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this logic is broken for trunc to bool, replace the folding logic for trunc

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completely, as it is trivial.  We should probably do this for the rest of the
cast operations.  This fixes ConstProp/2006-12-01-TruncBoolBug.ll.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32081 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-12-01 19:22:41 +00:00
parent 68329b2187
commit 5be662505e
1 changed files with 8 additions and 5 deletions
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13
lib/VMCore/ConstantFold.cpp
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@ -860,10 +860,10 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
// We actually have to do a cast now, but first, we might need to fix up
// the value of the operand.
switch (opc) {
case Instruction::PtrToInt:
case Instruction::FPTrunc:
case Instruction::Trunc:
case Instruction::FPExt:
break; // floating point input & output, no fixup needed
break;
case Instruction::FPToUI: {
ConstRules &Rules = ConstRules::get(V, V);
V = Rules.castToULong(V); // make sure we get an unsigned value first
@ -891,9 +891,12 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
V = ConstantInt::get(SrcTy->getSignedVersion(),
cast<ConstantIntegral>(V)->getSExtValue());
break;
case Instruction::PtrToInt:
break;
case Instruction::Trunc:
// We just handle trunc directly here. The code below doesn't work for
// trunc to bool.
if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
return ConstantIntegral::get(DestTy, CI->getZExtValue());
return 0;
case Instruction::BitCast:
// Check to see if we are casting a pointer to an aggregate to a pointer to
// the first element. If so, return the appropriate GEP instruction.