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Diffstat (limited to 'test/Transforms/SCCP/sccptest.ll')
| -rw-r--r-- | test/Transforms/SCCP/sccptest.ll | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/test/Transforms/SCCP/sccptest.ll b/test/Transforms/SCCP/sccptest.ll new file mode 100644 index 000000000000..84ba2d43cde7 --- /dev/null +++ b/test/Transforms/SCCP/sccptest.ll @@ -0,0 +1,31 @@ +; This is the test case taken from appel's book that illustrates a hard case +; that SCCP gets right. BB3 should be completely eliminated. +; +; RUN: llvm-as < %s | opt -sccp -constprop -dce -simplifycfg | \ +; RUN: llvm-dis | not grep BB3 + +define i32 @testfunction(i32 %i0, i32 %j0) { +BB1: + br label %BB2 +BB2: ; preds = %BB7, %BB1 + %j2 = phi i32 [ %j4, %BB7 ], [ 1, %BB1 ] ; <i32> [#uses=2] + %k2 = phi i32 [ %k4, %BB7 ], [ 0, %BB1 ] ; <i32> [#uses=4] + %kcond = icmp slt i32 %k2, 100 ; <i1> [#uses=1] + br i1 %kcond, label %BB3, label %BB4 +BB3: ; preds = %BB2 + %jcond = icmp slt i32 %j2, 20 ; <i1> [#uses=1] + br i1 %jcond, label %BB5, label %BB6 +BB4: ; preds = %BB2 + ret i32 %j2 +BB5: ; preds = %BB3 + %k3 = add i32 %k2, 1 ; <i32> [#uses=1] + br label %BB7 +BB6: ; preds = %BB3 + %k5 = add i32 %k2, 1 ; <i32> [#uses=1] + br label %BB7 +BB7: ; preds = %BB6, %BB5 + %j4 = phi i32 [ 1, %BB5 ], [ %k2, %BB6 ] ; <i32> [#uses=1] + %k4 = phi i32 [ %k3, %BB5 ], [ %k5, %BB6 ] ; <i32> [#uses=1] + br label %BB2 +} + |