[PATCH, i386]: FIx PR target/12329, x86: local function declared with attribute((regparm(3))) gets corrupted parent frame pointer

[Uros Bizjak]

H.J. Lu wrote:

>> +
>> +int test_nested (int i)
>> +{
>> +  int __attribute__ ((__noinline__, __regparm__(3))) foo (int j, int k, int l)
>> +  {
>> +    return i + j + k + l;
>> +  }
>>     
>
> The problem is nested function with regparm,  not stack realign.
> Nested function and regparm use ecx for different purposes. We
> should limit regparm here.
>   

OK, I'll just reject regparm(3) in nested functions and leave 
__force_align_arg_pointer__ to be fixed by stack branch merge.  I'll 
leave both functions in the testcase (XFAILed until merge), just in case.

Thanks,
Uros.