On 7/10/19 8:21 PM, Jan Bobek wrote: > Doesn't B8 (without REX.W) work for x86_64, too? It zeroes the upper > part of the destination, so it's effectively zero-extending, and it's > one byte shorter than C7 (no ModR/M byte needed).
Sorry, I shouldn't have been quite so terse. What I meant is if (!$is_x86_64 || (0 <= $imm && $imm <= 0xffffffff)) so that 32-bit always uses the 5-byte encoding instead of the 6-byte. > That being said, I moved most of this function to risugen_x86_asm and > included a bunch of comments regarding different cases, so it should > be easier to understand. Great. r~
