[Bug rtl-optimization/88168] New: -fno-jump-tables still generates jump table

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88168

            Bug ID: 88168
           Summary: -fno-jump-tables still generates jump table
           Product: gcc
           Version: 8.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

[hjl@gnu-cfl-1 microbenchmark]$ cat switch.c
int
foo (int i)
{
  int j;
  switch (i)
    {
    case 0:
      j = 3;
      break;
    case 2:
      j = 9;
      break;
    case 3:
      j = 23;
      break;
    case 8:
      j = 43;
      break;
    default:
      j = 31;
      break;
    }
  return j;
}
[hjl@gnu-cfl-1 microbenchmark]$ /usr/gcc-8.1.1-x32/bin/gcc -S -O2 switch.c
-fno-jump-tables
[hjl@gnu-cfl-1 microbenchmark]$ cat switch.s
        .file   "switch.c"
        .text
        .p2align 4,,15
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        movl    $31, %eax
        cmpl    $8, %edi
        ja      .L1
        movl    %edi, %edi
        movl    CSWTCH.0(,%rdi,4), %eax
.L1:
        ret
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .section        .rodata
        .align 32
        .type   CSWTCH.0, @object
        .size   CSWTCH.0, 36
CSWTCH.0:
        .long   3
        .long   31
        .long   9
        .long   23
        .long   31
        .long   31
        .long   31
        .long   31
        .long   43
        .ident  "GCC: (GNU) 8.1.1 20180521"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-1 microbenchmark]$