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| author | Chris Lattner <sabre@nondot.org> | 2006-01-12 20:22:43 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-01-12 20:22:43 +0000 |
| commit | 4aafb4ff92ee6b5372aaaa51845445f2418a7fd1 (patch) | |
| tree | 3564ce2e262a72451098595bcc699e6806f7c734 | |
| parent | 77e9043b84d465ac2a2a0af3e8295cde11cc3836 (diff) | |
| download | external_llvm-4aafb4ff92ee6b5372aaaa51845445f2418a7fd1.zip external_llvm-4aafb4ff92ee6b5372aaaa51845445f2418a7fd1.tar.gz external_llvm-4aafb4ff92ee6b5372aaaa51845445f2418a7fd1.tar.bz2 | |
Add a simple missing fold to produce this:
subfic r3, r2, 33
instead of this:
subfic r2, r2, 32
addi r3, r2, 1
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25255 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index cb80e25..9203c81 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -696,6 +696,14 @@ SDOperand DAGCombiner::visitADD(SDNode *N) { return DAG.getNode(ISD::ADD, VT, N0.getOperand(0), DAG.getConstant(N1C->getValue()+N01C->getValue(), VT)); } + + // fold ((c1-A)+c2) -> (c1+c2)-A + if (N1C && N0.getOpcode() == ISD::SUB) + if (ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getOperand(0))) + return DAG.getNode(ISD::SUB, VT, + DAG.getConstant(N1C->getValue()+N0C->getValue(), VT), + N0.getOperand(1)); + // fold ((0-A) + B) -> B-A if (N0.getOpcode() == ISD::SUB && isa<ConstantSDNode>(N0.getOperand(0)) && cast<ConstantSDNode>(N0.getOperand(0))->isNullValue()) |