diff options
| -rw-r--r-- | lib/Analysis/InstructionSimplify.cpp | 9 | ||||
| -rw-r--r-- | test/Transforms/InstSimplify/2010-12-20-I1Arithmetic.ll | 22 |
2 files changed, 28 insertions, 3 deletions
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp index 157193d5d3..f35d50586e 100644 --- a/lib/Analysis/InstructionSimplify.cpp +++ b/lib/Analysis/InstructionSimplify.cpp @@ -492,7 +492,8 @@ static Value *SimplifyAddInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW, /// i1 add -> xor. if (MaxRecurse && Op0->getType()->isIntegerTy(1)) - return SimplifyXorInst(Op0, Op1, TD, DT, MaxRecurse-1); + if (Value *V = SimplifyXorInst(Op0, Op1, TD, DT, MaxRecurse-1)) + return V; // Try some generic simplifications for associative operations. if (Value *V = SimplifyAssociativeBinOp(Instruction::Add, Op0, Op1, TD, DT, @@ -555,7 +556,8 @@ static Value *SimplifySubInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW, /// i1 sub -> xor. if (MaxRecurse && Op0->getType()->isIntegerTy(1)) - return SimplifyXorInst(Op0, Op1, TD, DT, MaxRecurse-1); + if (Value *V = SimplifyXorInst(Op0, Op1, TD, DT, MaxRecurse-1)) + return V; // Mul distributes over Sub. Try some generic simplifications based on this. if (Value *V = FactorizeBinOp(Instruction::Sub, Op0, Op1, Instruction::Mul, @@ -608,7 +610,8 @@ static Value *SimplifyMulInst(Value *Op0, Value *Op1, const TargetData *TD, /// i1 mul -> and. if (MaxRecurse && Op0->getType()->isIntegerTy(1)) - return SimplifyAndInst(Op0, Op1, TD, DT, MaxRecurse-1); + if (Value *V = SimplifyAndInst(Op0, Op1, TD, DT, MaxRecurse-1)) + return V; // Try some generic simplifications for associative operations. if (Value *V = SimplifyAssociativeBinOp(Instruction::Mul, Op0, Op1, TD, DT, diff --git a/test/Transforms/InstSimplify/2010-12-20-I1Arithmetic.ll b/test/Transforms/InstSimplify/2010-12-20-I1Arithmetic.ll new file mode 100644 index 0000000000..8b795eaaab --- /dev/null +++ b/test/Transforms/InstSimplify/2010-12-20-I1Arithmetic.ll @@ -0,0 +1,22 @@ +; RUN: opt < %s -instsimplify -S | FileCheck %s + +define i1 @add(i1 %x) { +; CHECK: @add + %z = add i1 %x, %x + ret i1 %z +; CHECK: ret i1 false +} + +define i1 @sub(i1 %x) { +; CHECK: @sub + %z = sub i1 false, %x + ret i1 %z +; CHECK: ret i1 %x +} + +define i1 @mul(i1 %x) { +; CHECK: @mul + %z = mul i1 %x, %x + ret i1 %z +; CHECK: ret i1 %x +} |