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Fix a dagcombine optimization. The optimization attempts to optimize a bitcast of fneg to integers

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by xoring the high-bit. This fails if the source operand is a vector because we need to negate
each of the elements in the vector.

Fix rdar://12281066 PR13813.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-09-13 14:54:28 +00:00
parent faf31d01db
commit 91a7e0184a
2 changed files with 23 additions and 1 deletions
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3
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -5441,7 +5441,8 @@ SDValue DAGCombiner::visitBITCAST(SDNode *N) {
// This often reduces constant pool loads.
if (((N0.getOpcode() == ISD::FNEG && !TLI.isFNegFree(VT)) ||
(N0.getOpcode() == ISD::FABS && !TLI.isFAbsFree(VT))) &&
N0.getNode()->hasOneUse() && VT.isInteger() && !VT.isVector()) {
N0.getNode()->hasOneUse() && VT.isInteger() &&
!VT.isVector() && !N0.getValueType().isVector()) {
SDValue NewConv = DAG.getNode(ISD::BITCAST, N0.getDebugLoc(), VT,
N0.getOperand(0));
AddToWorkList(NewConv.getNode());