10f0c1aadd
With sampled instrumentation (#69535), profile counts may appear corrupt and `fixFuncEntryCount` may assert. In particular a function can have a 0 block count for its entry, while later blocks are non zero. This is only likely to happen for colder functions, so it is reasonable to take any action that does not crash. Here we simply bail from fixing the entry count.
43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; RUN: rm -rf %t && split-file %s %t
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; RUN: llvm-profdata merge %t/main.proftext -o %t/main.profdata
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; RUN: opt < %t/main.ll -passes=pgo-instr-use -pgo-test-profile-file=%t/main.profdata -S | FileCheck %s
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;--- main.ll
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; Instrumentation PGO sampling makes corrupt looking counters possible. This
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; tests one extreme case:
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; Test loading zero profile counts for all instrumented blocks while the entry
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; block is not instrumented. Additionally include a non-zero profile count for
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; a select instruction, which prevents short circuiting the PGO application.
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @test_no_entry_block_counter(i32 %n) {
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; CHECK: define i32 @test_no_entry_block_counter(i32 %n)
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; CHECK-SAME: !prof ![[ENTRY_COUNT:[0-9]*]]
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entry:
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%cmp = icmp slt i32 42, %n
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br i1 %cmp, label %tail1, label %tail2
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tail1:
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%ret = select i1 true, i32 %n, i32 42
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; CHECK: %ret = select i1 true, i32 %n, i32 42
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; CHECK-SAME: !prof ![[BW_FOR_SELECT:[0-9]+]]
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ret i32 %ret
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tail2:
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ret i32 42
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}
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; CHECK: ![[ENTRY_COUNT]] = !{!"function_entry_count", i64 1}
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; CHECK: ![[BW_FOR_SELECT]] = !{!"branch_weights", i32 1, i32 0}
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;--- main.proftext
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:ir
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test_no_entry_block_counter
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431494656217155589
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3
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0
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0
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1
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