4c90d977db
Flatten the profile pre-thinlink so that ThinLTO has something to work with for the parts of the binary that aren't covered by contextual profiles. Post-thinlink, the flattener is re-run and will actually change profile info, but just for the modules containing contextual trees ("specialized modules"). For the rest, the flattener just yanks out the instrumentation.
59 lines
1.5 KiB
LLVM
59 lines
1.5 KiB
LLVM
; Check that flattened profile lowering handles cold subgraphs that end in "unreachable"
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; RUN: split-file %s %t
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; RUN: llvm-ctxprof-util fromYAML --input=%t/profile.yaml --output=%t/profile.ctxprofdata
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; RUN: opt -passes=ctx-prof-flatten %t/1234.ll -use-ctx-profile=%t/profile.ctxprofdata -S -o - | FileCheck %s
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; CHECK-LABEL: entry:
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; CHECK: br i1 %t, label %yes, label %no, !prof ![[C1:[0-9]+]]
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; CHECK-LABEL: no:
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; CHECK-NOT: !prof
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; CHECK-LABEL: no1:
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; CHECK-NOT: !prof
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; CHECK-LABEL: no2:
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; CHECK-NOT: !prof
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; CHECK-LABEL: yes:
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; CHECK: br i1 %t3, label %yes1, label %yes2, !prof ![[C1]]
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; CHECK-NOT: !prof
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; CHECK: ![[C1]] = !{!"branch_weights", i32 6, i32 0}
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;--- 1234.ll
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define void @f1(i32 %cond) !guid !0 {
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entry:
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call void @llvm.instrprof.increment(ptr @f1, i64 42, i32 42, i32 0)
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%t = icmp eq i32 %cond, 1
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br i1 %t, label %yes, label %no
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no:
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%t2 = icmp eq i32 %cond, 2
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br i1 %t2, label %no1, label %no2
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no1:
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unreachable
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no2:
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call void @llvm.instrprof.increment(ptr @f1, i64 42, i32 42, i32 1)
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unreachable
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yes:
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%t3 = icmp eq i32 %cond, 3
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br i1 %t3, label %yes1, label %yes2
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yes1:
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br label %exit
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yes2:
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call void @llvm.instrprof.increment(ptr @f1, i64 42, i32 42, i32 2)
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%t4 = icmp eq i32 %cond, 4
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br i1 %t4, label %yes3, label %yes4
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yes3:
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br label %exit
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yes4:
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call void @llvm.instrprof.increment(ptr @f1, i64 42, i32 42, i32 3)
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unreachable
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exit:
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ret void
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}
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!0 = !{i64 1234}
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;--- profile.yaml
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Contexts:
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- Guid: 1234
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TotalRootEntryCount: 12
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Counters: [6,0,0,0]
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