Inline assembler

[Semen Matusovski]

Guys --
Subroutine / functions includes ASM only
1) Should I save common registers ?
2) If yes, can I use simple PUSHA ... POPA ?

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E-MAIL: [email protected]

[Steve Hutchesson]

Semen,

The general rule is based on the convention used by Microsoft for 32 bit
windows, if you use EBX, ESI or EDI they must be preserved but PowerBASIC
automatically preserves these 3 registers anyway so there is no need.

PUSHAD and POPAD are handy while debugging or developing code but you are
wasting processor cycles using then as they push more than you generally
need.

If you write a function fully in inline asm, just include #REGISTER NONE
if you are using any local variables so that you do not get register conflicts
with locals.

Regards,

[email protected]

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