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As the title, I’m finding vector/matrix library in C optimized for iPhone/iPod processors.
Or just generally fast.
—(edit)—
I’m sorry for unclear question.
I’m looking for fast lib for commercial games for iPhone/iPod. So GPL lib cannot be used.
However, I’ll stop finding fastest lib, it maybe meaningless.
Now(2010.06.26) Accelerate framework included on iOS4, so vDSP/BLAS functions are available.
This utilizes hardware feature (CPU or SIMD) to accelerate floating point operations, so superior speed (2~4.5x average, 8x maximum) and less energy(0.25x maximum) consuming can be gained by using this.
Thanks people for other answers.