Changes between Initial Version and Version 1 of dev/optim/logbook


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Timestamp:
Sep 2, 2011, 11:45:20 AM (8 years ago)
Author:
sam
Comment:

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  • dev/optim/logbook

    v1 v1  
     1= Optimisation logbook =
     2
     3A list of optimisation decisions and their effect on performances.
     4
     5== 2011/09/02 ==
     6
     7Started importing Ryan Sammartino's PS3 trigonometry library in the core ([885] [886] and [888]).
     8
     9 * do the Taylor series on `x / π` instead of `x` ([890]): results in a measurable 2% speed increase in `sin()` (ppu-lv2-g++)
     10 * do the Taylor series in two steps, for better pipelining at the cost of one extra multiplication: