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[Bug math/15479] ceil, floor and round and trunc raise inexact exception
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 24 May 2016 17:43:09 +0000
- Subject: [Bug math/15479] ceil, floor and round and trunc raise inexact exception
- Auto-submitted: auto-generated
- References: <bug-15479-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=15479
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ac2cc6f021ae4503f1d51c2379d5551a8b05812b
commit ac2cc6f021ae4503f1d51c2379d5551a8b05812b
Author: Joseph Myers <joseph@codesourcery.com>
Date: Tue May 24 17:42:10 2016 +0000
Do not raise "inexact" from generic ceil (bug 15479).
C99 and C11 allow but do not require ceil, floor, round and trunc to
raise the "inexact" exception for noninteger arguments. TS 18661-1
requires that this exception not be raised by these functions. This
aligns them with general IEEE semantics, where "inexact" is only
raised if the final step of rounding the infinite-precision result to
the result type is inexact; for these functions, the
infinite-precision integer result is always representable in the
result type, so "inexact" should never be raised.
The generic implementations of ceil, floor and round functions contain
code to force "inexact" to be raised. This patch removes it for ceil
functions to align them with TS 18661-1 in this regard. Note that
some architecture-specific versions may still raise "inexact", so the
tests are not updated and the bug is not yet fixed.
Tested for x86_64, x86 and mips64.
[BZ #15479]
* sysdeps/ieee754/dbl-64/s_ceil.c: Do not mention "inexact"
exception in comment.
(huge): Remove variable.
(__ceil): Do not force "inexact" exception.
* sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c: Do not mention
"inexact" exception in comment.
(huge): Remove variable.
(__ceil): Do not force "inexact" exception.
* sysdeps/ieee754/flt-32/s_ceilf.c (huge): Remove variable.
(__ceilf): Do not force "inexact" exception.
* sysdeps/ieee754/ldbl-128/s_ceill.c: Do not mention "inexact"
exception in comment.
(huge): Remove variable.
(__ceill): Do not force "inexact" exception.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 18 ++++++++++++++
sysdeps/ieee754/dbl-64/s_ceil.c | 9 +------
sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c | 9 +-----
sysdeps/ieee754/flt-32/s_ceilf.c | 7 +----
sysdeps/ieee754/ldbl-128/s_ceill.c | 35 ++++++++++-----------------
5 files changed, 36 insertions(+), 42 deletions(-)
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