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Prefetching textures

Started by neocron Sep 11, 2000 at 1:05 PM 0 replies 400+ views

Original Post

Sep 11, 2000 at 1:05 PM

Hi, I was wondering if there''s a reliable way to mimic the ''prefetch'' asm instruction. I''d like to use prefetch on PII Intel processors to speedup sprite/billboard blitting (in a software renderer). ''prefetch'' is only supported on PIII. Thanks, Karen

mhkrause

Sep 12, 2000 at 7:31 PM

int junk = *SomeDataINeedSometimeLater;

This is because on a modern CPU, prefetch is essentially a load that has no destination register. The above solution is not quite as efficient. Since you never use this data, there is no dependency, so the load can be pending while other stuff is going on. This will work on everything on a PPro on up, and a K6 on up.

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