Homework #5, Question #2

[William R. Lorenz]

Homework #5 question #2 asks us to write assembly code that will "set
bits m:n in %r9 to 1." I did this in about 30 lines of code, but I have
to wonder if there's a more efficient way to do this? Has anyone done
this in just a few lines of code? Am I missing something obvious? :)

[B A Bair]

There are about three different solutions, none of which take more than
eight lines of SPARC code.

You might find it helpful to review the slides about bit manipulation.

;-)

Homework #5 question #2 asks us to write assembly code that will "set bits
m:n in %r9 to 1." I did this in about 30 lines of code, but I have to
wonder if there's a more efficient way to do this? Has anyone done this
in just a few lines of code? Am I missing something obvious? :)

[Grant]

I tried to to it using loops, and breached the "8-line limit."
So, I don't think we're supposed to use loops to do this.

Grant

Post by B A Bair
There are about three different solutions, none of which take more than
eight lines of SPARC code.
You might find it helpful to review the slides about bit manipulation.

[IV]

Post by Grant
I tried to to it using loops, and breached the "8-line limit."
So, I don't think we're supposed to use loops to do this.

If you don't put labels on their own lines, you can do it in seven
with a single loop.