diff options
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/VMCore/ConstantFolding.cpp | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/llvm/lib/VMCore/ConstantFolding.cpp b/llvm/lib/VMCore/ConstantFolding.cpp index 79f0f577420..48d84e5ac54 100644 --- a/llvm/lib/VMCore/ConstantFolding.cpp +++ b/llvm/lib/VMCore/ConstantFolding.cpp @@ -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. |
