PATCH [1/n]: Prepare x32: PR middle-end/47364: internal compiler error: in emit_move_insn, at expr.c:3355

H.J. Lu hjl.tools@gmail.com
Sun Jun 12 16:41:00 GMT 2011


On Sun, Jun 12, 2011 at 7:33 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Sun, Jun 12, 2011 at 7:00 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
>> On Sun, Jun 12, 2011 at 6:50 AM, Richard Guenther
>> <richard.guenther@gmail.com> wrote:
>>> On Sun, Jun 12, 2011 at 3:18 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
>>>> On Sun, Jun 12, 2011 at 3:48 AM, Richard Guenther
>>>> <richard.guenther@gmail.com> wrote:
>>>>> On Sat, Jun 11, 2011 at 5:09 PM, H.J. Lu <hongjiu.lu@intel.com> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> expand_builtin_strlen has
>>>>>>
>>>>>> src_reg = gen_reg_rtx (Pmode);
>>>>>> ...
>>>>>> pat = expand_expr (src, src_reg, ptr_mode, EXPAND_NORMAL);
>>>>>> if (pat != src_reg)
>>>>>>  emit_move_insn (src_reg, pat);
>>>>>>
>>>>>> But src_reg may be in ptr_mode, wich may not be the same as Pmode.
>>>>>> This patch checks it.  OK for trunk?
>>>>>>
>>>>>> Thanks.
>>>>>>
>>>>>>
>>>>>> H.J.
>>>>>> ---
>>>>>> 2011-06-11  H.J. Lu  <hongjiu.lu@intel.com>
>>>>>>
>>>>>>        PR middle-end/47364
>>>>>>        * builtins.c (expand_builtin_strlen): Properly handle target
>>>>>>        not in Pmode.
>>>>>>
>>>>>> diff --git a/gcc/builtins.c b/gcc/builtins.c
>>>>>> index 7b24a0c..4e2cf31 100644
>>>>>> --- a/gcc/builtins.c
>>>>>> +++ b/gcc/builtins.c
>>>>>> @@ -2941,7 +2941,11 @@ expand_builtin_strlen (tree exp, rtx target,
>>>>>>       start_sequence ();
>>>>>>       pat = expand_expr (src, src_reg, ptr_mode, EXPAND_NORMAL);
>>>>>>       if (pat != src_reg)
>>>>>> -       emit_move_insn (src_reg, pat);
>>>>>> +       {
>>>>>> +         if (GET_MODE (pat) != Pmode)
>>>>>> +           pat = convert_to_mode (Pmode, pat, 1);
>>>>>
>>>>> Shouldn't this be POINTERS_EXTEND_UNSIGNED instead of 1?
>>>>>
>>>>>> +         emit_move_insn (src_reg, pat);
>>>>>
>>>>> Why not use convert_move unconditionally?
>>>>>
>>>>> Or, why not expand src in Pmode from the start?  After all, src_reg is
>>>>> created as Pmode reg.
>>>>>
>>>>
>>>> This patch works for my testcase.  OK for trunk?
>>>
>>> Ok if it passes bootstrap & regtest on a ptr_mode != Pmode target.
>>>
>>
>> Only the following targets expand strlen:
>>
>> avr/avr.md:(define_expand "strlenhi"
>> avr/avr.md:(define_insn "*strlenhi"
>> i386/i386.md:(define_expand "strlen<mode>"
>> i386/i386.md: if (ix86_expand_strlen (operands[0], operands[1],
>> operands[2], operands[3]))
>> i386/i386.md:(define_expand "strlenqi_1"
>> i386/i386.md:(define_insn "*strlenqi_1"
>> rs6000/rs6000.md:(define_expand "strlensi"
>> s390/s390.md:; strlenM instruction pattern(s).
>> s390/s390.md:(define_expand "strlen<mode>"
>> s390/s390.md:(define_insn "*strlen<mode>"
>>
>> None of them, except for my x32 port, are ptr_mode != Pmode targets.
>> I will bootstrap and test it on my x32 branch.
>>
>
> It doesn't work on x32. I got
>
> /export/gnu/import/git/gcc-x32/libssp/gets-chk.c:74:14: internal
> compiler error: in emit_move_insn, at expr.c:3319
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.
>
> How about this patch?
>
> Thanks.

No regressions on x32 branch.  OK for trunk?

Thanks.

> --
> H.J.
> ---
> 2011-06-12  H.J. Lu  <hongjiu.lu@intel.com>
>
>        PR middle-end/47364
>        * builtins.c (expand_builtin_strlen): Properly handle target
>        not in Pmode.
>
> diff --git a/gcc/builtins.c b/gcc/builtins.c
> index 7b24a0c..a2f175d 100644
> --- a/gcc/builtins.c
> +++ b/gcc/builtins.c
> @@ -2941,7 +2941,14 @@ expand_builtin_strlen (tree exp, rtx target,
>       start_sequence ();
>       pat = expand_expr (src, src_reg, ptr_mode, EXPAND_NORMAL);
>       if (pat != src_reg)
> -       emit_move_insn (src_reg, pat);
> +       {
> +#ifdef POINTERS_EXTEND_UNSIGNED
> +         if (GET_MODE (pat) != Pmode)
> +           pat = convert_to_mode (Pmode, pat,
> +                                  POINTERS_EXTEND_UNSIGNED);
> +#endif
> +         emit_move_insn (src_reg, pat);
> +       }
>       pat = get_insns ();
>       end_sequence ();
>



-- 
H.J.



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