[Bug rtl-optimization/116238] [15 Regression] ICE building 526.blender_r on aarch64 SVE after r15-1619-g3b9b8d6cfdf593

[rsandifo at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116238

Richard Sandiford <rsandifo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rsandifo at gcc dot 
gnu.org

--- Comment #5 from Richard Sandiford <rsandifo at gcc dot gnu.org> ---
Yeah, seems to be a latent bug in aarch64_hard_regno_caller_save_mode.  A
brute-force reproducer is:

void foo();
typedef unsigned char v2qi __attribute__((vector_size(2)));
void f(v2qi *ptr)
{
  v2qi x = *ptr;
  asm volatile ("" :: "w" (x));
  asm volatile ("" ::: "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15");
  foo();
  asm volatile ("" :: "w" (x));
  *ptr = x;
}