How about declaring 'i' as volatile??
volatile int i;
for (i=0; i<N; i++)
continue;
Haven't tried this but just maybe...
Regards
-Bill Knight
R O SoftWare
On Fri, 29 Nov 2002 17:00:07 +0300, Dmitry wrote:
>yes...
>this drives me up the wall.
>try:
> for (i=0;i<N;i++) asm("; loop %0" ::"r"(i));
>then gcc will probably not optimize the loop.
>On Friday 29 November 2002 16:55, Steve Underwood wrote:
>> Hi Dmitry,
>>
>> I think this problem is for you.......
>>
>> I have a delay loop for a slow LCD interface. This includes the
>> following routine:
>>
>> static __inline__ void delay_b(void)
>> {
>> int i;
>>
>> for (i = 90; i > 0; i--)
>> __asm__ __volatile__("; loop");
>> }
>>
>>
>> Compiled with the current mspgcc, this is optimsed to nothing. I
>> reported this problem before. It seemed to be fixed a week or two ago,
>> but is now back. A slightly modified routine:
>>
>> static __inline__ void delay_b(void)
>> {
>> int i;
>>
>> for (i = 90; i > 0; i--)
>> _NOP();
>> }
>>
>> produces a single NOP instruction, and there is no reason why it should
>> not. However, if you take away the __inline__ you get something
>> unexpected. You get 30 nop instructions, with a loop around them to
>> repeat them 3 times. This is correct, but not very efficient :-)
>>
>> The above effects are with -O2 optimisation.
>>
>> Regards,
>> Steve
>>
>>
>>
>>
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