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Like the comment says, prefer to use the implicit add done by [r+r] addressing

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modes than emitting an explicit add and using a base of r0.  This implements
Regression/CodeGen/PowerPC/mem-rr-addr-mode.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27068 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-24 17:58:06 +00:00
parent 33e71b69e1
commit 54e869e18c
1 changed files with 14 additions and 4 deletions
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18
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -616,11 +616,21 @@ bool PPCDAGToDAGISel::SelectAddrIdxOnly(SDOperand N, SDOperand &Base,
// Check to see if we can easily represent this as an [r+r] address. This
// will fail if it thinks that the address is more profitably represented as
// reg+imm, e.g. where imm = 0.
if (!SelectAddrIdx(N, Base, Index)) {
// Nope, do it the hard way.
Base = CurDAG->getRegister(PPC::R0, MVT::i32);
Index = N;
if (SelectAddrIdx(N, Base, Index))
return true;
// If the operand is an addition, always emit this as [r+r], since this is
// better (for code size, and execution, as the memop does the add for free)
// than emitting an explicit add.
if (N.getOpcode() == ISD::ADD) {
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
}
// Otherwise, do it the hard way, using R0 as the base register.
Base = CurDAG->getRegister(PPC::R0, MVT::i32);
Index = N;
return true;
}