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[Bug math/10089] New: rintf() in sysdeps/ieee754/flt-32/s_rintf.c makes wrong rounding of 2097152.75
- From: "kononov at ftml dot net" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 21 Apr 2009 20:42:44 -0000
- Subject: [Bug math/10089] New: rintf() in sysdeps/ieee754/flt-32/s_rintf.c makes wrong rounding of 2097152.75
- Reply-to: sourceware-bugzilla at sourceware dot org
rintf(2097152.75) returns 2097152, which is wrong. It should be 2097153.
2097152.75 = 0x1.000006p+21 = 0b1000000000000000000000.11, which after rounding
should be 0b1000000000000000000001, which is 0x1.000008p+21 = 2097153
The behavior is shown by the __rintf function "ripped" from the glibc-20090420
snapshot.
--
Summary: rintf() in sysdeps/ieee754/flt-32/s_rintf.c makes wrong
rounding of 2097152.75
Product: glibc
Version: unspecified
Status: NEW
Severity: minor
Priority: P2
Component: math
AssignedTo: aj at suse dot de
ReportedBy: kononov at ftml dot net
CC: glibc-bugs at sources dot redhat dot com
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=10089
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