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[Bug math/18019] New: [ldbl-128ibm] acoshl inaccurate
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 24 Feb 2015 23:22:44 +0000
- Subject: [Bug math/18019] New: [ldbl-128ibm] acoshl inaccurate
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=18019
Bug ID: 18019
Summary: [ldbl-128ibm] acoshl inaccurate
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
The ldbl-128ibm implementation of acoshl uses a cut-off of 0x1p28 to determine
when to use log(x) + log(2) as a formula. That cut-off is too small for this
format, resulting in large errors, e.g.:
Failure: Test: acosh (0x1p+28)
Result:
is: 2.01012682362384139731e+01 0x1.419ecb712c480c875dedp+4
should be: 2.01012682362384139696e+01 0x1.419ecb712c480c835dedp+4
difference: 3.46944695195361418882e-18 0x1.00000000000000000000p-58
ulp : 8796093022208.0000
max.ulp : 1.0000
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