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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2013-07-06 14:05:09 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2013-07-06 14:05:09 +0000 |
| commit | f4eeab452ad4093986359c78a57321df12df99b0 (patch) | |
| tree | 18e20c9044ed731be0e644bf0d52fe54f4155ad1 /lib/CodeGen/SelectionDAG | |
| parent | e5a81a130f26b0b2651ad6a22e3748703b11cb46 (diff) | |
| download | external_llvm-f4eeab452ad4093986359c78a57321df12df99b0.zip external_llvm-f4eeab452ad4093986359c78a57321df12df99b0.tar.gz external_llvm-f4eeab452ad4093986359c78a57321df12df99b0.tar.bz2 | |
DAGCombiner: Don't drop extension behavior when shrinking a load when unsafe.
ReduceLoadWidth unconditionally drops extensions from loads. Limit it to the
case when all of the bits the extension would otherwise produce are dropped by
the shrink. It would be possible to shrink the load in more cases by merging
the extensions, but this isn't trivial and a very rare case. I left a TODO for
that case.
Fixes PR16551.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185755 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 1688fc4..276a5b9 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -5220,6 +5220,13 @@ SDValue DAGCombiner::ReduceLoadWidth(SDNode *N) { if (LN0->getNumValues() > 2) return SDValue(); + // If the load that we're shrinking is an extload and we're not just + // discarding the extension we can't simply shrink the load. Bail. + // TODO: It would be possible to merge the extensions in some cases. + if (LN0->getExtensionType() != ISD::NON_EXTLOAD && + LN0->getMemoryVT().getSizeInBits() < ExtVT.getSizeInBits() + ShAmt) + return SDValue(); + EVT PtrType = N0.getOperand(1).getValueType(); if (PtrType == MVT::Untyped || PtrType.isExtended()) |