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reduce indentation and use early exits in AsmPrinter::EmitConstantValueOnly
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93290 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
3047384a0f
commit
fe0e7ed6b0
@ -807,130 +807,145 @@ void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
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// Print out the specified constant, without a storage class. Only the
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// constants valid in constant expressions can occur here.
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void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
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if (CV->isNullValue() || isa<UndefValue>(CV))
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if (CV->isNullValue() || isa<UndefValue>(CV)) {
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O << '0';
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else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
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return;
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}
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
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O << CI->getZExtValue();
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} else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
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return;
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}
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if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
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// This is a constant address for a global variable or function. Use the
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// name of the variable or function as the address value.
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O << Mang->getMangledName(GV);
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} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
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const TargetData *TD = TM.getTargetData();
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unsigned Opcode = CE->getOpcode();
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switch (Opcode) {
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case Instruction::ZExt:
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case Instruction::SExt:
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case Instruction::FPTrunc:
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case Instruction::FPExt:
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case Instruction::UIToFP:
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case Instruction::SIToFP:
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case Instruction::FPToUI:
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case Instruction::FPToSI:
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llvm_unreachable("FIXME: Don't support this constant cast expr");
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case Instruction::GetElementPtr: {
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// generate a symbolic expression for the byte address
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const Constant *ptrVal = CE->getOperand(0);
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SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
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if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
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idxVec.size())) {
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// Truncate/sext the offset to the pointer size.
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if (TD->getPointerSizeInBits() != 64) {
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int SExtAmount = 64-TD->getPointerSizeInBits();
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Offset = (Offset << SExtAmount) >> SExtAmount;
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}
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if (Offset)
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O << '(';
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EmitConstantValueOnly(ptrVal);
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if (Offset > 0)
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O << ") + " << Offset;
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else if (Offset < 0)
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O << ") - " << -Offset;
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} else {
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EmitConstantValueOnly(ptrVal);
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}
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break;
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}
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case Instruction::BitCast:
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return EmitConstantValueOnly(CE->getOperand(0));
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case Instruction::IntToPtr: {
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// Handle casts to pointers by changing them into casts to the appropriate
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// integer type. This promotes constant folding and simplifies this code.
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Constant *Op = CE->getOperand(0);
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Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
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false/*ZExt*/);
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return EmitConstantValueOnly(Op);
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}
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case Instruction::PtrToInt: {
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// Support only foldable casts to/from pointers that can be eliminated by
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// changing the pointer to the appropriately sized integer type.
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Constant *Op = CE->getOperand(0);
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const Type *Ty = CE->getType();
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// We can emit the pointer value into this slot if the slot is an
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// integer slot greater or equal to the size of the pointer.
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if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
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return EmitConstantValueOnly(Op);
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O << "((";
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EmitConstantValueOnly(Op);
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APInt ptrMask =
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APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
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SmallString<40> S;
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ptrMask.toStringUnsigned(S);
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O << ") & " << S.str() << ')';
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break;
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}
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case Instruction::Trunc:
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// We emit the value and depend on the assembler to truncate the generated
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// expression properly. This is important for differences between
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// blockaddress labels. Since the two labels are in the same function, it
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// is reasonable to treat their delta as a 32-bit value.
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return EmitConstantValueOnly(CE->getOperand(0));
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case Instruction::Add:
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case Instruction::Sub:
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case Instruction::And:
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case Instruction::Or:
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case Instruction::Xor:
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O << '(';
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EmitConstantValueOnly(CE->getOperand(0));
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O << ')';
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switch (Opcode) {
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case Instruction::Add:
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O << " + ";
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break;
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case Instruction::Sub:
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O << " - ";
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break;
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case Instruction::And:
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O << " & ";
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break;
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case Instruction::Or:
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O << " | ";
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break;
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case Instruction::Xor:
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O << " ^ ";
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break;
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default:
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break;
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}
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O << '(';
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EmitConstantValueOnly(CE->getOperand(1));
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O << ')';
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break;
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default:
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llvm_unreachable("Unsupported operator!");
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}
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} else if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
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return;
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}
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if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
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GetBlockAddressSymbol(BA)->print(O, MAI);
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} else {
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return;
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}
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const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
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if (CE == 0) {
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llvm_unreachable("Unknown constant value!");
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O << '0';
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return;
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}
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switch (CE->getOpcode()) {
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case Instruction::ZExt:
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case Instruction::SExt:
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case Instruction::FPTrunc:
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case Instruction::FPExt:
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case Instruction::UIToFP:
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case Instruction::SIToFP:
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case Instruction::FPToUI:
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case Instruction::FPToSI:
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default:
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llvm_unreachable("FIXME: Don't support this constant cast expr");
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case Instruction::GetElementPtr: {
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// generate a symbolic expression for the byte address
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const TargetData *TD = TM.getTargetData();
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const Constant *ptrVal = CE->getOperand(0);
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SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
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int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
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idxVec.size());
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if (Offset == 0)
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return EmitConstantValueOnly(ptrVal);
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// Truncate/sext the offset to the pointer size.
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if (TD->getPointerSizeInBits() != 64) {
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int SExtAmount = 64-TD->getPointerSizeInBits();
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Offset = (Offset << SExtAmount) >> SExtAmount;
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}
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if (Offset)
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O << '(';
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EmitConstantValueOnly(ptrVal);
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if (Offset > 0)
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O << ") + " << Offset;
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else
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O << ") - " << -Offset;
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return;
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}
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case Instruction::BitCast:
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return EmitConstantValueOnly(CE->getOperand(0));
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case Instruction::IntToPtr: {
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// Handle casts to pointers by changing them into casts to the appropriate
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// integer type. This promotes constant folding and simplifies this code.
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const TargetData *TD = TM.getTargetData();
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Constant *Op = CE->getOperand(0);
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Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
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false/*ZExt*/);
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return EmitConstantValueOnly(Op);
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}
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case Instruction::PtrToInt: {
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// Support only foldable casts to/from pointers that can be eliminated by
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// changing the pointer to the appropriately sized integer type.
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Constant *Op = CE->getOperand(0);
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const Type *Ty = CE->getType();
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const TargetData *TD = TM.getTargetData();
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// We can emit the pointer value into this slot if the slot is an
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// integer slot greater or equal to the size of the pointer.
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if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
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return EmitConstantValueOnly(Op);
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O << "((";
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EmitConstantValueOnly(Op);
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APInt ptrMask =
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APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
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SmallString<40> S;
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ptrMask.toStringUnsigned(S);
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O << ") & " << S.str() << ')';
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return;
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}
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case Instruction::Trunc:
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// We emit the value and depend on the assembler to truncate the generated
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// expression properly. This is important for differences between
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// blockaddress labels. Since the two labels are in the same function, it
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// is reasonable to treat their delta as a 32-bit value.
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return EmitConstantValueOnly(CE->getOperand(0));
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case Instruction::Add:
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case Instruction::Sub:
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case Instruction::And:
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case Instruction::Or:
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case Instruction::Xor:
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O << '(';
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EmitConstantValueOnly(CE->getOperand(0));
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O << ')';
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switch (CE->getOpcode()) {
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case Instruction::Add:
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O << " + ";
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break;
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case Instruction::Sub:
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O << " - ";
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break;
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case Instruction::And:
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O << " & ";
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break;
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case Instruction::Or:
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O << " | ";
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break;
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case Instruction::Xor:
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O << " ^ ";
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break;
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default:
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break;
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}
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O << '(';
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EmitConstantValueOnly(CE->getOperand(1));
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O << ')';
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break;
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}
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}
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