[Bug target/93505] [8/9/10 Regression] wrong code or ICE with __builtin_bswap64() and rotation at -Og

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93505

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Bisection shows this started with my r8-3850-g39382c092ee9bb5c00330 change.
If I change the testcase slightly (still -Og):
unsigned a;

unsigned
foo (unsigned x)
{
  unsigned y = __builtin_bswap64 (-a);
  x = x >> y | x << (-y & 31);
  x >>= 31;
  return x;
}

int
main ()
{
  unsigned x = foo (~0);
  if (x != 1)
    __builtin_abort ();
  return 0;
}
it started in between r225210 and r227605, but have trouble building cross
compilers in that range.
Anyway, what happens is with the out of bounds rotate we get:
Trying 13 -> 16:
   13: r129:SI=r132:DI#0<-<0x20
      REG_DEAD r132:DI
   16: r123:DI=r129:SI<0
      REG_DEAD r129:SI
Successfully matched this instruction:
(set (reg/v:DI 123 [ <retval> ])
    (const_int 0 [0]))
during combine.  So, perhaps we could also change simplify-rtx.c to punt if it
is out of bounds rather than trying to optimize anything.