On 09/22/2015 12:18 PM, Jeff Law wrote:
> On 09/22/2015 01:15 PM, Richard Henderson wrote:
>>> And doesn't it have to be =& and always at the start for an asm constraint?
>>> For operands in patterns, we have to consider operand alternatives, but
>>> that's
>>> not on issue here.
>>
>> Technically we do support alternatives on asms. Not usefully except for
>> CISC,
>> since all alternatives have to use the same output pattern, but one can write
>> things like
>>
>> asm("add %0,%1" : "=r,m"(x) : "rim,ri"(y))
> Wow, learn something every day. In that case, I think we do have to search a
> little harder than just peeking at the first two letters of the constraint :(
We wouldn't be. He's adding this check at the beginning of each alternative.
So why would we want to search the entire rest of the string now?
r~
