diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index c815686..77df4b4 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -17983,8 +17983,7 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) { // (fsub A, 0) -> A if (N1CFP && N1CFP->isZero()) { - if (!N1CFP->isNegative() || Options.NoSignedZerosFPMath || - Flags.hasNoSignedZeros()) { + if (!N1CFP->isNegative() || Flags.hasNoSignedZeros()) { return N0; } } @@ -17997,8 +17996,7 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) { // (fsub -0.0, N1) -> -N1 if (N0CFP && N0CFP->isZero()) { - if (N0CFP->isNegative() || - (Options.NoSignedZerosFPMath || Flags.hasNoSignedZeros())) { + if (N0CFP->isNegative() || Flags.hasNoSignedZeros()) { // We cannot replace an FSUB(+-0.0,X) with FNEG(X) when denormals are // flushed to zero, unless all users treat denorms as zero (DAZ). // FIXME: This transform will change the sign of a NaN and the behavior @@ -18014,8 +18012,7 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) { } } - if ((Options.NoSignedZerosFPMath || - (Flags.hasAllowReassociation() && Flags.hasNoSignedZeros())) && + if (Flags.hasAllowReassociation() && Flags.hasNoSignedZeros() && N1.getOpcode() == ISD::FADD) { // X - (X + Y) -> -Y if (N0 == N1->getOperand(0)) |