Class) {
case cLong:
- if (isLittleEndian) {
- addDirectMem(BuildMI(BB, X86::MOVrm32, 1+4), AddressReg).addReg(ValReg);
- addRegOffset(BuildMI(BB, X86::MOVrm32, 1+4),
- AddressReg, 4).addReg(ValReg+1);
- } else {
- unsigned T1 = makeAnotherReg(Type::IntTy);
- unsigned T2 = makeAnotherReg(Type::IntTy);
- EmitByteSwap(T1, ValReg , cInt);
- EmitByteSwap(T2, ValReg+1, cInt);
- addDirectMem(BuildMI(BB, X86::MOVrm32, 1+4), AddressReg).addReg(T2);
- addRegOffset(BuildMI(BB, X86::MOVrm32, 1+4), AddressReg, 4).addReg(T1);
- }
+ addDirectMem(BuildMI(BB, X86::MOVrm32, 1+4), AddressReg).addReg(ValReg);
+ addRegOffset(BuildMI(BB, X86::MOVrm32, 1+4), AddressReg,4).addReg(ValReg+1);
return;
- case cFP:
- doFPStore(I.getOperand(0)->getType(), AddressReg, ValReg);
+ case cFP: {
+ unsigned StoreOpcode = ValTy == Type::FloatTy ? X86::FSTr32 : X86::FSTr64;
+ addDirectMem(BuildMI(BB, StoreOpcode, 5), AddressReg).addReg(ValReg);
return;
+ }
case cInt: case cShort: case cByte:
break; // Integers of various sizes handled below
default: assert(0 && "Unknown memory class!");
}
- if (!isLittleEndian && hasLongPointers &&
- isa<PointerType>(I.getOperand(0)->getType())) {
- unsigned R = makeAnotherReg(Type::UIntTy);
- BuildMI(BB, X86::ADDri32, 2, R).addReg(AddressReg).addZImm(4);
- AddressReg = R;
- }
-
- if (!isLittleEndian && Class != cByte) {
- unsigned R = makeAnotherReg(I.getOperand(0)->getType());
- EmitByteSwap(R, ValReg, Class);
- ValReg = R;
- }
-
static const unsigned Opcode[] = { X86::MOVrm8, X86::MOVrm16, X86::MOVrm32 };
addDirectMem(BuildMI(BB, Opcode[Class], 1+4), AddressReg).addReg(ValReg);
}
generated by cgit v1.1 at 2024-12-26 00:56:26 +0000