diff options
| author | Shuxin Yang <shuxin.llvm@gmail.com> | 2013-02-02 00:22:03 +0000 |
|---|---|---|
| committer | Shuxin Yang <shuxin.llvm@gmail.com> | 2013-02-02 00:22:03 +0000 |
| commit | 98b93e5a94f69f6c7b12152a98455f501db1895d (patch) | |
| tree | a5d977bf85f01961747c026c62783878b8ac0de3 /lib/CodeGen | |
| parent | 7650d9b893b83b6261d1bbc892464aa9d61cc23f (diff) | |
| download | external_llvm-98b93e5a94f69f6c7b12152a98455f501db1895d.zip external_llvm-98b93e5a94f69f6c7b12152a98455f501db1895d.tar.gz external_llvm-98b93e5a94f69f6c7b12152a98455f501db1895d.tar.bz2 | |
rdar://13126763
Fix a bug in DAGCombine. The symptom is mistakenly optimizing expression
"x + x*x" into "x * 3.0".
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174239 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index a82410a..79ec227 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -5832,13 +5832,6 @@ SDValue DAGCombiner::visitFADD(SDNode *N) { N1, NewCFP); } - // (fadd (fadd x, x), x) -> (fmul 3.0, x) - if (!CFP00 && !CFP01 && N0.getOperand(0) == N0.getOperand(1) && - N0.getOperand(0) == N1) { - return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT, - N1, DAG.getConstantFP(3.0, VT)); - } - // (fadd (fmul c, x), (fadd x, x)) -> (fmul c+2, x) if (CFP00 && !CFP01 && N1.getOpcode() == ISD::FADD && N1.getOperand(0) == N1.getOperand(1) && @@ -5884,12 +5877,6 @@ SDValue DAGCombiner::visitFADD(SDNode *N) { N0, NewCFP); } - // (fadd x, (fadd x, x)) -> (fmul 3.0, x) - if (!CFP10 && !CFP11 && N1.getOperand(0) == N1.getOperand(1) && - N1.getOperand(0) == N0) { - return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT, - N0, DAG.getConstantFP(3.0, VT)); - } // (fadd (fadd x, x), (fmul c, x)) -> (fmul c+2, x) if (CFP10 && !CFP11 && N1.getOpcode() == ISD::FADD && @@ -5914,6 +5901,26 @@ SDValue DAGCombiner::visitFADD(SDNode *N) { } } + if (N0.getOpcode() == ISD::FADD) { + ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N0.getOperand(0)); + // (fadd (fadd x, x), x) -> (fmul 3.0, x) + if (!CFP && N0.getOperand(0) == N0.getOperand(1) && + (N0.getOperand(0) == N1)) { + return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT, + N1, DAG.getConstantFP(3.0, VT)); + } + } + + if (N1.getOpcode() == ISD::FADD) { + ConstantFPSDNode *CFP10 = dyn_cast<ConstantFPSDNode>(N1.getOperand(0)); + // (fadd x, (fadd x, x)) -> (fmul 3.0, x) + if (!CFP10 && N1.getOperand(0) == N1.getOperand(1) && + N1.getOperand(0) == N0) { + return DAG.getNode(ISD::FMUL, N->getDebugLoc(), VT, + N0, DAG.getConstantFP(3.0, VT)); + } + } + // (fadd (fadd x, x), (fadd x, x)) -> (fmul 4.0, x) if (N0.getOpcode() == ISD::FADD && N1.getOpcode() == ISD::FADD && N0.getOperand(0) == N0.getOperand(1) && |