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fragment program efficiency w & w/o tex instruction



Hi list,

I experience a strange behaviour with ARB_fragment_program on a Radeon 9800...

My program is around 30 instructions long. It took twice the time to execute this program if there is no texture instruction inside.
If I add a neutral texture instruction (no indirection, and the result of the instruction is not use by the subsequent ALU instructions), the program is appreciably faster...


Is anybody else experience such kind of problem with fp ?
Anybody from ATI around want to comment on this ?

Thanks
Cyril.

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Cyril Kardassevitch


iLuaC software
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