8 Feb
2003
8 Feb
'03
8:24 a.m.
On Sat, Feb 08, 2003 at 12:09:59 +0100, David Olofson wrote:
On Friday 07 February 2003 23.07, Steve Harris wrote:
[...]
Cool. Would your average compiler generate that kind of code from
clean if()s, or do you have to go SIMD? (I've only seen this in SIMD
extensions and DSPs before, but I'm not up to date with the "normal"
x86 or PPC instruction sets.)
Its not an instruction its just a bit of maths using fabs().
You might
ove the conditionals around a bit depending on which
case you want to be the fastest, but I don't think it gets much
more fun than that.
The are branchless clamps, which save a few cycles. Any wild ideas are welcome, of course! A bit of
brainstorming never
hurts.
Sure.
[silence detection]
Besides, if you have seriously heavy plugins in
combination with this
"a few effects at a time" behavior, the host could probably optimize
this a bit without plugins explicitly supporting it. It means the
host has to test buffers and figure out a clean way of activating and
deactivating plugins without side effects, but if the plugins, or
whole sub nets of plugins can be disabled, it's still a big win.
...and doesn't require any API support whatsoever, apart from the
(de)activation stuff, which is needed anyway.
You still have unpredicatable CPU load, which makes it pretty useless.
- Steve