diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 680f62fa91bc6..fd156fa7dd07d 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -8123,9 +8123,12 @@ SDValue DAGCombiner::visitFADDForFMACombine(SDNode *N) { } // More folding opportunities when target permits. - if ((AllowFusion || HasFMAD) && Aggressive) { + if (Aggressive) { // fold (fadd (fma x, y, (fmul u, v)), z) -> (fma x, y (fma u, v, z)) - if (N0.getOpcode() == PreferredFusedOpcode && + // FIXME: The UnsafeAlgebra flag should be propagated to FMA/FMAD, but FMF + // are currently only supported on binary nodes. + if (Options.UnsafeFPMath && + N0.getOpcode() == PreferredFusedOpcode && N0.getOperand(2).getOpcode() == ISD::FMUL && N0->hasOneUse() && N0.getOperand(2)->hasOneUse()) { return DAG.getNode(PreferredFusedOpcode, SL, VT, @@ -8137,7 +8140,10 @@ SDValue DAGCombiner::visitFADDForFMACombine(SDNode *N) { } // fold (fadd x, (fma y, z, (fmul u, v)) -> (fma y, z (fma u, v, x)) - if (N1->getOpcode() == PreferredFusedOpcode && + // FIXME: The UnsafeAlgebra flag should be propagated to FMA/FMAD, but FMF + // are currently only supported on binary nodes. + if (Options.UnsafeFPMath && + N1->getOpcode() == PreferredFusedOpcode && N1.getOperand(2).getOpcode() == ISD::FMUL && N1->hasOneUse() && N1.getOperand(2)->hasOneUse()) { return DAG.getNode(PreferredFusedOpcode, SL, VT, @@ -8367,10 +8373,13 @@ SDValue DAGCombiner::visitFSUBForFMACombine(SDNode *N) { } // More folding opportunities when target permits. - if ((AllowFusion || HasFMAD) && Aggressive) { + if (Aggressive) { // fold (fsub (fma x, y, (fmul u, v)), z) // -> (fma x, y (fma u, v, (fneg z))) - if (N0.getOpcode() == PreferredFusedOpcode && + // FIXME: The UnsafeAlgebra flag should be propagated to FMA/FMAD, but FMF + // are currently only supported on binary nodes. + if (Options.UnsafeFPMath && + N0.getOpcode() == PreferredFusedOpcode && N0.getOperand(2).getOpcode() == ISD::FMUL && N0->hasOneUse() && N0.getOperand(2)->hasOneUse()) { return DAG.getNode(PreferredFusedOpcode, SL, VT, @@ -8384,7 +8393,10 @@ SDValue DAGCombiner::visitFSUBForFMACombine(SDNode *N) { // fold (fsub x, (fma y, z, (fmul u, v))) // -> (fma (fneg y), z, (fma (fneg u), v, x)) - if (N1.getOpcode() == PreferredFusedOpcode && + // FIXME: The UnsafeAlgebra flag should be propagated to FMA/FMAD, but FMF + // are currently only supported on binary nodes. + if (Options.UnsafeFPMath && + N1.getOpcode() == PreferredFusedOpcode && N1.getOperand(2).getOpcode() == ISD::FMUL) { SDValue N20 = N1.getOperand(2).getOperand(0); SDValue N21 = N1.getOperand(2).getOperand(1); |