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
