[Bug target/89355] New: Unnecessary ENDBR

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89355

            Bug ID: 89355
           Summary: Unnecessary ENDBR
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: crazylht at gmail dot com, xuepeng.guo at intel dot com
  Target Milestone: ---
            Target: i386,x86-64

[hjl@gnu-cfl-2 gcc]$ cat x.i
int
test (int* val)
{
  int status = 99;

  if((val == 0))
    {
      status = 22;
      goto end;
    }

  extern int x;
  *val = x;

  status = 0;
end:
  return status;
}

[hjl@gnu-cfl-2 gcc]$ ./xgcc -B./ -S -O2 -fcf-protection  x.i
[hjl@gnu-cfl-2 gcc]$ cat x.s
        .file   "x.i"
        .text
        .p2align 4
        .globl  test
        .type   test, @function
test:
.LFB0:
        .cfi_startproc
        endbr64
        testq   %rdi, %rdi
        je      .L3
        movl    x(%rip), %eax
        movl    %eax, (%rdi)
        xorl    %eax, %eax
        ret
        .p2align 4,,10
        .p2align 3
.L3:
.L2:
        endbr64  <<< Why is ENDBR here?  There is no indirect branch.
        movl    $22, %eax
        ret
        .cfi_endproc
.LFE0:
        .size   test, .-test
        .ident  "GCC: (GNU) 9.0.1 20190214 (experimental)"
        .section        .note.GNU-stack,"",@progbits
        .section        .note.gnu.property,"a"
        .align 8
        .long    1f - 0f
        .long    4f - 1f
        .long    5
0:
        .string  "GNU"
1:
        .align 8
        .long    0xc0000002
        .long    3f - 2f
2:
        .long    0x3
3:
        .align 8
4:
[hjl@gnu-cfl-2 gcc]$