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author | Chandler Carruth <chandlerc@gmail.com> | 2011-10-19 10:32:19 +0000 |
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committer | Chandler Carruth <chandlerc@gmail.com> | 2011-10-19 10:32:19 +0000 |
commit | 941aa7b1e8c1b77544d643e8b23ff07f7f83f281 (patch) | |
tree | 651ee5eb067c9eb0e6cfc0c43d3a2762c4fdb1ef /test/Analysis/BlockFrequencyInfo | |
parent | 99d01c54a0fd790a48d5aa02bfeb4cc08388b8fa (diff) | |
download | llvm-941aa7b1e8c1b77544d643e8b23ff07f7f83f281.tar.gz llvm-941aa7b1e8c1b77544d643e8b23ff07f7f83f281.tar.bz2 llvm-941aa7b1e8c1b77544d643e8b23ff07f7f83f281.tar.xz |
Generalize the reading of probability metadata to work for both branches
and switches, with arbitrary numbers of successors. Still optimized for
the common case of 2 successors for a conditional branch.
Add a test case for switch metadata showing up in the BlockFrequencyInfo pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142493 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Analysis/BlockFrequencyInfo')
-rw-r--r-- | test/Analysis/BlockFrequencyInfo/basic.ll | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/test/Analysis/BlockFrequencyInfo/basic.ll b/test/Analysis/BlockFrequencyInfo/basic.ll index f043dc08e4..540d06b1f5 100644 --- a/test/Analysis/BlockFrequencyInfo/basic.ll +++ b/test/Analysis/BlockFrequencyInfo/basic.ll @@ -47,3 +47,46 @@ exit: } !0 = metadata !{metadata !"branch_weights", i32 64, i32 4} + +define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) { +; CHECK: Printing analysis {{.*}} for function 'test3' +; CHECK: entry = 1024 +entry: + switch i32 %i, label %case_a [ i32 1, label %case_b + i32 2, label %case_c + i32 3, label %case_d + i32 4, label %case_e ], !prof !1 + +; CHECK: case_a = 51 +case_a: + br label %exit + +; CHECK: case_b = 51 +case_b: + br label %exit + +; The 'case_c' branch is predicted more likely via branch weight metadata. +; CHECK: case_c = 819 +case_c: + br label %exit + +; CHECK: case_d = 51 +case_d: + br label %exit + +; CHECK: case_e = 51 +case_e: + br label %exit + +; FIXME: It may be a bug that we don't sum back to 1024. +; CHECK: exit = 1023 +exit: + %result = phi i32 [ %a, %case_a ], + [ %b, %case_b ], + [ %c, %case_c ], + [ %d, %case_d ], + [ %e, %case_e ] + ret i32 %result +} + +!1 = metadata !{metadata !"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4} |