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Simplify store(bitconv(x)) to store(x). This allows us to compile this:
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24983 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2081,6 +2081,11 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
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return SDOperand(N, 0);
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}
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// If this is a store of a bit convert, store the input value.
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if (Value.getOpcode() == ISD::BIT_CONVERT)
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return DAG.getNode(ISD::STORE, MVT::Other, Chain, Value.getOperand(0),
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Ptr, SrcValue);
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return SDOperand();
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}
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