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Fix #9190

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The bug happens when the DAGCombiner attempts to optimize one of the patterns
of the SUB opcode. It tries to create a zero of type v2i64. This type is legal
on 32bit machines, but the initializer of this vector (i64) is target dependent.
Currently, the initializer attempts to create an i64 zero constant, which fails.
Added a flag to tell the DAGCombiner to create a legal zero, if we require that
the pass would generate legal types.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125391 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2011-02-11 19:20:37 +00:00
parent 015b4b5a05
commit 5a4552ca42
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1533,7 +1533,7 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
// fold (sub x, x) -> 0
if (N0 == N1)
return DAG.getConstant(0, N->getValueType(0));
return DAG.getConstant(0, N->getValueType(0), LegalTypes);
// fold (sub c1, c2) -> c1-c2
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SUB, VT, N0C, N1C);