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| author | Chris Lattner <sabre@nondot.org> | 2005-04-10 04:33:08 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-04-10 04:33:08 +0000 |
| commit | 45278e37eb9823ceabdaab6b27dabf3b5dcdcede (patch) | |
| tree | 5ede353bb38e59fa411d9f0178373b9cb94d02b3 /lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | edeecfcbd5ae3fe6d7e65107203a93ed196aaf1b (diff) | |
Fold zext_inreg(zextload), likewise for sext's
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21204 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 7cf89144c3..6b94adf1d8 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1101,6 +1101,12 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1, return N1; } + // If we are (zero|sign) extending a [zs]extload, return just the load. + if ((N1.getOpcode() == ISD::ZEXTLOAD && Opcode == ISD::ZERO_EXTEND_INREG) || + (N1.getOpcode() == ISD::SEXTLOAD && Opcode == ISD::SIGN_EXTEND_INREG)) + if (cast<MVTSDNode>(N1)->getExtraValueType() <= EVT) + return N1; + // If we are extending the result of a setcc, and we already know the // contents of the top bits, eliminate the extension. if (N1.getOpcode() == ISD::SETCC) |