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Old 08-09-2004, 10:21 AM   #1
Annie0716
LQ Newbie
 
Registered: Jul 2004
Posts: 10

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Unhappy Who can help me to solve this problem?


I am trying to test my asm code, but I met a strange problem. I have two codes, the only one difference between them is the first one caculate two numbers and the later does four. But the results of them are so different. The first one can run, but the second died.

Since I do this in an embedded enviroment, and I lack the debugging experience under it, so could anyone help me on this problem£¿
What is the problem?

Thank you very much!

1st:
__asm__("
move.l #0x00000080, %%MACSR;
move.w #0x00, %%CCR;

move.l %1, %%a0; /*win_cos_l*/
move.l %2, %%a1; /*out*/

/*add.l #2448, %%a0;
add.l #68, %%a1;*/

move.l #18, %%d0; /*counter*/

LOOP_ONE:
move.l #0,%%acc;
move.l %3,%%a2; /*in*/

move.l (%%a0),%%a3; /*1st cycle*/
move.l (%%a2),%%d3;
mac.l %%d3, %%a3;
move.l (4,%%a0),%%a4;
move.l (4,%%a2),%%d4;
mac.l %%d4, %%a4;
/*move.l (8,%%a0),%%a5;
move.l (8,%%a2),%%d5;
mac.l %%d5, %%a5;
move.l (12,%%a0),%%a6;
move.l (12,%%a2),%%d6;
mac.l %%d6, %%a6;*/

move.l %%acc, %%d1;
move.l %%d1, (%%a1);

subi.l #1, %%d0;
bne LOOP_ONE;
"
:"=m" ((out))
:"r" (win_cos_l),"r"(out),"r"(in));

2nd:
__asm__("
move.l #0x00000080, %%MACSR;
move.w #0x00, %%CCR;

move.l %1, %%a0; /*win_cos_l*/
move.l %2, %%a1; /*out*/

/*add.l #2448, %%a0;
add.l #68, %%a1;*/

move.l #18, %%d0; /*counter*/

LOOP_ONE:
move.l #0,%%acc;
move.l %3,%%a2; /*in*/

move.l (%%a0),%%a3; /*1st cycle*/
move.l (%%a2),%%d3;
mac.l %%d3, %%a3;
move.l (4,%%a0),%%a4;
move.l (4,%%a2),%%d4;
mac.l %%d4, %%a4;
move.l (8,%%a0),%%a5;
move.l (8,%%a2),%%d5;
mac.l %%d5, %%a5;
move.l (12,%%a0),%%a6;
move.l (12,%%a2),%%d6;
mac.l %%d6, %%a6;

move.l %%acc, %%d1;
move.l %%d1, (%%a1);

subi.l #1, %%d0;
bne LOOP_ONE;
"
:"=m" ((out))
:"r" (win_cos_l),"r"(out),"r"(in));
 
Old 08-09-2004, 11:03 AM   #2
SciYro
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Registered: Oct 2003
Location: hopefully not here
Distribution: Gentoo
Posts: 2,038

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tho i have no clue what that says, i do must wonder, what asm code is it for (the target CPU) as it appears quite different from what i learned for 8086
 
Old 08-09-2004, 07:59 PM   #3
Annie0716
LQ Newbie
 
Registered: Jul 2004
Posts: 10

Original Poster
Rep: Reputation: 0
It' s for MCF5249, a MOTOROLA MCU. Different syntax from the asm of Intel on 8086.

The instruction mac means multiply and accumulation and 'l' means longword.

Could anyone give me a help on my problem?
 
  


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