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Fold adds and subtracts of zero immediately, instead of waiting 

for dagcombine to do this.

llvm-svn: 51886
This commit is contained in:
Dan Gohman 2008-06-02 22:27:05 +00:00
parent 5793cbcf44
commit 057240f4f0
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -2115,10 +2115,12 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
break;
case ISD::OR:
case ISD::XOR:
case ISD::ADD:
case ISD::SUB:
assert(MVT::isInteger(VT) && N1.getValueType() == N2.getValueType() &&
N1.getValueType() == VT && "Binary operator types must match!");
// (X ^| 0) -> X. This commonly occurs when legalizing i64 values, so it's
// worth handling here.
// (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so
// it's worth handling here.
if (N2C && N2C->isNullValue())
return N1;
break;
@ -2128,8 +2130,6 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
case ISD::MULHS:
assert(MVT::isInteger(VT) && "This operator does not apply to FP types!");
// fall through
case ISD::ADD:
case ISD::SUB:
case ISD::MUL:
case ISD::SDIV:
case ISD::SREM: