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* [Bug math/15214] New: cacos, casin, and casinh wrongly underflow ldbl-128ibm
@ 2013-02-28 19:34 azanella at linux dot vnet.ibm.com
2013-02-28 19:37 ` [Bug math/15214] " azanella at linux dot vnet.ibm.com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: azanella at linux dot vnet.ibm.com @ 2013-02-28 19:34 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15214
Bug #: 15214
Summary: cacos, casin, and casinh wrongly underflow ldbl-128ibm
Product: glibc
Version: 2.17
Status: NEW
Severity: minor
Priority: P2
Component: math
AssignedTo: unassigned@sourceware.org
ReportedBy: azanella@linux.vnet.ibm.com
Classification: Unclassified
The following math/libm-test.inc tests trigger spurious underflows exceptions
for ldbl-128ibm:
cacos (0x1p500 + 1.0 i)
cacos (0x1p500 - 1.0 i)
cacos (-0x1p500 + 1.0 i)
cacos (-0x1p500 - 1.0 i)
cacos (1.0 + 0x1p500 i)
cacos (-1.0 + 0x1p500 i)
cacos (1.0 - 0x1p500 i)
cacos (-1.0 - 0x1p500 i)
casin (0x1p500 + 1.0 i)
casin (0x1p500 - 1.0 i)
casin (-0x1p500 + 1.0 i)
casin (-0x1p500 - 1.0 i)
casin (1.0 + 0x1p500 i)
casin (-1.0 + 0x1p500 i)
casin (1.0 - 0x1p500 i)
casin (-1.0 - 0x1p500 i)
casinh (0x1p500 + 1.0 i)
casinh (0x1p500 - 1.0 i)
casinh (-0x1p500 + 1.0 i)
casinh (-0x1p500 - 1.0 i)
casinh (1.0 + 0x1p500 i)
casinh (-1.0 + 0x1p500 i)
casinh (1.0 - 0x1p500 i)
casinh (-1.0 - 0x1p500 i)
This is in fact an issue with __ieee754_logl implementation: in the domain
reduction phase, where the algorithm transform log(u) -> log(t) + log(u/t) and
log(u/t) -> log(1+(u-t)/t), if the input is high enough the calculation
'1+(u-t)/t' might generate subnormal numbers.
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* [Bug math/15214] cacos, casin, and casinh wrongly underflow ldbl-128ibm
2013-02-28 19:34 [Bug math/15214] New: cacos, casin, and casinh wrongly underflow ldbl-128ibm azanella at linux dot vnet.ibm.com
@ 2013-02-28 19:37 ` azanella at linux dot vnet.ibm.com
2013-03-28 13:00 ` azanella at linux dot vnet.ibm.com
2014-06-13 18:46 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: azanella at linux dot vnet.ibm.com @ 2013-02-28 19:37 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15214
Adhemerval Zanella Netto <azanella at linux dot vnet.ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |azanella at linux dot
| |vnet.ibm.com
AssignedTo|unassigned at sourceware |azanella at linux dot
|dot org |vnet.ibm.com
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* [Bug math/15214] cacos, casin, and casinh wrongly underflow ldbl-128ibm
2013-02-28 19:34 [Bug math/15214] New: cacos, casin, and casinh wrongly underflow ldbl-128ibm azanella at linux dot vnet.ibm.com
2013-02-28 19:37 ` [Bug math/15214] " azanella at linux dot vnet.ibm.com
@ 2013-03-28 13:00 ` azanella at linux dot vnet.ibm.com
2014-06-13 18:46 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: azanella at linux dot vnet.ibm.com @ 2013-03-28 13:00 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=15214
Adhemerval Zanella Netto <azanella at linux dot vnet.ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #1 from Adhemerval Zanella Netto <azanella at linux dot vnet.ibm.com> 2013-03-28 13:00:18 UTC ---
Fixed with commit fbbe2b9a1f04c00ea0f8820a545bd4ca780ffa30.
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* [Bug math/15214] cacos, casin, and casinh wrongly underflow ldbl-128ibm
2013-02-28 19:34 [Bug math/15214] New: cacos, casin, and casinh wrongly underflow ldbl-128ibm azanella at linux dot vnet.ibm.com
2013-02-28 19:37 ` [Bug math/15214] " azanella at linux dot vnet.ibm.com
2013-03-28 13:00 ` azanella at linux dot vnet.ibm.com
@ 2014-06-13 18:46 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-13 18:46 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=15214
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-13 18:46 UTC | newest]
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2013-02-28 19:34 [Bug math/15214] New: cacos, casin, and casinh wrongly underflow ldbl-128ibm azanella at linux dot vnet.ibm.com
2013-02-28 19:37 ` [Bug math/15214] " azanella at linux dot vnet.ibm.com
2013-03-28 13:00 ` azanella at linux dot vnet.ibm.com
2014-06-13 18:46 ` fweimer at redhat dot com
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