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Commit a small improvement that is already in the x86 and ia64 backends to

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not generate unnecessary register copies.  This improves compile time by
2-5% depending on the test.

llvm-svn: 22210
This commit is contained in:
Nate Begeman 2005-06-14 03:55:23 +00:00
parent 202eb6ff93
commit 9bb1be2eec
1 changed files with 5 additions and 0 deletions
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5
lib/Target/PowerPC/PPC32ISelPattern.cpp
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@ -1572,6 +1572,11 @@ unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
SDNode *Node = N.Val;
MVT::ValueType DestType = N.getValueType();
if (Node->getOpcode() == ISD::CopyFromReg &&
MRegisterInfo::isVirtualRegister(cast<RegSDNode>(Node)->getReg()))
// Just use the specified register as our input.
return cast<RegSDNode>(Node)->getReg();
unsigned &Reg = ExprMap[N];
if (Reg) return Reg;