Your message dated Fri, 16 Nov 2007 15:19:18 +0100 with message-id <[EMAIL PROTECTED]> and subject line libc6: hypotf underflows for small inputs has caused the attached Bug report to be marked as done.
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--- Begin Message ---Package: libc6 Version: 2.3.6.ds1-13 Severity: normal The hypotf function in libm produces incorrect results for the code below. Comparing Debian 4 glibc source with current upstream source code shows a change in the constants used for bit fiddling in the function. It should be possible to backport the fix. Current implementation on Debian 4 produces a result of 0 instead of 2.009718e-14. #include <math.h> #include <stdio.h> int main() { float a,b,c; a = -1.81341284e-16; b = 2.00963666e-14; c = hypotf(a,b); printf("result of hypotf(%e,%e) is %e.\n", a, b, c); } -- System Information: Debian Release: 4.0 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.18-4-amd64 Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) Versions of packages libc6 depends on: ii tzdata 2007b-1 Time Zone and Daylight Saving Time libc6 recommends no packages. -- no debconf information
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--- Begin Message ---Version: 2.6-1 On Mon, Oct 29, 2007 at 03:46:31PM -0400, Duncan Po wrote: > Package: libc6 > Version: 2.3.6.ds1-13 > Severity: normal > > The hypotf function in libm produces incorrect results for the code > below. > > Comparing Debian 4 glibc source with current upstream source code shows > a change in the constants used for bit fiddling in the function. It > should be possible to backport the fix. > > Current implementation on Debian 4 produces a result of 0 instead of > 2.009718e-14. > > #include <math.h> > #include <stdio.h> > > int main() { > float a,b,c; > > a = -1.81341284e-16; > b = 2.00963666e-14; > > c = hypotf(a,b); > > printf("result of hypotf(%e,%e) is %e.\n", a, b, c); } > Marking this bug as fixed in glibc 2.6-1. -- .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [EMAIL PROTECTED] | [EMAIL PROTECTED] `- people.debian.org/~aurel32 | www.aurel32.net
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