iCall somthing like inline function in fasm.

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Roman

Joined: 21 Apr 2012
Posts: 1762

Roman 25 Jul 2019, 11:22

How about macro iCall ?

Code:

InlineFlag EQU 1 ;yes inline and not call proc.
NoInline   EQU 0 ;no and Call proc

proc Proc1
  mov eax,2 ;this for example because code might be more big ! 100 asm commands
  ret
endp

proc Proc2
  add eax,ebx
  ret
endp

iCall InlineFlag,Proc1
iCall InlineFlag,Proc2
iCall NoInline,Proc1

This generate next code:

Code:

mov eax,2
add  eax,ebx
Call  Proc1

25 Jul 2019, 11:22

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20290
Location: In your JS exploiting you and your system

revolution 25 Jul 2019, 15:59

Inline would generally just be a macro.

Code:

macro do_something { xor eax,eax }

proc do_it
  do_something
  ret
endp

call do_it ;function call
do_something ;inline

25 Jul 2019, 15:59

Roman

Joined: 21 Apr 2012
Posts: 1762

Roman 26 Jul 2019, 06:11

I suggest such:

Code:

macro do_something { xor eax,eax }

proc do_somethingProc
  do_something
  ret
endp

;I do not know whether this macro will work right
macro iCall flg,chMacr {
if flg=1
chMacr
endif
if flg=0
Call chMacr#Proc
endif
}

Use in code:

Code:

inlineFlagProc1 EQU 1
;iCall might call many procs ! One iCall do many macros or Call procs.
iCall inlineFlagProc1,do_something 
iCall inlineFlagProc1,do_something,do_something2,do_something3

Last edited by Roman on 26 Jul 2019, 08:13; edited 3 times in total

26 Jul 2019, 06:11

DimonSoft

Joined: 03 Mar 2010
Posts: 1228
Location: Belarus

DimonSoft 26 Jul 2019, 07:11

So, what’s the purpose? Inlining as one of optimization techniques is not only about putting the procedure body at the call site (although it’s definitely the way to start) but also certain changes at the machine-code level that make such placement efficient: reusing values in registers thus avoiding unnecessary stack/memory accesses, etc. It’s not what can generally be achieved without serious analysis. Just try to write such macro + proc with a few parameters and see how your code gets bloated with useless stuff like moving data between and pushing/popping it (either in caller or callee).

26 Jul 2019, 07:11

Roman

Joined: 21 Apr 2012
Posts: 1762

Roman 26 Jul 2019, 08:04

Quote:

So, what’s the purpose?

If i using many procs i need fast way change Call on code to macro !

Very hard find many procs in differents places of code.

iCall very helpfull.

Only change inlineFlag on null or 1 thats all.

I agree, some times proc optimization is needed and gives short and fast code.

26 Jul 2019, 08:04

DimonSoft

Joined: 03 Mar 2010
Posts: 1228
Location: Belarus

DimonSoft 27 Jul 2019, 08:29

But you gain little to nothing by simply putting procedure body in the caller. The only thing you might gain by blindly copying the body is to remove procedure call overhead but this stuff is quite optimized in hardware these days and, due to speculative execution, the overhead might sometimes even become invisible, so in such cases you would gain larger executable and worse data locality (remember caches and prefetcher). And again, when writing some piece of code in such a way that it is usable as both separate and inlined procedure you might introduce overheads for both cases. Chasing two rabbits usually gets nothing.

27 Jul 2019, 08:29

Roman

Joined: 21 Apr 2012
Posts: 1762

Roman 27 Jul 2019, 08:32

Quote:

Chasing two rabbits usually gets nothing.

Hm !
Rabbits very tasty Smile

When you know how to cook them !

27 Jul 2019, 08:32

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