Another effect is that some errors are avoided (and perhaps other changes with how NaN & Inf are treated):
julia> @fastmath (-1.5)^0.5
NaN
julia> @fastmath log(-1.5)
NaN
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Another effect is that some errors are avoided (and perhaps other changes with how NaN & Inf are treated):
julia> @fastmath (-1.5)^0.5
NaN
julia> @fastmath log(-1.5)
NaN