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author | Shih-wei Liao <sliao@google.com> | 2010-02-10 11:10:31 -0800 |
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committer | Shih-wei Liao <sliao@google.com> | 2010-02-10 11:10:31 -0800 |
commit | e264f62ca09a8f65c87a46d562a4d0f9ec5d457e (patch) | |
tree | 59e3d57ef656cef79afa708ae0a3daf25cd91fcf /test/Transforms/LoopDeletion/dcetest.ll | |
download | external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.zip external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.tar.gz external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.tar.bz2 |
Check in LLVM r95781.
Diffstat (limited to 'test/Transforms/LoopDeletion/dcetest.ll')
-rw-r--r-- | test/Transforms/LoopDeletion/dcetest.ll | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/test/Transforms/LoopDeletion/dcetest.ll b/test/Transforms/LoopDeletion/dcetest.ll new file mode 100644 index 0000000..f1e793d --- /dev/null +++ b/test/Transforms/LoopDeletion/dcetest.ll @@ -0,0 +1,36 @@ +; This is the test case taken from Appel's book that illustrates a hard case +; that SCCP gets right, and when followed by ADCE, is completely eliminated +; +; RUN: opt < %s -sccp -simplifycfg -indvars -loop-deletion -dce -simplifycfg -S | not grep br + +define i32 @"test function"(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 +} + |