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 14:54:00 GMT 2011


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.

Thanks.

-- 
H.J.



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