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| author | Nick Lewycky <nicholas@mxc.ca> | 2011-12-27 04:31:52 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2011-12-27 04:31:52 +0000 |
| commit | 06cc66f65a5012471835068029f3f4943790f584 (patch) | |
| tree | ad0e9335fcb3e0ec2bd561121bc618b377de7527 /test/Transforms/SimplifyCFG/preserve-branchweights.ll | |
| parent | da32cc6176d8ca2cd9cf387f5818ae911c91dc3c (diff) | |
| download | external_llvm-06cc66f65a5012471835068029f3f4943790f584.zip external_llvm-06cc66f65a5012471835068029f3f4943790f584.tar.gz external_llvm-06cc66f65a5012471835068029f3f4943790f584.tar.bz2 | |
Teach simplifycfg to recompute branch weights when merging some branches, and
to discard weights when appropriate. Still more to do (and a new TODO), but
it's a start!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147286 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/SimplifyCFG/preserve-branchweights.ll')
| -rw-r--r-- | test/Transforms/SimplifyCFG/preserve-branchweights.ll | 66 |
1 files changed, 64 insertions, 2 deletions
diff --git a/test/Transforms/SimplifyCFG/preserve-branchweights.ll b/test/Transforms/SimplifyCFG/preserve-branchweights.ll index dab0d7c..5ef1c6c 100644 --- a/test/Transforms/SimplifyCFG/preserve-branchweights.ll +++ b/test/Transforms/SimplifyCFG/preserve-branchweights.ll @@ -10,6 +10,45 @@ entry: X: %c = or i1 %b, false + br i1 %c, label %Z, label %Y, !prof !1 + +Y: + call void @helper(i32 0) + ret void + +Z: + call void @helper(i32 1) + ret void +} + +define void @test2(i1 %a, i1 %b) { +; CHECK: @test2 +entry: + br i1 %a, label %X, label %Y, !prof !1 +; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !1 +; CHECK-NOT: !prof + +X: + %c = or i1 %b, false + br i1 %c, label %Z, label %Y, !prof !2 + +Y: + call void @helper(i32 0) + ret void + +Z: + call void @helper(i32 1) + ret void +} + +define void @test3(i1 %a, i1 %b) { +; CHECK: @test3 +; CHECK-NOT: !prof +entry: + br i1 %a, label %X, label %Y, !prof !1 + +X: + %c = or i1 %b, false br i1 %c, label %Z, label %Y Y: @@ -21,6 +60,29 @@ Z: ret void } -!0 = metadata !{metadata !"branch_weights", i32 1, i32 2} +define void @test4(i1 %a, i1 %b) { +; CHECK: @test4 +; CHECK-NOT: !prof +entry: + br i1 %a, label %X, label %Y + +X: + %c = or i1 %b, false + br i1 %c, label %Z, label %Y, !prof !1 + +Y: + call void @helper(i32 0) + ret void + +Z: + call void @helper(i32 1) + 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} -; CHECK: !0 = metadata !{metadata !"branch_weights", i32 2, i32 1} +; CHECK: !0 = metadata !{metadata !"branch_weights", i32 5, i32 11} +; CHECK: !1 = metadata !{metadata !"branch_weights", i32 1, i32 5} +; CHECK-NOT: !2 |