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- Subject: Re: bit.lshift and performance - luabitop v.s. lua-5.2.0-work4
- From: David Kastrup <dak@...>
- Date: Wed, 13 Oct 2010 15:33:52 +0200
KHMan <keinhong@gmail.com> writes:
> Anyway most app developers do not need to code DCTs and FFTs
> nowadays.
I find that C compilers tend to be actually astonishingly bad at that.
Coding the inner loops in assembly language can often halve the
execution time. Somehow the optimizers/register allocators don't seem
to like complex butterflies all too well.
--
David Kastrup
