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| author | Manman Ren <mren@apple.com> | 2012-09-14 21:53:06 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-09-14 21:53:06 +0000 |
| commit | ad2890760f9661fb6a3dfa3ca863a87f6aea4139 (patch) | |
| tree | d8eb4fbb010f17dd044ab643854c954a9aedbd9d /test/Transforms/SimplifyCFG | |
| parent | 911908dcb820848056a8c23fe762af37ab857779 (diff) | |
| download | llvm-ad2890760f9661fb6a3dfa3ca863a87f6aea4139.tar.gz llvm-ad2890760f9661fb6a3dfa3ca863a87f6aea4139.tar.bz2 llvm-ad2890760f9661fb6a3dfa3ca863a87f6aea4139.tar.xz | |
PGO: preserve branch-weight metadata when simplifying a switch with a single
case to a conditional branch and when removing dead cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163942 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/SimplifyCFG')
| -rw-r--r-- | test/Transforms/SimplifyCFG/preserve-branchweights.ll | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/test/Transforms/SimplifyCFG/preserve-branchweights.ll b/test/Transforms/SimplifyCFG/preserve-branchweights.ll index 71b27809ff..93bbcfb38c 100644 --- a/test/Transforms/SimplifyCFG/preserve-branchweights.ll +++ b/test/Transforms/SimplifyCFG/preserve-branchweights.ll @@ -109,12 +109,60 @@ sw.epilog: ret void } +;; test6 - Some cases of the second switch are pruned during optimization. +;; Then the second switch will be converted to a branch, finally, the first +;; switch and the branch will be merged into a single switch. +define void @test6(i32 %M, i32 %N) nounwind uwtable { +entry: + switch i32 %N, label %sw2 [ + i32 1, label %sw2 + i32 2, label %sw.bb + i32 3, label %sw.bb1 + ], !prof !4 +; CHECK: test6 +; CHECK: switch i32 %N, label %sw.epilog +; CHECK: i32 3, label %sw.bb1 +; CHECK: i32 2, label %sw.bb +; CHECK: i32 4, label %sw.bb5 +; CHECK: ], !prof !3 + +sw.bb: + call void @helper(i32 0) + br label %sw.epilog + +sw.bb1: + call void @helper(i32 1) + br label %sw.epilog + +sw2: +;; Here "case 2" is invalidated since the default case of the first switch +;; does not include "case 2". + switch i32 %N, label %sw.epilog [ + i32 2, label %sw.bb4 + i32 4, label %sw.bb5 + ], !prof !5 + +sw.bb4: + call void @helper(i32 2) + br label %sw.epilog + +sw.bb5: + call void @helper(i32 3) + br label %sw.epilog + +sw.epilog: + ret void +} + !0 = metadata !{metadata !"branch_weights", i32 3, i32 5} !1 = metadata !{metadata !"branch_weights", i32 1, i32 1} !2 = metadata !{metadata !"branch_weights", i32 1, i32 2} !3 = metadata !{metadata !"branch_weights", i32 4, i32 3, i32 2, i32 1} +!4 = metadata !{metadata !"branch_weights", i32 4, i32 3, i32 2, i32 1} +!5 = metadata !{metadata !"branch_weights", i32 7, i32 6, i32 5} ; CHECK: !0 = metadata !{metadata !"branch_weights", i32 5, i32 11} ; CHECK: !1 = metadata !{metadata !"branch_weights", i32 1, i32 5} ; CHECK: !2 = metadata !{metadata !"branch_weights", i32 7, i32 1, i32 2} -; CHECK-NOT: !3 +; CHECK: !3 = metadata !{metadata !"branch_weights", i32 49, i32 12, i32 24, i32 35} +; CHECK-NOT: !4 |