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fix PR5930, allowing the asmprinter to emit difference between

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two labels as a truncate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92455 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-01-03 18:33:18 +00:00
parent fa5dd977e4
commit d0592d3be6
2 changed files with 37 additions and 2 deletions
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10
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -819,7 +819,6 @@ void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
const TargetData *TD = TM.getTargetData();
unsigned Opcode = CE->getOpcode();
switch (Opcode) {
case Instruction::Trunc:
case Instruction::ZExt:
case Instruction::SExt:
case Instruction::FPTrunc:
@ -865,7 +864,6 @@ void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
return EmitConstantValueOnly(Op);
}
case Instruction::PtrToInt: {
// Support only foldable casts to/from pointers that can be eliminated by
// changing the pointer to the appropriately sized integer type.
@ -887,6 +885,14 @@ void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
O << ") & " << S.str() << ')';
break;
}
case Instruction::Trunc:
// We emit the value and depend on the assembler to truncate the generated
// expression properly. This is important for differences between
// blockaddress labels. Since the two labels are in the same function, it
// is reasonable to treat their delta as a 32-bit value.
return EmitConstantValueOnly(CE->getOperand(0));
case Instruction::Add:
case Instruction::Sub:
case Instruction::And: