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When discarding SrcValue information, discard all of it so that code

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that uses this information knows to behave conservatively.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85654 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-10-31 14:14:04 +00:00
parent 60d686df54
commit 75832d7d4f
1 changed files with 5 additions and 7 deletions
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12
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -5730,9 +5730,9 @@ bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDValue LHS,
// If this is an EXTLOAD, the VT's must match.
if (LLD->getMemoryVT() == RLD->getMemoryVT()) {
// FIXME: this conflates two src values, discarding one. This is not
// the right thing to do, but nothing uses srcvalues now. When they do,
// turn SrcValue into a list of locations.
// FIXME: this discards src value information. This is
// over-conservative. It would be beneficial to be able to remember
// both potential memory locations.
SDValue Addr;
if (TheSelect->getOpcode() == ISD::SELECT) {
// Check that the condition doesn't reach either load. If so, folding
@ -5770,16 +5770,14 @@ bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDValue LHS,
Load = DAG.getLoad(TheSelect->getValueType(0),
TheSelect->getDebugLoc(),
LLD->getChain(),
Addr,LLD->getSrcValue(),
LLD->getSrcValueOffset(),
Addr, 0, 0,
LLD->isVolatile(),
LLD->getAlignment());
} else {
Load = DAG.getExtLoad(LLD->getExtensionType(),
TheSelect->getDebugLoc(),
TheSelect->getValueType(0),
LLD->getChain(), Addr, LLD->getSrcValue(),
LLD->getSrcValueOffset(),
LLD->getChain(), Addr, 0, 0,
LLD->getMemoryVT(),
LLD->isVolatile(),
LLD->getAlignment());