[LAD] Optimisations

Will Godfrey willgodfrey at musically.me.uk
Mon Aug 18 17:11:33 UTC 2014

A long time ago ... in a land far away :)
I did some assembler programming on the Acorn Archimedes (ARM 2/3) and worked
out a series of additions and subtractions that would perform very fast
multiplication of awkward numbers by known amounts.

Is there any point in doing this for C programs, or are modern compilers
sophisticated enough to do such things themselves?

If anyone is interested *7 is:
RSB R1, R0, R0, LSL #3

Will J Godfrey
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.

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