diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index d9b15de1af..2167144fc1 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -4744,7 +4744,7 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) { if (Instruction *NV = FoldOpIntoPhi(I)) return NV; break; - case Instruction::Select: + case Instruction::Select: { // If either operand of the select is a constant, we can fold the // comparison into the select arms, which will cause one to be // constant folded and the select turned into a bitwise or. @@ -4771,6 +4771,16 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) { return new SelectInst(LHSI->getOperand(0), Op1, Op2); break; } + case Instruction::Malloc: + // If we have (malloc != null), and if the malloc has a single use, we + // can assume it is successful and remove the malloc. + if (LHSI->hasOneUse() && isa<ConstantPointerNull>(RHSC)) { + AddToWorkList(LHSI); + return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty, + !isTrueWhenEqual(I))); + } + break; + } } // If we can optimize a 'icmp GEP, P' or 'icmp P, GEP', do so now. |