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[Bug] Fast-math is enabled by TVM by default #874

@LyricZhao

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@LyricZhao

For example, TVM translates exp into fast-math version by default, ignoring tilelang.PassConfigKey.TL_DISABLE_FAST_MATH.

See https://github.com/apache/tvm/blob/main/src/target/source/intrin_rule_cuda.cc#L172.

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