Help with a DMD patch

[Daniel Murphy]

"Vladimir Panteleev" <vladimir at thecybershadow.net> wrote in message 
news:pzqxkiigdvvicqkqahpn at forum.dlang.org...
> I'm trying to cut my teeth on DMD hacking with a simple optimization ( 
> http://d.puremagic.com/issues/show_bug.cgi?id=9477 ), but not having much 
> luck so far - the backend is rejecting my attempts with asserts here or 
> there. Since the asserts have no error messages, and the code is very 
> terse, often un-straightforward and lacking in comments, I have no idea if 
> I'm feeding it bad input or if it's some latent bug.
>
> Here's my work so far:
> https://github.com/CyberShadow/dmd/compare/fix9477-work
>
> Could a DMD guru have a look and tell me what I'm doing wrong?
>
> Tests:
> https://gist.github.com/CyberShadow/5177509

Instead of copying elems, try to generate something like this:

(auto tmp1 = e1, auto tmp2 = e2, tmp1.length == tmp2.length && 
!memcmp(tmp1.ptr, tmp2.ptr))

There is code in e2ir that already does stuff like this.

Not really the easiest part of dmd to hack on....