Date: Mon, 19 Aug 2002 11:18:19 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Mikhail Teterin <mi+mx@aldan.algebra.com> Cc: Matthew Seaman <m.seaman@infracaninophile.co.uk>, questions@FreeBSD.ORG Subject: Re: pow(3) on FreeBSD Message-ID: <20020819161819.GB70455@dan.emsphone.com> In-Reply-To: <200208191124.35129.mi%2Bmx@aldan.algebra.com> References: <200208190413.g7J4DEcw051123@corbulon.video-collage.com> <20020819043012.GN74231@dan.emsphone.com> <200208191124.35129.mi%2Bmx@aldan.algebra.com>
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In the last episode (Aug 19), Mikhail Teterin said:
> You are right, the FreeBSD's man-page does not specify the return value
> in case of a non-integer y. I just know it from experiment to be zero
> (and not NaN as Matthew claimed).
>
> = $ cat > test.c
> = #include <math.h>
> = #include <stdio.h>
> = main()
> = {
> = printf("%f\n", pow(2, 1.5));
> = }
> = ^D
> = $ gcc test.c -lm
> = $ ./a.out
> = 2.828427
>
> The test above was, obviously, done on Solaris. On FreeBSD, this same
> program outputs zero:
>
> mteterin@misha:~ (257) uname -a
> FreeBSD misha 5.0-CURRENT FreeBSD 5.0-CURRENT #0: Wed Jul 31 13:27:39 EDT
> 2002 mteterin@misha [...]
> mteterin@misha:~ (258) ./a.out
> 0.000000
There must be something wrong with your setup, then :) It prints
2.828427 on my -current box and all my 4.* boxes as well. Try
rebuilding libc and libm with CFLAGS=-O and nothing else. You may have
hit a compiler bug.
FreeBSD dan.emsphone.com 5.0-CURRENT FreeBSD 5.0-CURRENT #181: Thu Jul 25 14:15:12 CDT 2002 zsh@dan.emsphone.com:/usr/src/sys/i386/compile/DANSMP i386
--
Dan Nelson
dnelson@allantgroup.com
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