A fix is available
APAR status
Closed as program error.
Error description
A preformance drop is observed when compiling programs with -q64 and -O2 (or higher) that contain loops with integer counters.
Local fix
Compile with -q32 instead of -q64.
Problem summary
PROBLEM DESCRIPTION: Poor performance for loops with 32-bit int control variables with -q64 at -O2 and up. USERS AFFECTED: Users with programs with for/do loops controlled by 32-bit integer variables concerned with performance.
Problem conclusion
Fixed bug inhibiting loop optimization for loops with 32-bit integer control variables with -q64.
Temporary fix
Comments
APAR Information
APAR number
LI75954
Reported component name
XL C/C++ SLES10
Reported component ID
5724S7300
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-02-23
Closed date
2011-02-23
Last modified date
2011-02-23
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
XL C/C++ SLES10
Fixed component ID
5724S7300
Applicable component levels
R900 PSN IZ87268
UP06/09/13
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSJT9L","label":"XL C\/C++"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
14 October 2021