bolt/test/X86/nolbr.s

   1 # This reproduces a bug where profile collected from perf without LBRs and
   2 # converted into fdata-no-lbr format is reported to not contain profile for any
   3 # functions.
   4
   5 # REQUIRES: system-linux
   6
   7 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
   8 # RUN:   %s -o %t.o
   9 # RUN: link_fdata --no-lbr %s %t.o %t.fdata
  10 # RUN: FileCheck %s --input-file %t.fdata --check-prefix=CHECK-FDATA
  11 # RUN: llvm-strip --strip-unneeded %t.o
  12 # RUN: %clang %cflags %t.o -o %t.exe -Wl,-q -nostdlib
  13 # RUN: llvm-bolt %t.exe -o %t.out --data %t.fdata --dyno-stats -nl \
  14 # RUN:    --print-only=_start 2>&1 | FileCheck %s --check-prefix=CHECK-BOLT
  15
  16 # CHECK-FDATA:      no_lbr
  17 # CHECK-FDATA-NEXT: 1 _start [[#]] 1
  18
  19 # CHECK-BOLT: BOLT-INFO: pre-processing profile using branch profile reader
  20 # CHECK-BOLT: BOLT-INFO: operating with basic samples profiling data (no LBR).
  21 # CHECK-BOLT: BOLT-INFO: 1 out of 1 functions in the binary (100.0%) have non-empty execution profile
  22
  23   .globl _start
  24   .type _start, %function
  25 _start:
  26   pushq %rbp
  27   movq  %rsp, %rbp
  28   cmpl  $0x0, %eax
  29 a:
  30 # FDATA: 1 _start #a# 1
  31   je b
  32   movl  $0x0, %eax
  33   jmp c
  34 b:
  35   movl  $0x1, %eax
  36 c:
  37   popq  %rbp
  38   retq
  39 .size _start, .-_start