diff options
| author | Bob Wilson <bob.wilson@apple.com> | 2009-05-12 03:48:10 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2009-05-12 03:48:10 +0000 |
| commit | 74b0ccc577062a25b8b3ab99b13cd1efa6e3a75a (patch) | |
| tree | 78855a096980b66537b0627ef124f1941aae0033 /test/CodeGen/ARM/2009-05-11-CodePlacementCrash.ll | |
| parent | 81db61a2e6d3c95a2738c3559a108e05e9d7a05a (diff) | |
| download | llvm-74b0ccc577062a25b8b3ab99b13cd1efa6e3a75a.tar.gz llvm-74b0ccc577062a25b8b3ab99b13cd1efa6e3a75a.tar.bz2 llvm-74b0ccc577062a25b8b3ab99b13cd1efa6e3a75a.tar.xz | |
Fix pr4195: When iterating through predecessor blocks, break out of the loop
after finding the (unique) layout predecessor. Sometimes a block may be listed
more than once, and processing it more than once in this loop can lead to
inconsistent values for FtTBB/FtFBB, since the AnalyzeBranch method does not
clear these values. There's no point in continuing the loop regardless.
The testcase for this is reduced from the 2003-05-02-DependentPHI SingleSource
test.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71536 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/ARM/2009-05-11-CodePlacementCrash.ll')
| -rw-r--r-- | test/CodeGen/ARM/2009-05-11-CodePlacementCrash.ll | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/2009-05-11-CodePlacementCrash.ll b/test/CodeGen/ARM/2009-05-11-CodePlacementCrash.ll new file mode 100644 index 0000000000..35d4306e9d --- /dev/null +++ b/test/CodeGen/ARM/2009-05-11-CodePlacementCrash.ll @@ -0,0 +1,30 @@ +; RUN: llvm-as < %s | llc -march=arm + %struct.List = type { %struct.List*, i32 } +@Node5 = external constant %struct.List ; <%struct.List*> [#uses=1] +@"\01LC" = external constant [7 x i8] ; <[7 x i8]*> [#uses=1] + +define i32 @main() nounwind { +entry: + br label %bb + +bb: ; preds = %bb3, %entry + %CurL.02 = phi %struct.List* [ @Node5, %entry ], [ %2, %bb3 ] ; <%struct.List*> [#uses=1] + %PrevL.01 = phi %struct.List* [ null, %entry ], [ %CurL.02, %bb3 ] ; <%struct.List*> [#uses=1] + %0 = icmp eq %struct.List* %PrevL.01, null ; <i1> [#uses=1] + br i1 %0, label %bb3, label %bb1 + +bb1: ; preds = %bb + br label %bb3 + +bb3: ; preds = %bb1, %bb + %iftmp.0.0 = phi i32 [ 0, %bb1 ], [ -1, %bb ] ; <i32> [#uses=1] + %1 = tail call i32 (i8*, ...)* @printf(i8* getelementptr ([7 x i8]* @"\01LC", i32 0, i32 0), i32 0, i32 %iftmp.0.0) nounwind ; <i32> [#uses=0] + %2 = load %struct.List** null, align 4 ; <%struct.List*> [#uses=2] + %phitmp = icmp eq %struct.List* %2, null ; <i1> [#uses=1] + br i1 %phitmp, label %bb5, label %bb + +bb5: ; preds = %bb3 + ret i32 0 +} + +declare i32 @printf(i8* nocapture, ...) nounwind |