[PD] Pd sounds better than Max?
Robert Scott
lists at humanleg.org.uk
Sun Mar 9 23:37:54 CET 2008
On Sunday 09 March 2008 19:59, Charles Henry wrote:
> Pd for 64-bit processors could potentially redefine t_sample as
> a double, with no loss in performance (with nearly twice as much memory
> usage).
Mmmmmno...
It just so happens that x87s always compute a double, so it makes little
difference there. What you're forgetting is that if you're using SIMD (for
example SSE2) using doubles means you can only fit two samples into a vector
register instead of four. Half the throughput. On top of that, if you check
instruction tables, packed double instructions have a slightly higher latency
than packed singles. For the core2 at least.
Not everything (even 64bit) uses an x87.
robert.
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