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* [Bug math/18370] New: csqrt missing underflows
@ 2015-05-02 20:43 jsm28 at gcc dot gnu.org
2015-08-19 22:43 ` [Bug math/18370] " jsm28 at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2015-05-02 20:43 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18370
Bug ID: 18370
Summary: csqrt missing underflows
Product: glibc
Version: 2.21
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
The csqrt implementations in glibc can miss underflow exceptions when the
result becomes tiny in the course of multiplying by 0.5 (or other scaling down)
and that scaling happens to be exact (but the mathematical result is not
exact). E.g., for float on x86_64:
Failure: Real part of: csqrt_downward (-0x1.08e754p+16 - 0x7.ede03p-120 i):
Exception "Underflow" not set
Failure: Real part of: csqrt_downward (0xb.6554ep+0 + 0x1.247482p-124 i):
Exception "Underflow" not set
Failure: Real part of: csqrt_towardzero (0xb.6554ep+0 + 0x1.247482p-124 i):
Exception "Underflow" not set
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* [Bug math/18370] csqrt missing underflows
2015-05-02 20:43 [Bug math/18370] New: csqrt missing underflows jsm28 at gcc dot gnu.org
@ 2015-08-19 22:43 ` jsm28 at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2015-08-19 22:43 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18370
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |2.23
--- Comment #2 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 2.23.
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2015-05-02 20:43 [Bug math/18370] New: csqrt missing underflows jsm28 at gcc dot gnu.org
2015-08-19 22:43 ` [Bug math/18370] " jsm28 at gcc dot gnu.org
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