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When determining a canonical insert position, don't climb deeper

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into adjacent loops. Also, ensure that the insert position is
dominated by the loop latch of any loop in the post-inc set which
has a latch.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100906 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-04-09 22:07:05 +00:00
parent 347fa3fa26
commit e5f76877ae
2 changed files with 103 additions and 33 deletions
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30
test/Transforms/LoopStrengthReduce/uglygep.ll
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@@ -35,3 +35,33 @@ bb14: ; preds = %bb14, %bb10
store i8 undef, i8* %t9
br label %bb14
}
define fastcc void @TransformLine() nounwind {
bb:
br label %loop0
loop0: ; preds = %loop0, %bb
%i0 = phi i32 [ %i0.next, %loop0 ], [ 0, %bb ] ; <i32> [#uses=2]
%i0.next = add i32 %i0, 1 ; <i32> [#uses=1]
br i1 false, label %loop0, label %bb0
bb0: ; preds = %loop0
br label %loop1
loop1: ; preds = %bb5, %bb0
%i1 = phi i32 [ 0, %bb0 ], [ %i1.next, %bb5 ] ; <i32> [#uses=4]
%t0 = add i32 %i0, %i1 ; <i32> [#uses=1]
br i1 false, label %bb2, label %bb6
bb2: ; preds = %loop1
br i1 true, label %bb6, label %bb5
bb5: ; preds = %bb2
%i1.next = add i32 %i1, 1 ; <i32> [#uses=1]
br i1 true, label %bb6, label %loop1
bb6: ; preds = %bb5, %bb2, %loop1
%p8 = phi i32 [ %t0, %bb5 ], [ undef, %loop1 ], [ undef, %bb2 ] ; <i32> [#uses=0]
%p9 = phi i32 [ undef, %bb5 ], [ %i1, %loop1 ], [ %i1, %bb2 ] ; <i32> [#uses=0]
unreachable
}