In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

Although I can't seem to find if it is spelled out in the docs, it appears that all the built-in math is setup for unsigned use.  Does anyone already have any routines already coded in SX/B to simulate some of the signed math operations?  I am sure I can come up with some but if the code has already been posted it may save some time.

At the moment I have to work with some word variables and need to get some really simple things from them.  So far my code will assume anything with bit 15 set is a negative number in 2's complement format.

From the two word values i'd like to get:

- ABS difference of the two words

- Whether that difference was positive or negative.

Also looking for the best method of handling signed numbers for conditional IF statements.  I had been checking bit 15 to see if it was a negative number first but want to see what others are using.

Robert

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