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Date:      Fri, 15 May 1998 01:35:26 -0400 (EDT)
From:      Luoqi Chen <luoqi@chen.ml.org>
To:        hackers@FreeBSD.ORG
Subject:   Why is expm1() not implemented using f2xm1 i387 instruction?
Message-ID:  <199805150535.BAA05452@chen.ml.org>

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I am working on a number crunching program which makes numerous calls to
expm1(). I checked its implementation in msun, I was surprised that
it's not implemented with the f2xm1 i387 instruction, yet exp() is.
I wonder if there is any reason why the C implementation is preferred over
the FPU instruction?

-lq

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