diff options
| author | Nick Lewycky <nicholas@mxc.ca> | 2007-08-06 20:04:16 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2007-08-06 20:04:16 +0000 |
| commit | f947b3edb5a2dd687fe65dcc38afebeeef811762 (patch) | |
| tree | c8edb25645a2774a29ae452f5c89c61ab1417eeb | |
| parent | 450770de6547855c84b1af9d225f3bf3b8a70e93 (diff) | |
It's safe to fold not of fcmp.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40870 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 11 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/not-fcmp.ll | 10 |
2 files changed, 18 insertions, 3 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 15dec4fbcf..d8df139efa 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -4134,12 +4134,17 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) { if (ConstantInt *RHS = dyn_cast<ConstantInt>(Op1)) { - // xor (icmp A, B), true = not (icmp A, B) = !icmp A, B - if (ICmpInst *ICI = dyn_cast<ICmpInst>(Op0)) - if (RHS == ConstantInt::getTrue() && ICI->hasOneUse()) + // xor (cmp A, B), true = not (cmp A, B) = !cmp A, B + if (RHS == ConstantInt::getTrue() && Op0->hasOneUse()) { + if (ICmpInst *ICI = dyn_cast<ICmpInst>(Op0)) return new ICmpInst(ICI->getInversePredicate(), ICI->getOperand(0), ICI->getOperand(1)); + if (FCmpInst *FCI = dyn_cast<FCmpInst>(Op0)) + return new FCmpInst(FCI->getInversePredicate(), + FCI->getOperand(0), FCI->getOperand(1)); + } + if (BinaryOperator *Op0I = dyn_cast<BinaryOperator>(Op0)) { // ~(c-X) == X-c-1 == X+(-c-1) if (Op0I->getOpcode() == Instruction::Sub && RHS->isAllOnesValue()) diff --git a/test/Transforms/InstCombine/not-fcmp.ll b/test/Transforms/InstCombine/not-fcmp.ll new file mode 100644 index 0000000000..4560419a35 --- /dev/null +++ b/test/Transforms/InstCombine/not-fcmp.ll @@ -0,0 +1,10 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep "fcmp uge" +; PR1570 + +define i1 @f(float %X, float %Y) { +entry: + %tmp3 = fcmp olt float %X, %Y ; <i1> [#uses=1] + %toBoolnot5 = xor i1 %tmp3, true ; <i1> [#uses=1] + ret i1 %toBoolnot5 +} + |