On 2020-05-08 10:21, Nick Desaulniers wrote:
>>
>> One last suggestion. Add the "b" modifier to the mask operand: "orb
>> %b1, %0". That forces the compiler to use the 8-bit register name
>> instead of trying to deduce the width from the input.
>
> Ah right:
> https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#x86Operandmodifiers
>
> Looks like that works for both compilers. In that case, we can likely
> drop the `& 0xff`, too. Let me play with that, then I'll hopefully
> send a v3 today.
>
Good idea. I requested a while ago that they document these modifiers; they
chose not to document them all which in some ways is good; it shows what they
are willing to commit to indefinitely.
-hpa
