1dd39b1133
Function entry count might be zero after the profile counts reset and before reentry to the function. Zero profile entry count is very bad as the profile count from BFI will be wrong. A simple fix is to set the profile entry count to 1 if there are non-zero profile counts in this function. Differential Revision: https://reviews.llvm.org/D84378
35 lines
1.2 KiB
LLVM
35 lines
1.2 KiB
LLVM
; RUN: llvm-profdata merge %S/Inputs/fix_entry_count.proftext -o %t.profdata
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; RUN: opt < %s -pgo-instr-use -pgo-instrument-entry=true -pgo-test-profile-file=%t.profdata -S | FileCheck %s --check-prefix=USE
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; RUN: opt < %s -passes=pgo-instr-use -pgo-instrument-entry=true -pgo-test-profile-file=%t.profdata -S | FileCheck %s --check-prefix=USE
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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_simple_for(i32 %n) {
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; USE: define i32 @test_simple_for(i32 %n)
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; USE-SAME: !prof ![[ENTRY_COUNT:[0-9]*]]
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entry:
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br label %for.cond
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for.cond:
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%i = phi i32 [ 0, %entry ], [ %inc1, %for.inc ]
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%sum = phi i32 [ 1, %entry ], [ %inc, %for.inc ]
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%cmp = icmp slt i32 %i, %n
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br i1 %cmp, label %for.body, label %for.end
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; USE: br i1 %cmp, label %for.body, label %for.end
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; USE-SAME: !prof ![[BW_FOR_COND:[0-9]+]]
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for.body:
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%inc = add nsw i32 %sum, 1
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br label %for.inc
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for.inc:
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%inc1 = add nsw i32 %i, 1
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br label %for.cond
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for.end:
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ret i32 %sum
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}
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; USE: ![[ENTRY_COUNT]] = !{!"function_entry_count", i64 1}
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; USE: ![[BW_FOR_COND]] = !{!"branch_weights", i32 96, i32 1}
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