OpenEuphoria

Re: Changes in the ESL papers

• Posted by "Juergen Luethje" <j.lue at gmx.de> Jul 25, 2005
• 565 views

Christian Cuvier wrote:

> How about inline asm code to be call()ed? We may need a guideline to
> either avoid it

I think we should allow it, e.g. for routines that do bitwise operations.

> or standardize how the constants representing routines
> poked in memory will be written and commented. Some standardization of
> the parm block may be useful too.

The most important thing IMHO is that there must be readable asm
commands, I mean e.g.

it must be

-- SHIFT_LEFT
constant SHL_CODE = allocate(13)

poke(SHL_CODE, {
     -- First int argument is at stack offset +4, second int is at +8.
     -- Returns a *signed* 32-bit number.
     #8B, #44, #24, #04,        -- mov  eax, [esp+4]
     #8A, #4C, #24, #08,        -- mov  cl,  [esp+8]
     #D3, #E0,                  -- shl  eax, cl
     #C2, #08, #00              -- ret  8
   })

but NOT

-- SHIFT_LEFT
constant SHL_CODE = allocate(13)

poke(SHL_CODE, {
     -- First int argument is at stack offset +4, second int is at +8.
     -- Returns a *signed* 32-bit number.
     #8B, #44, #24, #04,
     #8A, #4C, #24, #08,
     #D3, #E0,
     #C2, #08, #00
   })

Regards,
   Juergen