[Bug middle-end/34226] [4.3 Regression][frv] ICE in default_secondary_reload, at targhooks.c:612

["rask at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from rask at gcc dot gnu dot org  2007-11-26 17:27 -------
This seems to have started with revision 130333, but I don't think that change
is to blame:

(gdb) bt
#0  frv_secondary_reload_class (class=ICC_REGS, mode=BImode, x=0x2b0f0ec48d80,
in_p=0) at /n/12/rask/src/all/gcc/config/frv/frv.c:6347
#1  0x000000000073430a in default_secondary_reload (in_p=0 '\0',
x=0x2b0f0ec48d80, reload_class=GPR_REGS, reload_mode=BImode,
sri=0x7fff9c430880)
    at /n/12/rask/src/all/gcc/targhooks.c:595
#2  0x00000000006bca5c in secondary_reload_class (in_p=1 '\001',
class=GPR_REGS, mode=VOIDmode, x=0x7) at /n/12/rask/src/all/gcc/reload.c:525
#3  0x00000000006aa82f in init_regs () at
/n/12/rask/src/all/gcc/regclass.c:1285
#4  0x0000000000737032 in backend_init_target () at
/n/12/rask/src/all/gcc/toplev.c:2040
#5  0x000000000073751a in toplev_main (argc=<value optimized out>, argv=<value
optimized out>) at /n/12/rask/src/all/gcc/toplev.c:2086
#6  0x00002b0f0ea1d4ca in __libc_start_main () from /lib/libc.so.6
#7  0x0000000000403c2a in _start () at ../sysdeps/x86_64/elf/start.S:113
(gdb) fin
Run till exit from #0  frv_secondary_reload_class (class=ICC_REGS, mode=BImode,
x=0x2b0f0ec48d80, in_p=0) at /n/12/rask/src/all/gcc/config/frv/frv.c:6347
default_secondary_reload (in_p=0 '\0', x=0x2b0f0ec48d80, reload_class=GPR_REGS,
reload_mode=BImode, sri=0x7fff9c430880)
    at /n/12/rask/src/all/gcc/targhooks.c:597
Value returned is $16 = GPR_REGS

The next few lines of code read:
  if (class != NO_REGS)
    {
      enum insn_code icode = (in_p ? reload_in_optab[(int) reload_mode]
                              : reload_out_optab[(int) reload_mode]);

(gdb) print icode
$19 = 0
(gdb) print insn_data[0]->name
$20 = 0xb8e5ba "*movqi_load"
(gdb) print insn_data[0]->n_operands
$21 = 2 '\002'

   I.e. we get the wrong icode.

(gdb) print reload_in_optab
$22 = {0 <repeats 45 times>}
(gdb) print reload_out
$23 = {0 <repeats 45 times>}

   I would have expected a default of CODE_FOR_nothing, not 0. I think this is
a problem with the new lazy optab initialization. We now call
backend_init_target() and init_regs() before calling init_optabs().


-- 

rask at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |middle-end


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34226