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Remove the hack that turned an {S,U}MUL_LOHI with an unused high

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result into a MUL late in the X86 codegen process. ISD::MUL is
once again Legal on X86, so this is no longer needed. And, the
hack was suboptimal; see PR1874 for details.

llvm-svn: 47567
This commit is contained in:
Dan Gohman 2008-02-25 21:57:04 +00:00
parent afd0e4bad3
commit 1914fa6932
1 changed files with 0 additions and 9 deletions
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9
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -1224,15 +1224,6 @@ SDNode *X86DAGToDAGISel::Select(SDOperand N) {
SDOperand N0 = Node->getOperand(0); SDOperand N0 = Node->getOperand(0);
SDOperand N1 = Node->getOperand(1); SDOperand N1 = Node->getOperand(1);
// There are several forms of IMUL that just return the low part and
// don't have fixed-register operands. If we don't need the high part,
// use these instead. They can be selected with the generated ISel code.
if (NVT != MVT::i8 &&
N.getValue(1).use_empty()) {
N = CurDAG->getNode(ISD::MUL, NVT, N0, N1);
break;
}
bool isSigned = Opcode == ISD::SMUL_LOHI; bool isSigned = Opcode == ISD::SMUL_LOHI;
if (!isSigned) if (!isSigned)
switch (NVT) { switch (NVT) {