Trap for young (spin) players

BradC

I've just spent an entire day chasing a bug in a bit of spin code.

val := val or $80000000

which should have been

val := val | $80000000

It was in a 32 bit shift register, and I just could not figure out why I always ended up with $FFFFFFFF

<sob sob sob>

....(goes away to read the manual a bit closer)

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Pull my finger!

Phil Pilgrim (PhiPi)

There's also the shorthand version:

  val |= $80000000

-Phil

Ale

I do not know if you resuscitated the "Tricks and Traps" thread, but there are a load of info there with plenty of examples.

BradC

Phil Pilgrim (PhiPi) said...
There's also the shorthand version:

  val |= $80000000

-Phil

Which is precisely what I ended up with after eventually getting it working.
Now the fun part is playing with all the various constructs to minimise the size of the generated spin code.

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Pull my finger!