bolt/test/X86/bug-reorder-bb-jrcxz.s

   1 ## Check that BOLT handles code with jrcxz instruction that has a one-byte
   2 ## signed offset restriction. If we try to separate jrcxz instruction from its
   3 ## destination, e.g. by placing it in a different code fragment, then the link
   4 ## step will fail.
   5
   6 # REQUIRES: system-linux
   7
   8 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
   9 # RUN: link_fdata %s %t.o %t.fdata
  10 # RUN: llvm-strip --strip-unneeded %t.o
  11 # RUN: %clang %cflags %t.o -o %t.exe -Wl,-q
  12
  13 ## Disable relocation mode to leave main fragment in its original location.
  14
  15 # RUN: llvm-bolt %t.exe -o %t.bolt --data %t.fdata --reorder-blocks=ext-tsp \
  16 # RUN:   --split-functions --relocs=0
  17
  18         .text
  19         .globl main
  20         .type   main,@function
  21 main:
  22 # FDATA: 0 [unknown] 0 1 main 0 0 1
  23 # FDATA: 1 main 0 1 main #.hot# 0 1
  24 .cfi_startproc
  25   jrcxz .Lcold
  26 .hot:
  27   ret
  28
  29 .Lcold:
  30   xorl %eax,%eax
  31   ret
  32 .cfi_endproc
  33 .size  main,.-main