Re: Lua string library partially reimplemented in Lua

["Alex Davies" <alex.mania@...>]

Mike Pall wrote:
>  [...]
>  lea edx, [ebx+esi]
>  mov eax, edx
>  xor eax, ebx
>  mov esi, ecx
>  [...]

I've been trying to figure out how jit 2.x manages to reduce numbers in this 
instance to integers. I can see that the band/bxor could guarantee that the 
numbers fit in the range, but the additions? The table access? Quite amazed. 
Is this some kind of combination of static range analysis with overflow 
exceptions? I really have no idea.

And pleased to see I'm not the only one that's been curious about speeding 
up lua sub string equality testing.

- Alex