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[Bug math/16707] New: [powerpc] optimized round implementation for powerpc64 return wrong results
- From: "azanella at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 14 Mar 2014 13:26:29 +0000
- Subject: [Bug math/16707] New: [powerpc] optimized round implementation for powerpc64 return wrong results
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=16707
Bug ID: 16707
Summary: [powerpc] optimized round implementation for powerpc64
return wrong results
Product: glibc
Version: 2.19
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: azanella at linux dot vnet.ibm.com
Similar to BZ#16414, BZ#16701, and BZ#16706 the optimized round 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.
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