diff options
| -rw-r--r-- | lib/Analysis/InstructionSimplify.cpp | 10 | ||||
| -rw-r--r-- | test/Transforms/InstSimplify/2010-12-20-Reassociate.ll | 4 |
2 files changed, 5 insertions, 9 deletions
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp index fcbc6d5..a907150 100644 --- a/lib/Analysis/InstructionSimplify.cpp +++ b/lib/Analysis/InstructionSimplify.cpp @@ -804,11 +804,11 @@ static Value *SimplifyDiv(unsigned Opcode, Value *Op0, Value *Op1, Value *X = 0, *Y = 0; if (match(Op0, m_Mul(m_Value(X), m_Value(Y))) && (X == Op1 || Y == Op1)) { if (Y != Op1) std::swap(X, Y); // Ensure expression is (X * Y) / Y, Y = Op1 - BinaryOperator *Mul = cast<BinaryOperator>(Op0); - // If the Mul knows it does not overflow, then we are good to go. - if ((isSigned && Mul->hasNoSignedWrap()) || - (!isSigned && Mul->hasNoUnsignedWrap())) - return X; +// BinaryOperator *Mul = cast<BinaryOperator>(Op0); +// // If the Mul knows it does not overflow, then we are good to go. +// if ((isSigned && Mul->hasNoSignedWrap()) || +// (!isSigned && Mul->hasNoUnsignedWrap())) +// return X; // If X has the form X = A / Y then X * Y cannot overflow. if (BinaryOperator *Div = dyn_cast<BinaryOperator>(X)) if (Div->getOpcode() == Opcode && Div->getOperand(1) == Y) diff --git a/test/Transforms/InstSimplify/2010-12-20-Reassociate.ll b/test/Transforms/InstSimplify/2010-12-20-Reassociate.ll index 928442a..c0ae257 100644 --- a/test/Transforms/InstSimplify/2010-12-20-Reassociate.ll +++ b/test/Transforms/InstSimplify/2010-12-20-Reassociate.ll @@ -92,12 +92,10 @@ define i32 @sub3(i32 %x, i32 %y) { } define i32 @sdiv1(i32 %x, i32 %y) { -; CHECK: @sdiv1 ; (no overflow X * Y) / Y -> X %mul = mul nsw i32 %x, %y %r = sdiv i32 %mul, %y ret i32 %r -; CHECK: ret i32 %x } define i32 @sdiv2(i32 %x, i32 %y) { @@ -138,12 +136,10 @@ define i32 @sdiv5(i32 %x, i32 %y) { } define i32 @udiv1(i32 %x, i32 %y) { -; CHECK: @udiv1 ; (no overflow X * Y) / Y -> X %mul = mul nuw i32 %x, %y %r = udiv i32 %mul, %y ret i32 %r -; CHECK: ret i32 %x } define i32 @udiv2(i32 %x, i32 %y) { |