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Fix a corner case in updating LoopInfo after fully unrolling an outer loop.

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The loop tree's inclusive block lists are painful and expensive to
update. (I have no idea why they're inclusive). The design was
supposed to handle this case but the implementation missed it and my
unit tests weren't thorough enough.

Fixes PR11335: loop unroll update.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144970 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-11-18 03:42:41 +00:00
parent cbbe33fde4
commit 5865a8dfde
2 changed files with 50 additions and 11 deletions
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41
test/Transforms/LoopUnroll/unloop.ll
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@@ -427,3 +427,44 @@ if.end2413: ; preds = %defchar
return: ; preds = %sw.bb304
ret void
}
; PR11335: the most deeply nested block should be removed from the outer loop.
; CHECK: @removeSubloopBlocks2
; CHECK: for.cond3:
; CHECK-NOT: br
; CHECK: ret void
define void @removeSubloopBlocks2() nounwind {
entry:
%tobool.i = icmp ne i32 undef, 0
br label %lbl_616
lbl_616.loopexit: ; preds = %for.cond
br label %lbl_616
lbl_616: ; preds = %lbl_616.loopexit, %entry
br label %for.cond
for.cond: ; preds = %for.cond3, %lbl_616
br i1 false, label %for.cond1.preheader, label %lbl_616.loopexit
for.cond1.preheader: ; preds = %for.cond
br label %for.cond1
for.cond1.loopexit: ; preds = %for.cond.i
br label %for.cond1
for.cond1: ; preds = %for.cond1.loopexit, %for.cond1.preheader
br i1 false, label %for.body2, label %for.cond3
for.body2: ; preds = %for.cond1
br label %for.cond.i
for.cond.i: ; preds = %for.cond.i, %for.body2
br i1 %tobool.i, label %for.cond.i, label %for.cond1.loopexit
for.cond3: ; preds = %for.cond1
br i1 false, label %for.cond, label %if.end
if.end: ; preds = %for.cond3
ret void
}