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Add a testcase to help test analysis preservation.

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llvm-svn: 83002
This commit is contained in:
Dan Gohman 2009-09-28 18:40:27 +00:00
parent bfa2d75c49
commit a1812df16b
1 changed files with 47 additions and 0 deletions
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47
test/Transforms/LoopRotate/preserve-scev.ll Normal file
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; RUN: opt < %s -loop-rotate -loop-reduce -disable-output
define fastcc void @foo() nounwind {
BB:
br label %BB1
BB1: ; preds = %BB19, %BB
br label %BB4
BB2: ; preds = %BB4
%tmp = bitcast i32 undef to i32 ; <i32> [#uses=1]
br label %BB4
BB4: ; preds = %BB3, %BB1
%tmp5 = phi i32 [ undef, %BB1 ], [ %tmp, %BB2 ] ; <i32> [#uses=1]
br i1 false, label %BB8, label %BB2
BB8: ; preds = %BB6
%tmp7 = bitcast i32 %tmp5 to i32 ; <i32> [#uses=2]
br i1 false, label %BB9, label %BB13
BB9: ; preds = %BB12, %BB8
%tmp10 = phi i32 [ %tmp11, %BB12 ], [ %tmp7, %BB8 ] ; <i32> [#uses=2]
%tmp11 = add i32 %tmp10, 1 ; <i32> [#uses=1]
br label %BB12
BB12: ; preds = %BB9
br i1 false, label %BB9, label %BB17
BB13: ; preds = %BB15, %BB8
%tmp14 = phi i32 [ %tmp16, %BB15 ], [ %tmp7, %BB8 ] ; <i32> [#uses=1]
br label %BB15
BB15: ; preds = %BB13
%tmp16 = add i32 %tmp14, -1 ; <i32> [#uses=1]
br i1 false, label %BB13, label %BB18
BB17: ; preds = %BB12
br label %BB19
BB18: ; preds = %BB15
br label %BB19
BB19: ; preds = %BB18, %BB17
%tmp20 = phi i32 [ %tmp10, %BB17 ], [ undef, %BB18 ] ; <i32> [#uses=0]
br label %BB1
}