This is the mail archive of the glibc-bugs@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[Bug libc/16706] New: [powerpc] optimized nearbyintl implementation for powerpc64 return wrong results


https://sourceware.org/bugzilla/show_bug.cgi?id=16706

            Bug ID: 16706
           Summary: [powerpc] optimized nearbyintl implementation for
                    powerpc64 return wrong results
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: azanella at linux dot vnet.ibm.com
                CC: drepper.fsp at gmail dot com

Similar to BZ#16414 and BZ#16701, the optimized nearbyintl implementation shows
some wrong results depending on the input. Also Checking on implementation
comments and history, I am very confident the assembly implementation was based
on a version before commit 5c68d401698a58cf7da150d9cce769fa6679ba5f that fixes
BZ#2423 (Errors in long double (ldbl-128ibm) rounding functions in glibc-2.4),
since the implementation indeed does not handle some inputs correctly.

Some input that result in wrong values are:

34503599627370498.515625
1192568192774434123539907640624.484375
-34503599627370498.515625
-1192568192774434123539907640624.484375

A straightforward fix is just remove the wrong optimized implementation.

-- 
You are receiving this mail because:
You are on the CC list for the bug.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]