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author | Owen Anderson <resistor@mac.com> | 2012-08-13 23:32:49 +0000 |
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committer | Owen Anderson <resistor@mac.com> | 2012-08-13 23:32:49 +0000 |
commit | 7c626d30974c632ab500171ff185a24bcf2603bf (patch) | |
tree | c8376ef145853a72e22753cb83b46218bebf45a3 /lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
parent | 03e593efc65807dad7ca8807554584fcb89f40f1 (diff) | |
download | llvm-7c626d30974c632ab500171ff185a24bcf2603bf.tar.gz llvm-7c626d30974c632ab500171ff185a24bcf2603bf.tar.bz2 llvm-7c626d30974c632ab500171ff185a24bcf2603bf.tar.xz |
Add a roundToIntegral method to APFloat, which can be parameterized over various rounding modes. Use this to implement SelectionDAG constant folding of FFLOOR, FCEIL, and FTRUNC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161807 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
-rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 0f019ef716..4e29879bef 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -228,6 +228,9 @@ namespace { SDValue visitFP_EXTEND(SDNode *N); SDValue visitFNEG(SDNode *N); SDValue visitFABS(SDNode *N); + SDValue visitFCEIL(SDNode *N); + SDValue visitFTRUNC(SDNode *N); + SDValue visitFFLOOR(SDNode *N); SDValue visitBRCOND(SDNode *N); SDValue visitBR_CC(SDNode *N); SDValue visitLOAD(SDNode *N); @@ -1140,6 +1143,9 @@ SDValue DAGCombiner::visit(SDNode *N) { case ISD::FP_EXTEND: return visitFP_EXTEND(N); case ISD::FNEG: return visitFNEG(N); case ISD::FABS: return visitFABS(N); + case ISD::FFLOOR: return visitFFLOOR(N); + case ISD::FCEIL: return visitFCEIL(N); + case ISD::FTRUNC: return visitFTRUNC(N); case ISD::BRCOND: return visitBRCOND(N); case ISD::BR_CC: return visitBR_CC(N); case ISD::LOAD: return visitLOAD(N); @@ -6243,6 +6249,42 @@ SDValue DAGCombiner::visitFNEG(SDNode *N) { return SDValue(); } +SDValue DAGCombiner::visitFCEIL(SDNode *N) { + SDValue N0 = N->getOperand(0); + ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0); + EVT VT = N->getValueType(0); + + // fold (fceil c1) -> fceil(c1) + if (N0CFP && VT != MVT::ppcf128) + return DAG.getNode(ISD::FCEIL, N->getDebugLoc(), VT, N0); + + return SDValue(); +} + +SDValue DAGCombiner::visitFTRUNC(SDNode *N) { + SDValue N0 = N->getOperand(0); + ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0); + EVT VT = N->getValueType(0); + + // fold (ftrunc c1) -> ftrunc(c1) + if (N0CFP && VT != MVT::ppcf128) + return DAG.getNode(ISD::FTRUNC, N->getDebugLoc(), VT, N0); + + return SDValue(); +} + +SDValue DAGCombiner::visitFFLOOR(SDNode *N) { + SDValue N0 = N->getOperand(0); + ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0); + EVT VT = N->getValueType(0); + + // fold (ffloor c1) -> ffloor(c1) + if (N0CFP && VT != MVT::ppcf128) + return DAG.getNode(ISD::FFLOOR, N->getDebugLoc(), VT, N0); + + return SDValue(); +} + SDValue DAGCombiner::visitFABS(SDNode *N) { SDValue N0 = N->getOperand(0); ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0); |