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| author | Akira Hatanaka <ahatanaka@mips.com> | 2011-12-20 22:25:50 +0000 |
|---|---|---|
| committer | Akira Hatanaka <ahatanaka@mips.com> | 2011-12-20 22:25:50 +0000 |
| commit | 990d639f552308220dae062661fa3ba074d7150c (patch) | |
| tree | c853dd48c43251ae391da17e542170bf25ea7154 /lib/Target/Mips/MipsISelDAGToDAG.cpp | |
| parent | 52346e964ff1108729c2b8990b859c10f09a1822 (diff) | |
| download | external_llvm-990d639f552308220dae062661fa3ba074d7150c.zip external_llvm-990d639f552308220dae062661fa3ba074d7150c.tar.gz external_llvm-990d639f552308220dae062661fa3ba074d7150c.tar.bz2 | |
Add code in MipsDAGToDAGISel for selecting constant +0.0.
MIPS64 can generate constant +0.0 with a single DMTC1 instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146999 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/Mips/MipsISelDAGToDAG.cpp')
| -rw-r--r-- | lib/Target/Mips/MipsISelDAGToDAG.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Target/Mips/MipsISelDAGToDAG.cpp b/lib/Target/Mips/MipsISelDAGToDAG.cpp index b33a4e6..8f3cb55 100644 --- a/lib/Target/Mips/MipsISelDAGToDAG.cpp +++ b/lib/Target/Mips/MipsISelDAGToDAG.cpp @@ -293,6 +293,12 @@ SDNode* MipsDAGToDAGISel::Select(SDNode *Node) { case ISD::ConstantFP: { ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(Node); if (Node->getValueType(0) == MVT::f64 && CN->isExactlyValue(+0.0)) { + if (Subtarget.hasMips64()) { + SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl, + Mips::ZERO_64, MVT::i64); + return CurDAG->getMachineNode(Mips::DMTC1, dl, MVT::f64, Zero); + } + SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl, Mips::ZERO, MVT::i32); return CurDAG->getMachineNode(Mips::BuildPairF64, dl, MVT::f64, Zero, |