http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54814
Steven Bosscher <steven at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |steven at gcc dot gnu.org
--- Comment #5 from Steven Bosscher <steven at gcc dot gnu.org> 2012-12-07
22:41:02 UTC ---
For 20010426-1.c at -O1:
(gdb) p debug_rtx(insn)
(insn 168 167 169 10 (set (reg:QI 3 r3 [orig:118 a_I_m_lsm.5+1 ] [118])
(subreg:QI (reg/f:HI 105 [ a_I_m_lsm.5 ]) 1)) 20010426-1.c:12 70
{movqi_insn}
(nil))
$1 = void
(gdb) p debug_reload_to_stream(stderr)
Reload 0: reload_in (HI) = (symbol_ref/f:HI ("*.LC0") [flags 0x2] <var_decl
0x7ffff63f0720 *.LC0>)
R0_REG, RELOAD_FOR_INPUT (opnum = 1)
reload_in_reg: (symbol_ref/f:HI ("*.LC0") [flags 0x2] <var_decl
0x7ffff63f0720 *.LC0>)
Reload 1: reload_in (QI) = (subreg:QI (symbol_ref/f:HI ("*.LC0") [flags 0x2]
<var_decl 0x7ffff63f0720 *.LC0>) 1)
GENERAL_REGS, RELOAD_FOR_INPUT (opnum = 1), can't combine
reload_in_reg: (subreg:QI (reg/f:HI 105 [ a_I_m_lsm.5 ]) 1)
reload_reg_rtx: (reg:QI 3 r3 [orig:118 a_I_m_lsm.5+1 ] [118])
$2 = void
For 930120-1.c at -O2:
Breakpoint 1, spill_failure (insn=0x7ffff6444990, rclass=R0_REG) at
../../trunk/gcc/reload1.c:2108
2108 if (asm_noperands (PATTERN (insn)) >= 0)
(gdb) p debug_rtx(insn)
(insn 173 170 176 28 (set (mem:QI (post_dec:HI (reg/f:HI 32 __SP_L__)) [0 S1
A8])
(subreg:QI (reg/f:HI 487) 1)) 930120-1.c:67 1 {pushqi1}
(expr_list:REG_ARGS_SIZE (const_int 3 [0x3])
(nil)))
$1 = void
(gdb) p debug_reload_to_stream(stderr)
Reload 0: reload_in (HI) = (symbol_ref/f:HI ("*.LC2") [flags 0x2] <var_decl
0x7ffff6420850 *.LC2>)
R0_REG, RELOAD_FOR_INPUT (opnum = 0)
reload_in_reg: (symbol_ref/f:HI ("*.LC2") [flags 0x2] <var_decl
0x7ffff6420850 *.LC2>)
Reload 1: reload_in (QI) = (subreg:QI (symbol_ref/f:HI ("*.LC2") [flags 0x2]
<var_decl 0x7ffff6420850 *.LC2>) 1)
GENERAL_REGS, RELOAD_FOR_INPUT (opnum = 0), can't combine
reload_in_reg: (subreg:QI (reg/f:HI 487) 1)
$2 = void
(gdb)
In both cases reload is trying to reload a symbol_ref to an R0_REG class.
