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| author | Evan Cheng <evan.cheng@apple.com> | 2008-03-10 19:58:22 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-03-10 19:58:22 +0000 |
| commit | cf31b8d763edf30c4d8cb9080de2c81a3764ef09 (patch) | |
| tree | 55a9f4f7c0219a2a9fc535642ff4360960e03580 /lib/CodeGen | |
| parent | 8d51ab3e4bb3f45ab8818519c5d27154cecf8b72 (diff) | |
| download | external_llvm-cf31b8d763edf30c4d8cb9080de2c81a3764ef09.zip external_llvm-cf31b8d763edf30c4d8cb9080de2c81a3764ef09.tar.gz external_llvm-cf31b8d763edf30c4d8cb9080de2c81a3764ef09.tar.bz2 | |
Somewhat better solution.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48170 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 5cda144..4592971 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1103,9 +1103,10 @@ SDOperand DAGCombiner::visitSUB(SDNode *N) { // fold (sub x, x) -> 0 if (N0 == N1) { - if (ISD::isBuildVectorAllZeros(N0.Val)) - // Zero vectors might be normalized to a particular vector type to ensure - // they are CSE'd. Return it as it is. + if (!AfterLegalize || !MVT::isVector(VT)) + // For example, zero vectors might be normalized to a particular vector + // type to ensure they are CSE'd. Avoid issuing zero vector nodes of + // *unexpected* type after legalization. return N0; return DAG.getConstant(0, N->getValueType(0)); } |