Re: WANTED: Rating of common optimization routines.

> Beyond that, optimizations often become interrelated in many
> compilers. For instance, some optimizers will perform strength
> reduction in a way that relies on copy propagation and dead code
> elimination to "clean up" afterwards. That makes it hard to tell how
> much the optimizations contribute individually.


Or they can interfere with each other. Two different packings of
registers might be equally good by themselves, but one of them may
enable instruction scheduling to do wonderful things and the other may
cause so many write-after-read dependencies that instruction
scheduling is useless.
--
Jeffrey Glen Jackson
jgj@ssd.csd.harris.com
x5483
--

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