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Diffstat (limited to 'test/Transforms/LICM/2003-02-27-PreheaderProblem.ll')
| -rw-r--r-- | test/Transforms/LICM/2003-02-27-PreheaderProblem.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/Transforms/LICM/2003-02-27-PreheaderProblem.ll b/test/Transforms/LICM/2003-02-27-PreheaderProblem.ll new file mode 100644 index 000000000000..18b86064ed04 --- /dev/null +++ b/test/Transforms/LICM/2003-02-27-PreheaderProblem.ll @@ -0,0 +1,24 @@ +; Here we have a case where there are two loops and LICM is hoisting an +; instruction from one loop into the other loop! This is obviously bad and +; happens because preheader insertion doesn't insert a preheader for this +; case... bad. + +; RUN: llvm-as < %s | opt -licm -loop-deletion -simplifycfg | llvm-dis | \ +; RUN: not grep {br } + +define i32 @main(i32 %argc) { +; <label>:0 + br label %bb5 +bb5: ; preds = %bb5, %0 + %I = phi i32 [ 0, %0 ], [ %I2, %bb5 ] ; <i32> [#uses=1] + %I2 = add i32 %I, 1 ; <i32> [#uses=2] + %c = icmp eq i32 %I2, 10 ; <i1> [#uses=1] + br i1 %c, label %bb5, label %bb8 +bb8: ; preds = %bb8, %bb5 + %cann-indvar = phi i32 [ 0, %bb8 ], [ 0, %bb5 ] ; <i32> [#uses=0] + %X = add i32 %argc, %argc ; <i32> [#uses=1] + br i1 false, label %bb8, label %bb10 +bb10: ; preds = %bb8 + ret i32 %X +} + |