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ads problem

LI JUN
Note: This was originally posted on 26th April 2010 at http://forums.arm.com

code:
void __irq IRQ_Timer(void)
{

[0xe92d503f]   stmfd    r13!,{r0-r5,r12,r14}
    
           if((IO0PIN&U0)&&(T1IR&0x40))  
[0xe59f39ac]   [color="#FF0000"]ldr      r3,0x0000132c ; = #0xe0028000[/color]
[0xe5930000]   [color="#FF0000"]ldr      r0,[r3,#0][/color]
[0xe3100b80]   tst      r0,#0x20000
[0xe59f099c]   ldr      r0,0x00001328 ; = #0x40000004             
[0xe3a0c055]   mov      r12,#0x55
[0xe2431b80]  [color="#FF0000"] sub      r1,r3,#0x20000[/color]
[0x0a000014]   beq      0x9e8  ; (IRQ_Timer + 0x74)
[0xe5912000]   ldr      r2,[r1,#0]
[0xe3120040]   tst      r2,#0x40
[0x0a000011]   beq      0x9e8  ; (IRQ_Timer + 0x74)
  
ram data:
0x00001320  E000C000 E0034000 40000004 [color="#FF0000"]E0028000[/color]
0x00001330  00003092 00002710 40000044 000008D4
0x00001340  4000001C 40000000 00000974 000030A2

i have defined the[color="#FF0000"] T1IR [/color]and [color="#FF0000"]IO0PIN[/color] by macro,but i find the mcu gets the register address from ram , please look at the ram data.and i use the lpc2138.
please help me!
Parents
  • Arm Employee Badge
    Note: This was originally posted on 26th April 2010 at http://forums.arm.com

    There doesn't appear to be anything fundamentally wrong with what the compiler has done;
    optimising for space, this is likely to be the best option.

    It is possible that speed may be improved by generating the address via MOV and ADD,
    are you compiling with -Otime or -Ospace?

    hth
    s.
Reply
  • Arm Employee Badge
    Note: This was originally posted on 26th April 2010 at http://forums.arm.com

    There doesn't appear to be anything fundamentally wrong with what the compiler has done;
    optimising for space, this is likely to be the best option.

    It is possible that speed may be improved by generating the address via MOV and ADD,
    are you compiling with -Otime or -Ospace?

    hth
    s.
Children
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