diff options
| author | Manman Ren <mren@apple.com> | 2012-09-15 00:39:57 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-09-15 00:39:57 +0000 |
| commit | 062986c2f0a020c0652010e3c8549653397048f4 (patch) | |
| tree | 120e419524ae376b89f5a68d8480e01ce712ea86 /test | |
| parent | 3cbd1786ac06fe751dc4b5ad55e75115cb1d51ce (diff) | |
PGO: preserve branch-weight metadata when simplifying two branches with a common
destination.
Updated previous implementation to fix a case not covered:
// PBI: br i1 %x, TrueDest, BB
// BI: br i1 %y, TrueDest, FalseDest
The other case was handled correctly.
// PBI: br i1 %x, BB, FalseDest
// BI: br i1 %y, TrueDest, FalseDest
Also tried to use 64-bit arithmetic instead of APInt with scale to simplify the
computation. Let me know if you have other opinions about this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163954 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/SimplifyCFG/preserve-branchweights.ll | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/test/Transforms/SimplifyCFG/preserve-branchweights.ll b/test/Transforms/SimplifyCFG/preserve-branchweights.ll index 93bbcfb38c..1564e4e11d 100644 --- a/test/Transforms/SimplifyCFG/preserve-branchweights.ll +++ b/test/Transforms/SimplifyCFG/preserve-branchweights.ll @@ -154,6 +154,26 @@ sw.epilog: ret void } +;; This test is based on test1 but swapped the targets of the second branch. +define void @test1_swap(i1 %a, i1 %b) { +; CHECK: @test1_swap +entry: + br i1 %a, label %Y, label %X, !prof !0 +; CHECK: br i1 %or.cond, label %Y, label %Z, !prof !4 + +X: + %c = or i1 %b, false + br i1 %c, label %Y, label %Z, !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} @@ -165,4 +185,5 @@ sw.epilog: ; CHECK: !1 = metadata !{metadata !"branch_weights", i32 1, i32 5} ; CHECK: !2 = metadata !{metadata !"branch_weights", i32 7, i32 1, i32 2} ; CHECK: !3 = metadata !{metadata !"branch_weights", i32 49, i32 12, i32 24, i32 35} -; CHECK-NOT: !4 +; CHECK: !4 = metadata !{metadata !"branch_weights", i32 11, i32 5} +; CHECK-NOT: !5 |