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LoopVectorizer: Fix an endless loop in the code that looks for reductions.

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The bug was in the code that detects PHIs in if-then-else block sequence.

PR14701.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171008 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-12-24 01:22:06 +00:00
parent a048c237e6
commit 470ea9b72f
2 changed files with 52 additions and 7 deletions
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test/Transforms/LoopVectorize/2012-10-20-infloop.ll
+44
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@@ -25,3 +25,47 @@ for.body: ; preds = %for.body, %entry
for.end: ; preds = %for.body
unreachable
}
;PR14701
define void @start_model_rare() nounwind uwtable ssp {
entry:
br i1 undef, label %return, label %if.end
if.end: ; preds = %entry
br i1 undef, label %cond.false, label %cond.true
cond.true: ; preds = %if.end
unreachable
cond.false: ; preds = %if.end
br i1 undef, label %cond.false28, label %cond.true20
cond.true20: ; preds = %cond.false
unreachable
cond.false28: ; preds = %cond.false
br label %for.body40
for.body40: ; preds = %for.inc50, %cond.false28
%indvars.iv123 = phi i64 [ 3, %cond.false28 ], [ %indvars.iv.next124, %for.inc50 ]
%step.0121 = phi i32 [ 1, %cond.false28 ], [ %step.1, %for.inc50 ]
br i1 undef, label %if.then46, label %for.inc50
if.then46: ; preds = %for.body40
%inc47 = add nsw i32 %step.0121, 1
br label %for.inc50
for.inc50: ; preds = %if.then46, %for.body40
%k.1 = phi i32 [ undef, %for.body40 ], [ %inc47, %if.then46 ]
%step.1 = phi i32 [ %step.0121, %for.body40 ], [ %inc47, %if.then46 ]
%indvars.iv.next124 = add i64 %indvars.iv123, 1
%lftr.wideiv = trunc i64 %indvars.iv.next124 to i32
%exitcond = icmp eq i32 %lftr.wideiv, 256
br i1 %exitcond, label %for.end52, label %for.body40
for.end52: ; preds = %for.inc50
unreachable
return: ; preds = %entry
ret void
}