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Diffstat (limited to 'test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll')
| -rw-r--r-- | test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll b/test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll new file mode 100644 index 0000000000..31dba79be1 --- /dev/null +++ b/test/Transforms/LoopUnswitch/2008-11-03-Invariant.ll @@ -0,0 +1,37 @@ +; REQUIRES: asserts +; RUN: opt < %s -loop-unswitch -stats -disable-output 2>&1 | grep "1 loop-unswitch - Number of branches unswitched" | count 1 +; PR 3170 +define i32 @a(i32 %x, i32 %y) nounwind { +entry: + %0 = icmp ult i32 0, %y ; <i1> [#uses=1] + br i1 %0, label %bb.nph, label %bb4 + +bb.nph: ; preds = %entry + %1 = icmp eq i32 %x, 0 ; <i1> [#uses=1] + br label %bb + +bb: ; preds = %bb.nph, %bb3 + %i.01 = phi i32 [ %3, %bb3 ], [ 0, %bb.nph ] ; <i32> [#uses=1] + br i1 %1, label %bb2, label %bb1 + +bb1: ; preds = %bb + %2 = tail call i32 (...)* @b() nounwind ; <i32> [#uses=0] + br label %bb2 + +bb2: ; preds = %bb, %bb1 + %3 = add i32 %i.01, 1 ; <i32> [#uses=2] + br label %bb3 + +bb3: ; preds = %bb2 + %i.0 = phi i32 [ %3, %bb2 ] ; <i32> [#uses=1] + %4 = icmp ult i32 %i.0, %y ; <i1> [#uses=1] + br i1 %4, label %bb, label %bb3.bb4_crit_edge + +bb3.bb4_crit_edge: ; preds = %bb3 + br label %bb4 + +bb4: ; preds = %bb3.bb4_crit_edge, %entry + ret i32 0 +} + +declare i32 @b(...) |