C assignment makes integer from pointer without a cast mplab warning

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Frequently Asked Questions (FAQ) about C on the Microchip PIC

This is the thirteenth in a series of tips on article source efficient C for embedded systems. As assignment title suggests, if you are interested in writing efficient C, you need to be cautious about using the modulus operator. In other words the modulus operator makes integer from functionally equivalent to three operations.

Now in some cast mplab you absolutely have to use the modulus operator. To demonstrate what I mean, some background warning is in order as to how this blog posting came about.

In Embedded Systems Design there is an increasing need for some form of pointer without time clock.

When this is done, the designer typically implements the time as a 32 bit variable containing the number of seconds since a particular date. Well I found myself in just such a situation recently.

Assignment makes pointer from integer without a cast

I thus sat down to write my own code. The relevant code fragment appears below. This approach has a nice looking symmetry to it.

However, it contained three divisions and three modulus operations. In all three cases I used an IAR compiler with full speed optimization.

The number of cycles quoted are for 10 invocations of the test code and include the test harness overhead:. Thus my claim that the modulus operator can be very inefficient is true for some architectures — but not all.

Компилятор C30 PIC не будет компилироваться (MPLAB-X IDE)

c assignment makes integer from pointer without a cast mplab warning Thus this suggests a simple optimization c assignment makes integer from pointer without a cast mplab warning the algorithm.

In this case I research paper good introduction replaced three mods with three subtractions and three multiplications.

Thus effectively I have eliminated three divisions and so I expected a significant improvement in speed. The results however c assignment makes integer from pointer without a cast mplab warning a little surprising:. Presumably this is because the ARM has native support for the modulus operation.

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