[Bug c/97992] New: ICE in subst_asm_stack_regs, at reg-stack.c:2264

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97992

            Bug ID: 97992
           Summary: ICE in subst_asm_stack_regs, at reg-stack.c:2264
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Affects versions down to at least r5 :


$ cat z1.c
long double
f (long double x)
{
  double r;
  asm volatile ("fsqrt" : "=t"(r) : ""(x));
  return f (x * x);
}


$ gcc-11-20201122 -c z1.c -O2
during RTL pass: stack
z1.c: In function 'f':
z1.c:7:1: internal compiler error: in subst_asm_stack_regs, at reg-stack.c:2264
    7 | }
      | ^
0xabde0e subst_asm_stack_regs
        ../../gcc/reg-stack.c:2264
0xabf8ad subst_stack_regs
        ../../gcc/reg-stack.c:2425
0xabfc27 convert_regs_1
        ../../gcc/reg-stack.c:3080
0xabfc27 convert_regs_2
        ../../gcc/reg-stack.c:3214
0xac0ddd convert_regs
        ../../gcc/reg-stack.c:3249
0xac0ddd reg_to_stack
        ../../gcc/reg-stack.c:3374
0xac0ddd rest_of_handle_stack_regs
        ../../gcc/reg-stack.c:3429
0xac0ddd execute
        ../../gcc/reg-stack.c:3460