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allow the offset of a preinc'd load to be the low-part of a global. This

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produces this clever code:

_millisecs:
        lis r2, ha16(_Time.1182)
        lwzu r3, lo16(_Time.1182)(r2)
        lwz r2, 4(r2)
        addic r4, r2, 1
        addze r3, r3
        blr

instead of this:

_millisecs:
        lis r2, ha16(_Time.1182)
        la r3, lo16(_Time.1182)(r2)
        lwz r2, lo16(_Time.1182)(r2)
        lwz r3, 4(r3)
        addic r4, r3, 1
        addze r3, r2
        blr

for:

long %millisecs() {
        %tmp = load long* %Time.1182            ; <long> [#uses=1]
        %tmp1 = add long %tmp, 1                ; <long> [#uses=1]
        ret long %tmp1
}

llvm-svn: 31673
This commit is contained in:
Chris Lattner 2006-11-11 04:53:30 +00:00
parent 3d48461071
commit 1409347c13
1 changed files with 2 additions and 1 deletions
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3
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -856,7 +856,8 @@ SDNode *PPCDAGToDAGISel::Select(SDOperand Op) {
}
SDOperand Offset = LD->getOffset();
if (isa<ConstantSDNode>(Offset)) {
if (isa<ConstantSDNode>(Offset) ||
Offset.getOpcode() == ISD::TargetGlobalAddress) {
SDOperand Chain = LD->getChain();
SDOperand Base = LD->getBasePtr();
AddToISelQueue(Chain);