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don't fold fp_round(fp_extend(load)) -> fp_round(extload)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45400 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-12-29 06:55:23 +00:00
parent 112dedc520
commit 5938bef2d2
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3672,6 +3672,10 @@ SDOperand DAGCombiner::visitFP_EXTEND(SDNode *N) {
ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
MVT::ValueType VT = N->getValueType(0);
// If this is fp_round(fpextend), don't fold it, allow ourselves to be folded.
if (N->hasOneUse() && (*N->use_begin())->getOpcode() == ISD::FP_ROUND)
return SDOperand();
// fold (fp_extend c1fp) -> c1fp
if (N0CFP && VT != MVT::ppcf128)
return DAG.getNode(ISD::FP_EXTEND, VT, N0);