[Sdcc-user] Complement-ing bit ( winbin: SDCC221 vs. SDCC222 )

[M. F. F. <m_f...@ho...>]

Hi all,
I hope my posting this time is usefull... and I need you to give me
tips/hints on how to compile C source code that use bit variables to get the
most size efficient machine code.

This is part of code I tried to compile using SDCC Winbin V221 and V222,
using same command line:
sdcc -I c:\sdcc\share\include -L c:\sdcc\share\lib\small --code-loc 0xC000
tester.c

#....
#define VSEL P3_2
#....

bit bVSEL,...;

void main ( void ) {
    ....
    bVSEL = ~bVSEL;
    VSEL = bVSEL;
    status_bit();
    ....
}

... and look at the asm result:

===============
with V221..............

; tester.c 329
; Peephole 167   removed redundant bit moves (c not set to _bVSEL)
 cpl  _bVSEL
; tester.c 330
 mov c,_bVSEL
 mov _P3_2,c
; tester.c 331
 lcall _status_bit
00101$:
 C$tester.c$332$1$1 ==.
 XG$toggle_vpp$0$0 ==.
 ret

===============
with V222..............

; tester.c 329
 clr a
 mov c,_bVSEL
 rlc a
 cpl a
; Peephole 105   removed redundant mov
 mov  r2,a
 clr c
 jz 00103$
 cpl c
00103$:
 mov _bVSEL,c
; tester.c 330
 mov c,_bVSEL
 mov _P3_2,c
; tester.c 331
 lcall _status_bit
00101$:
 ret


And for those reasons, I am STILL going to use my old SDCC V221 Winbin... :(
though I really wanted to switch to newer version badly...

kind regards,
Fahmy