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| author | Dan Gohman <gohman@apple.com> | 2010-06-18 01:05:21 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-06-18 01:05:21 +0000 |
| commit | 8a7f7426eeb18fef58c3471db23fc829b67bc350 (patch) | |
| tree | c09b3eb1b448651efb494764ea9c9a6eeb843ed7 /lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | 4f46e14b8ab3861a8dbea14ed70cb9527ae24a06 (diff) | |
Fold the ShrinkDemandedOps pass into the regular DAGCombiner pass,
which is faster, simpler, and less surprising.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106263 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 49f31012a3..ca3746cdaf 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2474,10 +2474,18 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, VT.getVectorNumElements() == Operand.getValueType().getVectorNumElements()) && "Vector element count mismatch!"); + if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ANY_EXTEND) // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x) return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); + + // (ext (trunx x)) -> x + if (OpOpcode == ISD::TRUNCATE) { + SDValue OpOp = Operand.getNode()->getOperand(0); + if (OpOp.getValueType() == VT) + return OpOp; + } break; case ISD::TRUNCATE: assert(VT.isInteger() && Operand.getValueType().isInteger() && |