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[Bug math/16770] scalb spurious "invalid" exceptions
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Sat, 29 Mar 2014 17:23:13 +0000
- Subject: [Bug math/16770] scalb spurious "invalid" exceptions
- Auto-submitted: auto-generated
- References: <bug-16770-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=16770
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ea6029b19c6004c69a9074bf399091bbfbf58a0c
commit ea6029b19c6004c69a9074bf399091bbfbf58a0c
Author: Joseph Myers <joseph@codesourcery.com>
Date: Sat Mar 29 17:22:14 2014 +0000
Fix scalb spurious "invalid" exceptions (bug 16770).
This patch fixes bug 16770, spurious "invalid" exceptions from scalb
when testing whether the second argument is an integer, by inserting
appropriate range checks to determine whether a cast to int is safe.
(Note that invalid_fn is a function that handles both nonintegers and
large integers, distinguishing them reliably using functions such as
__rint; note also that there are no issues with scalb needing to avoid
spurious "inexact" exceptions - it's an old-POSIX XSI function, not a
standard C function bound to an IEEE 754 operation - although the
return value is still fully determined.)
Tested x86_64 and x86.
[BZ #16770]
* math/e_scalb.c (__ieee754_scalb): Check second argument is not
too large before casting to int.
* math/e_scalbf.c (__ieee754_scalbf): Likewise.
* math/e_scalbl.c (__ieee754_scalbl): Likewise.
* math/libm-test.inc (scalb_test_data): Add more tests.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 9 +++++++++
NEWS | 2 +-
math/e_scalb.c | 2 +-
math/e_scalbf.c | 2 +-
math/e_scalbl.c | 2 +-
math/libm-test.inc | 17 +++++++++++++++++
6 files changed, 30 insertions(+), 4 deletions(-)
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