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| author | Dan Gohman <gohman@apple.com> | 2010-09-04 02:42:48 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-09-04 02:42:48 +0000 |
| commit | ffa75cdcf82ef2034249a313b9276eaa1bee6c43 (patch) | |
| tree | c6c62ef6b26365a814b84fb17df1df50a07ed855 /test/Transforms/LoopSimplify | |
| parent | aace0f295b0e2467a38424aa7ead34de09b3f37d (diff) | |
| download | external_llvm-ffa75cdcf82ef2034249a313b9276eaa1bee6c43.zip external_llvm-ffa75cdcf82ef2034249a313b9276eaa1bee6c43.tar.gz external_llvm-ffa75cdcf82ef2034249a313b9276eaa1bee6c43.tar.bz2 | |
Fix LoopSimplify to notify ScalarEvolution when splitting a loop backedge
into an inner loop, as the new loop iteration may differ substantially.
This fixes PR8078.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113057 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/LoopSimplify')
| -rw-r--r-- | test/Transforms/LoopSimplify/preserve-scev.ll | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/test/Transforms/LoopSimplify/preserve-scev.ll b/test/Transforms/LoopSimplify/preserve-scev.ll new file mode 100644 index 0000000..017a0d2 --- /dev/null +++ b/test/Transforms/LoopSimplify/preserve-scev.ll @@ -0,0 +1,50 @@ +; RUN: opt -S < %s -indvars | opt -analyze -iv-users | grep {%cmp = icmp slt i32} | grep {= \{%\\.ph,+,1\}<%for.cond>} +; PR8079 + +; LoopSimplify should invalidate indvars when splitting out the +; inner loop. + +@maxStat = external global i32 + +define i32 @test() nounwind { +entry: + br label %for.cond + +for.cond: ; preds = %if.then5, %if.end, %entry + %cuts.1 = phi i32 [ 0, %entry ], [ %inc, %if.then5 ], [ %cuts.1, %if.end ] + %0 = phi i32 [ 0, %entry ], [ %add, %if.end ], [ %add, %if.then5 ] + %add = add i32 %0, 1 + %cmp = icmp slt i32 %0, 1 + %tmp1 = load i32* @maxStat, align 4 + br i1 %cmp, label %for.body, label %for.cond14.preheader + +for.cond14.preheader: ; preds = %for.cond + %cmp1726 = icmp sgt i32 %tmp1, 0 + br i1 %cmp1726, label %for.body18, label %return + +for.body: ; preds = %for.cond + %cmp2 = icmp sgt i32 %tmp1, 100 + br i1 %cmp2, label %return, label %if.end + +if.end: ; preds = %for.body + %cmp4 = icmp sgt i32 %tmp1, -1 + br i1 %cmp4, label %if.then5, label %for.cond + +if.then5: ; preds = %if.end + call void @foo() nounwind + %inc = add i32 %cuts.1, 1 + br label %for.cond + +for.body18: ; preds = %for.body18, %for.cond14.preheader + %i13.027 = phi i32 [ %1, %for.body18 ], [ 0, %for.cond14.preheader ] + call void @foo() nounwind + %1 = add nsw i32 %i13.027, 1 + %tmp16 = load i32* @maxStat, align 4 + %cmp17 = icmp slt i32 %1, %tmp16 + br i1 %cmp17, label %for.body18, label %return + +return: ; preds = %for.body18, %for.body, %for.cond14.preheader + ret i32 0 +} + +declare void @foo() nounwind |