[Bug tree-optimization/81861] ASan pr64820.c testcase segfaults with LTO and -fstack-protector-strong

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81861

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
You didn't specify compile flags, but using:

-O2 -fstack-protector-strong -fsanitize=address, I get:

  51:   c7 82 00 80 ff 7f f1    movl   $0xf1f1f1f1,0x7fff8000(%rdx)
  58:   f1 f1 f1 
  5b:   c7 82 04 82 ff 7f f3    movl   $0xf3f3f3f3,0x7fff8204(%rdx)
  62:   f3 f3 f3 
  65:   64 48 8b 04 25 28 00    mov    %fs:0x28,%rax
  6c:   00 00 
  6e:   48 89 84 24 58 10 00    mov    %rax,0x1058(%rsp)
  75:   00 
  76:   31 c0                   xor    %eax,%eax

The insn in question is:

#(insn:TI 35 19 40 3 (parallel [
#            (set (mem/v/f/c:DI (plus:DI (reg/f:DI 7 sp)
#                        (const_int 4184 [0x1058])) [2 D.2177+0 S8 A64])
#                (unspec:DI [
#                        (mem/f:DI (const_int 40 [0x28]) [4
MEM[(<address-space-1> long unsigned int *)40B]+0 S8 A64 AS1])
#                    ] UNSPEC_SP_SET))
#            (set (reg:DI 0 ax [97])
#                (const_int 0 [0]))
#            (clobber (reg:CC 17 flags))
#        ]) "pr64820.c":13 1002 {stack_protect_set_di}
#     (expr_list:REG_UNUSED (reg:CC 17 flags)
#        (expr_list:REG_UNUSED (reg:DI 0 ax [97])
#            (nil))))
        movq    %fs:40, %rax    # 35    stack_protect_set_di    [length = 16]
        movq    %rax, 4184(%rsp)
        xorl    %eax, %eax

Maybe LTO doesn't handle address spaces correctly?