Optimisation logbook

A list of optimisation decisions and their effect on performances.

2011/09/02

• [885] [886] [888] Started importing Ryan Sammartino's PS3 trigonometry library in the core ().
• [890] Do the Taylor series on x / π instead of x: results in a measurable 2% speed increase in sin() (ppu-lv2-g++)
• [891] Do the Taylor series in two steps, for better pipelining at the cost of one extra multiplication: a notable 11% speed increase in sin() (ppu-lv2-g++)