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Fix an infinite loop in the loop-vectorizer.

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PR14134.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166379 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-10-20 20:45:01 +00:00
parent b8f2d82403
commit ccaccfa8bf
2 changed files with 18 additions and 0 deletions
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6
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -1175,6 +1175,12 @@ bool LoopVectorizationLegality::AddReductionVar(PHINode *Phi,
bool FoundInBlockUser = false;
// Did we reach the initial PHI node ?
bool FoundStartPHI = false;
// If the instruction has no users then this is a broken
// chain and can't be a reduction variable.
if (Iter->use_begin() == Iter->use_end())
return false;
// For each of the *users* of iter.
for (Value::use_iterator it = Iter->use_begin(), e = Iter->use_end();
it != e; ++it) {

12
test/Transforms/LoopVectorize/2012-10-20-infloop.ll Normal file
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@ -0,0 +1,12 @@
; RUN: opt < %s -loop-vectorize -dce
; Check that we don't fall into an infinite loop.
define void @test() nounwind {
entry:
br label %for.body
for.body:
%0 = phi i32 [ 1, %entry ], [ 0, %for.body ]
br label %for.body
}