On Sun, 24 Jan 2010 21:59:38 -0500, Walter Bright
<[email protected]> wrote:
dsimcha wrote:
Just out of curiosity, how hard is 64-bit to implement given that you
already have
a 32-bit compiler?
Shouldn't be that bad. After all, the current code generator survived
going from 16 to 32 bits with about 90% of it unchanged.
But don't 16-bit and 32-bit x86 have the same number of registers, while
x86-64 doubled them? Which should result in ABI changes, etc in addition
to optimizer changes. Also, FWIW, according to Wikipedia, position
independent code is also easier and they threw out some old instructions.
