[PATCH] powerpc: fix ifunc-sel.h with GCC 6

[Florian Weimer]

On 07/21/2016 01:53 PM, Florian Weimer wrote:
> On 07/21/2016 11:36 AM, Aurelien Jarno wrote:
>> On 32-bit PowerPC GCC 6 always saves the PIC register on the stack in
>> the prologue and adjust the stack in the epilogue. It is therefore not
>> possible anymore to just exit the function in the inline asm code,
>> otherwise it corrupts the stack pointer. This causes the following tests
>> to fail when using GCC 6:
>
>>         : "=r" (ret)
>>         : "X" (&global), "X" (f1), "X" (f2), "X" (f3));
>>    return ret;
>
> The inline assembly still lacks clobbers for registers 11 and 12, and
> the "X" constraint is incorrect (it should be "i", I think).

And a comment why bcl 20,31 is used instead of bl wouldn't hurt, either. 
  A colleague explained to me it's a hint to the implementation not to 
perform return stack optimization, although the observable effect is 
identical to bl.

Florian