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| author | Owen Anderson <resistor@mac.com> | 2013-05-09 22:27:13 +0000 |
|---|---|---|
| committer | Owen Anderson <resistor@mac.com> | 2013-05-09 22:27:13 +0000 |
| commit | 58dcd200b7f0ea01160b6159e0363cc96b1b83d9 (patch) | |
| tree | 00da3ebfab570918388b978ff1163604411376d7 /lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | 2c694171a597a90c1b7c95b8704ff0d010f9ce3c (diff) | |
| download | llvm-58dcd200b7f0ea01160b6159e0363cc96b1b83d9.tar.gz llvm-58dcd200b7f0ea01160b6159e0363cc96b1b83d9.tar.bz2 llvm-58dcd200b7f0ea01160b6159e0363cc96b1b83d9.tar.xz | |
Teach SelectionDAG to constant fold all-constant FMA nodes the same way that it constant folds FADD, FMUL, etc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181555 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 15235c8ac3..f2c512dec7 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -3261,6 +3261,21 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, // Perform various simplifications. ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode()); switch (Opcode) { + case ISD::FMA: { + ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1); + ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2); + ConstantFPSDNode *N3CFP = dyn_cast<ConstantFPSDNode>(N3); + if (N1CFP && N2CFP && N3CFP) { + APFloat V1 = N1CFP->getValueAPF(); + const APFloat &V2 = N2CFP->getValueAPF(); + const APFloat &V3 = N3CFP->getValueAPF(); + APFloat::opStatus s = + V1.fusedMultiplyAdd(V2, V3, APFloat::rmNearestTiesToEven); + if (s != APFloat::opInvalidOp) + return getConstantFP(V1, VT); + } + break; + } case ISD::CONCAT_VECTORS: // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to // one big BUILD_VECTOR. |