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[CINN] Use approx tanh for fp16/bf16 by lshpku · Pull Request #72871 · PaddlePaddle/Paddle · GitHub
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[CINN] Use approx tanh for fp16/bf16 #72871
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你的PR提交成功，感谢你对开源项目的贡献! |
zyfncg
approved these changes
May 22, 2025
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PR Category
CINN
PR Types
Performance
Description
在fp16/bf16场景使用
tanh.approx.f32汇编替换原有的tanh()函数，可节省30%计算带宽原理：原有的tanh在SASS层面是拆成几条EXP+RCP实现的，新的tanh.approx则就是一条TANH
精度对比：遍历所有float16和bfloat16取值，无任何精度差别，因为中间过程是用float32算的，cast回去就把精度误差都消除了；float32下则最高有2e-6的误差，所以fp32的场景仍然用原来的tanh
另外，CUDA还有
tanh.approx.f16/bf16的版本，省了cast的成本，但是我测了下误差高达5e-4，还是用fp32的版本好了Pcard-85711