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Altera_Forum's avatar
Altera_Forum
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10 years ago

how many cycles does each command take in nios?

in my project, i make a loop to blink a led: int main(void) { int i=0; for(i=0;i<100;i++) { IOWR_ALTERA_AVALON_PIO_DATA(QD_PIO_0_BASE,0xff); delay(); ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

thanks for your reply.

i am not worried about it, i just want to know how long NIOS instructions take,

this may be helpful.

i read the objdump file, i looks like a assembly language, about the i++, it shows:

void delay(void)

{

alt_u32 i =0;

while(i < 100000)

80031c: e0ffff17 ldw r3,-4(fp)

800320: 008000b4 movhi r2,2

800324: 10a1a7c4 addi r2,r2,-31073

800328: 10fff92e bgeu r2,r3,800310 <__reset+0xff7f8310>

{

i++;

}

}

80032c: e037883a mov sp,fp

800330: df000017 ldw fp,0(sp)

800334: dec00104 addi sp,sp,4

800338: f800283a ret

does each line cost one clock?