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Simplify store(bitconv(x)) to store(x). This allows us to compile this:

Browse Source 
void bar(double Y, double *X) {
  *X = Y;
}

to this:

bar:
        save -96, %o6, %o6
        st %i1, [%i2+4]
        st %i0, [%i2]
        restore %g0, %g0, %g0
        retl
        nop

instead of this:

bar:
        save -104, %o6, %o6
        st %i1, [%i6+-4]
        st %i0, [%i6+-8]
        ldd [%i6+-8], %f0
        std  %f0, [%i2]
        restore %g0, %g0, %g0
        retl
        nop

on sparcv8.

llvm-svn: 24983
This commit is contained in:
Chris Lattner 2005-12-23 05:48:07 +00:00
parent 20e6338732
commit 0637d38ec2
1 changed files with 5 additions and 0 deletions
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5
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2081,6 +2081,11 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
return SDOperand(N, 0);
}
// If this is a store of a bit convert, store the input value.
if (Value.getOpcode() == ISD::BIT_CONVERT)
return DAG.getNode(ISD::STORE, MVT::Other, Chain, Value.getOperand(0),
Ptr, SrcValue);
return SDOperand();
}