On Wed, 6 Oct 2004, Dieter [iso-8859-15] Nützel wrote:
Am Mittwoch, 6. Oktober 2004 03:52 schrieb Ian Romanick:Here's a simple patch that gives about a 50% (on my box) speed boost to glReadPixels performance in 24-bit. I measured using the benchmark built into progs/demos/readpix. The interesting thing is that the core MMX & SSE2 routines can be used for other cards as well. For example, it looks like MGA, Unichrome, and others can use the same code for 24-bit.
Stupid question - aren't newer versions of gcc capable of producing SSE/MMX code ? Would it be enough just to turn on appropriate flags ?
best
Vladimir Dergachev
Before persuing this too far, I'd like to look at ways to make the *compiled* code from spantmp.h be more device-independent. That would make it easier to generate a bunch of these generic routines and just plug them in.
You have forgotten 'read_rgba_span_SSE2.S".
What about MMX2, 3DNow, 3DNow2 (pro), SSE (1)?
It would be nice if we have this like MPlayer:
CPU: Advanced Micro Devices Athlon 4 /Athlon MP/XP Palomino 1763 MHz (Family: 6, Stepping: 2) Detected cache-line size is 64 bytes CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0 Compiled with runtime CPU detection - WARNING - this is not optimal!
What do you think?
-Dieter
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