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| author | Evan Cheng <evan.cheng@apple.com> | 2008-06-11 19:07:54 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-06-11 19:07:54 +0000 |
| commit | bb318c073e0442ad86aa499ed329058ebce9b4c7 (patch) | |
| tree | 8aab99d7f53edf7cd2b712dbddd160f73c1c84f2 /test | |
| parent | 4468440a2a92fecd57f002b1b9c0683d2b9c4aea (diff) | |
| download | llvm-bb318c073e0442ad86aa499ed329058ebce9b4c7.tar.gz llvm-bb318c073e0442ad86aa499ed329058ebce9b4c7.tar.bz2 llvm-bb318c073e0442ad86aa499ed329058ebce9b4c7.tar.xz | |
Avoid duplicating loop header which leads to unnatural loops (and just seem like general badness to me, likely to cause code explosion).
Patch by Florian Brandner.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52223 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/TailDup/2008-06-11-AvoidDupLoopHeader.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/Transforms/TailDup/2008-06-11-AvoidDupLoopHeader.ll b/test/Transforms/TailDup/2008-06-11-AvoidDupLoopHeader.ll new file mode 100644 index 0000000000..5692ca6726 --- /dev/null +++ b/test/Transforms/TailDup/2008-06-11-AvoidDupLoopHeader.ll @@ -0,0 +1,27 @@ +; RUN: llvm-as < %s | opt -tailduplicate -taildup-threshold=3 -stats -disable-output |& +; RUN: not grep tailduplicate + +define i32 @foo(i32 %l) nounwind { +entry: + %cond = icmp eq i32 %l, 1 ; <i1> [#uses=1] + br i1 %cond, label %bb, label %bb9 + +bb: ; preds = %entry + br label %bb9 + +bb5: ; preds = %bb9 + %tmp7 = call i32 (...)* @bar( i32 %x.0 ) nounwind ; <i32> [#uses=1] + br label %bb9 + +bb9: ; preds = %bb5, %bb, %entry + %x.0 = phi i32 [ 0, %entry ], [ %tmp7, %bb5 ], [ 1525, %bb ] ; <i32> [#uses=2] + %l_addr.0 = phi i32 [ %l, %entry ], [ %tmp11, %bb5 ], [ %l, %bb ] ; <i32> [#uses=1] + %tmp11 = add i32 %l_addr.0, -1 ; <i32> [#uses=2] + %tmp13 = icmp eq i32 %tmp11, -1 ; <i1> [#uses=1] + br i1 %tmp13, label %bb15, label %bb5 + +bb15: ; preds = %bb9 + ret i32 %x.0 +} + +declare i32 @bar(...) |