bolt/test/X86/issue20.s

   1 ## This reproduces issue 20 from our github repo
   2 ## "BOLT crashes when removing unreachable BBs that are a target
   3 ##   in a JT"
   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: %clang %cflags -no-pie %t.o -o %t.exe
  10 # RUN: llvm-bolt %t.exe --relocs=0 --jump-tables=move --print-finalized \
  11 # RUN:    -o %t.out | FileCheck %s
  12
  13 # CHECK-NOT: BOLT-INFO: UCE removed {{.*}} blocks and {{.*}} bytes of code
  14 # CHECK: Binary Function "main"
  15 # CHECK:      .LFT{{.*}} (2 instructions, align : 1)
  16 # CHECK-NEXT:     00000004:   andq
  17 # CHECK-NEXT:     00000008:   jmpq
  18 # CHECK-NEXT:   Successors: .Ltmp{{.*}}, .Ltmp{{.*}}, .Ltmp{{.*}}, .Ltmp{{.*}}
  19
  20
  21   .text
  22   .globl main
  23   .type main, %function
  24   .size main, .Lend1-main
  25 main:
  26   xorq %rax, %rax
  27   retq
  28   andq $3, %rdi
  29   jmpq *jumptbl(,%rdi,8)
  30
  31 .Lbb1:
  32   movl $0x1, %eax
  33   jmp .Lexit
  34 .Lbb2:
  35   movl $0x2, %eax
  36   jmp .Lexit
  37 .Lbb3:
  38   movl $0x3, %eax
  39   jmp .Lexit
  40 .Lbb4:
  41   movl $0x4, %eax
  42 .Lexit:
  43   retq
  44 .Lend1:
  45
  46   .section .rodata
  47   .globl jumptbl
  48 jumptbl:
  49   .quad .Lbb1
  50   .quad .Lbb2
  51   .quad .Lbb3
  52   .quad .Lbb4