Replace exp2 with exp #25984
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Replace exp2 with exp #25984
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sharadmv
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Jan 20, 2025
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Use the exp2 instruction instead of the exp operation for a 10-20% speedup to the attention kernel.
This change works because of the identity:
e^x = 2^(x * log2(e)).The softmax scale and the log2(e) rescaling are also folded in one multiplication.