math: use portable Exp instead of 387 instructions on 386
The 387 implementation is less accurate and slower. name old time/op new time/op delta Exp-8 29.7ns ± 2% 24.0ns ± 2% -19.08% (p=0.000 n=10+10) This makes Gamma more accurate too. Change-Id: Iad33b9cce0b087ccbce3e08ba7a6d285c4999d02 Reviewed-on: https://go-review.googlesource.com/30230 Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Quentin Smith <quentin@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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