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 ?
My original version used the MMX and SSE intrinsics in GCC 3.4.1. The MMX code it generated was 5 times *slower* than the vanilla C version, and the SSE version caused an internal compiler error. At this point, I don't have a lot of faith in the SIMD intrinsics in current versions of GCC. I fully expect that it will improve, but for now it is unusable. :(
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