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Constant fold SIGN_EXTEND_INREG with ashr not lshr.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47992 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-03-06 08:20:51 +00:00
parent 819a66cf25
commit 433f6f62ca
2 changed files with 15 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -2029,7 +2029,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
APInt Val = N1C->getAPIntValue();
unsigned FromBits = MVT::getSizeInBits(cast<VTSDNode>(N2)->getVT());
Val <<= Val.getBitWidth()-FromBits;
Val = Val.lshr(Val.getBitWidth()-FromBits);
Val = Val.ashr(Val.getBitWidth()-FromBits);
return getConstant(Val, VT);
}
break;