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| author | Manman Ren <mren@apple.com> | 2012-09-18 00:47:33 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-09-18 00:47:33 +0000 |
| commit | 222d6192adeba434d64893de920bd72c36f7e8c8 (patch) | |
| tree | 118f201e50fbdeb0a92a7c7b591b04a97c74bb4d /test/Transforms/SimplifyCFG/preserve-branchweights.ll | |
| parent | e4095f95ac2480aabbe289f41723b53ac1c82a98 (diff) | |
| download | external_llvm-222d6192adeba434d64893de920bd72c36f7e8c8.zip external_llvm-222d6192adeba434d64893de920bd72c36f7e8c8.tar.gz external_llvm-222d6192adeba434d64893de920bd72c36f7e8c8.tar.bz2 | |
PGO: preserve branch-weight metadata when simplifying Switch to a sub, an icmp
and a conditional branch; also when removing dead cases from a switch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164084 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/SimplifyCFG/preserve-branchweights.ll')
| -rw-r--r-- | test/Transforms/SimplifyCFG/preserve-branchweights.ll | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/test/Transforms/SimplifyCFG/preserve-branchweights.ll b/test/Transforms/SimplifyCFG/preserve-branchweights.ll index 4b78747..beef527 100644 --- a/test/Transforms/SimplifyCFG/preserve-branchweights.ll +++ b/test/Transforms/SimplifyCFG/preserve-branchweights.ll @@ -250,6 +250,49 @@ end: ret i1 %ret } +define void @test10(i32 %x) nounwind readnone ssp noredzone { +entry: + switch i32 %x, label %lor.rhs [ + i32 2, label %lor.end + i32 1, label %lor.end + i32 3, label %lor.end + ], !prof !7 + +lor.rhs: + call void @helper(i32 1) nounwind + ret void + +lor.end: + call void @helper(i32 0) nounwind + ret void + +; CHECK: test10 +; CHECK: %x.off = add i32 %x, -1 +; CHECK: %switch = icmp ult i32 %x.off, 3 +; CHECK: br i1 %switch, label %lor.end, label %lor.rhs, !prof !8 +} + +; Remove dead cases from the switch. +define void @test11(i32 %x) nounwind { + %i = shl i32 %x, 1 + switch i32 %i, label %a [ + i32 21, label %b + i32 24, label %c + ], !prof !8 +; CHECK: %cond = icmp eq i32 %i, 24 +; CHECK: br i1 %cond, label %c, label %a, !prof !9 + +a: + call void @helper(i32 0) nounwind + ret void +b: + call void @helper(i32 1) nounwind + ret void +c: + call void @helper(i32 2) nounwind + 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} @@ -258,6 +301,7 @@ end: !5 = metadata !{metadata !"branch_weights", i32 7, i32 6, i32 5} !6 = metadata !{metadata !"branch_weights", i32 1, i32 3} !7 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8, i32 7} +!8 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8} ; CHECK: !0 = metadata !{metadata !"branch_weights", i32 5, i32 11} ; CHECK: !1 = metadata !{metadata !"branch_weights", i32 1, i32 5} @@ -267,4 +311,6 @@ end: ; CHECK: !5 = metadata !{metadata !"branch_weights", i32 17, i32 15} ; CHECK: !6 = metadata !{metadata !"branch_weights", i32 9, i32 7} ; CHECK: !7 = metadata !{metadata !"branch_weights", i32 17, i32 9, i32 8, i32 7, i32 17} -; CHECK-NOT: !8 +; CHECK: !8 = metadata !{metadata !"branch_weights", i32 24, i32 33} +; CHECK: !9 = metadata !{metadata !"branch_weights", i32 8, i32 33} +; CHECK-NOT: !9 |