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author | Evan Cheng <evan.cheng@apple.com> | 2008-08-06 18:04:43 +0000 |
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committer | Evan Cheng <evan.cheng@apple.com> | 2008-08-06 18:04:43 +0000 |
commit | f5e25f32c7605569390f5e81ebb582c96d74a1d2 (patch) | |
tree | da00954f0f92c3e584df514c8d9d33f86fded86c /test | |
parent | 165660e417db0f42f9afb1a37f50310a166e5a93 (diff) | |
download | llvm-f5e25f32c7605569390f5e81ebb582c96d74a1d2.tar.gz llvm-f5e25f32c7605569390f5e81ebb582c96d74a1d2.tar.bz2 llvm-f5e25f32c7605569390f5e81ebb582c96d74a1d2.tar.xz |
Fix PR2355: bug in ChangeCompareStride. When the loop termination compare is the only use of its iv stride, the stride can be eliminated by moving it to another stride. If the scale is negative, swap the predicate instead of using a inverse predicate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54415 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/Transforms/LoopStrengthReduce/2008-08-06-CmpStride.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/Transforms/LoopStrengthReduce/2008-08-06-CmpStride.ll b/test/Transforms/LoopStrengthReduce/2008-08-06-CmpStride.ll new file mode 100644 index 0000000000..3700c69812 --- /dev/null +++ b/test/Transforms/LoopStrengthReduce/2008-08-06-CmpStride.ll @@ -0,0 +1,24 @@ +; RUN: llvm-as < %s | opt -loop-reduce | llvm-dis | grep ugt +; PR2355 + +@.str = internal constant [4 x i8] c"%d\0A\00" + +declare i32 @printf(i8* noalias , ...) nounwind + +define i32 @main() nounwind { +entry: + br label %forbody + +forbody: + %i.0 = phi i32 [ 0, %entry ], [ %inc, %forbody ] ; <i32>[#uses=3] + %sub14 = sub i32 1027, %i.0 ; <i32> [#uses=1] + %mul15 = mul i32 %sub14, 10 ; <i32> [#uses=1] + %add166 = or i32 %mul15, 1 ; <i32> [#uses=1] * + call i32 (i8*, ...)* @printf( i8* noalias getelementptr ([4 x i8]* @.str, i32 0, i32 0), i32 %add166 ) nounwind + %inc = add i32 %i.0, 1 ; <i32> [#uses=3] + %cmp = icmp ult i32 %inc, 1027 ; <i1> [#uses=1] + br i1 %cmp, label %forbody, label %afterfor + +afterfor: ; preds = %forcond + ret i32 0 +} |