[sdcc-devel] [ sdcc-Bugs-1469991 ] Compiled Code

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Bugs item #1469991, was opened at 2006-04-13 11:13
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: msc51(8051) target
Group: unreproducable
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Compiled Code

Initial Comment:
SDCC --version
SDCC : 
mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/d
s400/hc08 2.5.5 #1232 (Mar 29 2006) (MINGW32)

I have a simple file setup that looks like this:

#include <string.h>
#include "SDCCTEST.h"

char str[6] = "MAXIM";
bit flag;

xdata long lTest1;
xdata long lTest2;
xdata long lTest3;

void main(void){
		flag = 0;
		lTest1 = Num1 + Num2;
		lTest2 = Num2 + Num3;
		lTest3 = ((lTest1 + lTest2) / 2); 
		flag = 1;
	while(1); // program loop
}

In SDCCTEST.h I have three #defines:

#define Num1 0x11111111
#define Num2 0x22222222
#define Num3 0x33333333

If you do the addition on a calculator you get:

lTest1 = Num1 + Num2;
0x11111111 + 0x22222222 = 0x33333333
lTest2 = Num2 + Num3;
0x22222222 + 0x33333333 = 0x55555555
lTest3 = ((lTest1 + lTest2) / 2); 
(0x33333333 + 0x55555555 / 2)
 0x88888888 / 2 = 0x44444444
 Here is what gets output into the *.asm file

;SDCCTEST.c:16: lTest3 = ((lTest1 + lTest2) / 2); 
;     genAssign
	mov	dptr,#_lTest3
	mov	a,#0x44
	movx	@dptr,a
	inc	dptr
;	Peephole 101	removed redundant mov
	movx	@dptr,a
	inc	dptr
	mov	a,#0x44
	movx	@dptr,a
	inc	dptr
	mov	a,#0xC4
	movx	@dptr,a

In the second to last line why wouldn't that line be 
#0x44 instead of #0xC4????? 

I am thinking wrong or what???

You can email me @
bkm...@jl...

Thanks










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