[Bug target/79636] [5/6/7/8 Regression] ICE in assign_by_spills, at lra-assigns.c:1457

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79636

Vittorio Zecca <zeccav at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zeccav at gmail dot com

--- Comment #3 from Vittorio Zecca <zeccav at gmail dot com> ---
Still in trunk 249883:

/* from pr65693.c */
/* in trunk 249883 */
/* internal compiler error: in assign_by_spills, at lra-assigns.c */
void
foo (int (*fn) (int, int, int), unsigned int b)
{
  unsigned long *c = (unsigned long *) __builtin_alloca (b);
  register int d asm ("edx") = fn (0, 0, d);
}
/*
 * p.c: In function ‘foo’:
error: unable to find a register to spill
 }
 ^
error: this is the insn:
(insn 11 31 12 2 (parallel [
            (set (reg:DI 94)
                (udiv:DI (reg:DI 92)
                    (reg:DI 103)))
            (set (reg:DI 104 [95])
                (umod:DI (reg:DI 92)
                    (reg:DI 103)))
            (clobber (reg:CC 17 flags))
        ]) "p.c":7 370 {*udivmoddi4}
     (expr_list:REG_UNUSED (reg:DI 104 [95])
        (expr_list:REG_DEAD (reg:DI 103)
            (expr_list:REG_DEAD (reg:DI 92)
                (expr_list:REG_UNUSED (reg:CC 17 flags)
                    (nil))))))
during RTL pass: reload
internal compiler error: in assign_by_spills, at lra-assigns.c:1476
0x6216cc _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc-249883/gcc/rtl-error.c:108
0xaf2f5e assign_by_spills
        ../../gcc-249883/gcc/lra-assigns.c:1476
0xaf4276 lra_assign()
        ../../gcc-249883/gcc/lra-assigns.c:1670
0xaef29c lra(_IO_FILE*)
        ../../gcc-249883/gcc/lra.c:2451
0xaa7281 do_reload
        ../../gcc-249883/gcc/ira.c:5440
0xaa7281 execute
        ../../gcc-249883/gcc/ira.c:5624
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
*/