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0eba98aa7d
Summary: Select instruction annotation in IR PGO uses the edge count to infer the branch count. It's currently placed in setInstrumentedCounts() where no all the BB counts have been computed. This leads to wrong branch weights. Move the annotation after all BB counts are populated. Reviewers: davidxl Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D25961 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285128 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.3 KiB
LLVM
38 lines
1.3 KiB
LLVM
; RUN: llvm-profdata merge %S/Inputs/select2.proftext -o %t.profdata
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; RUN: opt < %s -pgo-instr-use -pgo-test-profile-file=%t.profdata -pgo-instr-select=true -S | FileCheck %s --check-prefix=USE
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; RUN: opt < %s -passes=pgo-instr-use -pgo-test-profile-file=%t.profdata -pgo-instr-select=true -S | FileCheck %s --check-prefix=USE
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target datalayout = "e-m:e-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 @foo(i32 %n) {
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;USE: define i32 @foo(i32 %n) !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.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%sum.0 = phi i32 [ 0, %entry ], [ %add, %for.inc ]
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%cmp = icmp slt i32 %i.0, %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, !prof ![[BW_FOR_BR:[0-9]+]]
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for.body:
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%cmp1 = icmp sgt i32 %sum.0, 10
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%cond = select i1 %cmp1, i32 20, i32 -10
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;USE: %cond = select i1 %cmp1, i32 20, i32 -10, !prof ![[BW_FOR_SELECT:[0-9]+]]
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%add = add nsw i32 %sum.0, %cond
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br label %for.inc
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for.inc:
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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for.end:
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ret i32 %sum.0
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}
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;USE: ![[ENTRY_COUNT]] = !{!"function_entry_count", i64 3}
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;USE: ![[BW_FOR_BR]] = !{!"branch_weights", i32 800, i32 3}
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;USE: ![[BW_FOR_SELECT]] = !{!"branch_weights", i32 300, i32 500}
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