Intruction time in Hitech C

luanktd · Jan 6, 2013

I write a function in hitech c, but i don't know exact intruction time, can you help me.
- what time to execute once intruction in hitech C?

Code C - [expand]
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void delay( char x, char y)
{
do{
z=y;
do{;}while(--Z);
}while(--X);
}
// x=3,y=3. How many seconds this function delay?

bigdogguru · Jan 6, 2013

If the MPLAB IDE is being utilized, you can use the MPLAB Simulator in conjunction with the Stopwatch Tool to measure the execution time of a routine of section of code:

**broken link removed**

**broken link removed**

Of course you can always calculate the duration of execution by counting the instruction cycles required for each of the resulting Assembly Language instructions.

BigDog

luanktd · Jan 7, 2013

Thanks Big dog
i think it compiled to ASM, and follow me

Code:

LOOP DECFSZ COUNT_X,0

Code:

GOTO LOOP1

Code:

RETURN

Code:

LOOP1 DECFSZ COUNTY,0

Code:

GOTO LOOP1

Code:

GOTO LOOP

// AND INTRUCTION:
// DESFSZ: 1 CYCLE
// GOTO : 2 CYCLE
// RETURN: 2 CYCLE
// CALL FUNCTION IN HITECH C : 14 CYCLE
// SO RESULT:: DELAY = [3*(Y-1)+4]*[3*(X-1)+2]+14
// EXAMPLE:X=2,Y=8 ::::::::ELAY = [3*(8-1)+4]*[3*(2-1)+2]+14=139 CYCLE

bigdogguru · Jan 7, 2013

Have you used the Stopwatch feature in MPLAB SIM to verify your calculation?

BigDog

Intruction time in Hitech C

luanktd

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Code C - [expand]
1 2 3 4 5 6 7 8	void delay( char x, char y) { do{ z=y; do{;}while(--Z); }while(--X); } // x=3,y=3. How many seconds this function delay?

Intruction time in Hitech C

luanktd

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bigdogguru

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luanktd

Newbie level 5

bigdogguru

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