1; RUN: rm -rf %t && split-file %s %t 2 3; RUN: llvm-profdata merge %t/main.proftext -o %t/main.profdata 4; RUN: opt < %t/main.ll -passes=pgo-instr-use -pgo-test-profile-file=%t/main.profdata -S | FileCheck %s 5 6;--- main.ll 7 8; Instrumentation PGO sampling makes corrupt looking counters possible. This 9; tests one extreme case: 10; Test loading zero profile counts for all instrumented blocks while the entry 11; block is not instrumented. Additionally include a non-zero profile count for 12; a select instruction, which prevents short circuiting the PGO application. 13 14target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 15target triple = "x86_64-unknown-linux-gnu" 16 17define i32 @test_no_entry_block_counter(i32 %n) { 18; CHECK: define i32 @test_no_entry_block_counter(i32 %n) 19; CHECK-SAME: !prof ![[ENTRY_COUNT:[0-9]*]] 20entry: 21 %cmp = icmp slt i32 42, %n 22 br i1 %cmp, label %tail1, label %tail2 23tail1: 24 %ret = select i1 true, i32 %n, i32 42 25; CHECK: %ret = select i1 true, i32 %n, i32 42 26; CHECK-SAME: !prof ![[BW_FOR_SELECT:[0-9]+]] 27 ret i32 %ret 28tail2: 29 ret i32 42 30} 31; CHECK: ![[ENTRY_COUNT]] = !{!"function_entry_count", i64 1} 32; CHECK: ![[BW_FOR_SELECT]] = !{!"branch_weights", i32 1, i32 0} 33 34;--- main.proftext 35:ir 36test_no_entry_block_counter 37431494656217155589 383 390 400 411 42 43