A fix is available
APAR status
Closed as program error.
Error description
For certain specific sequences of source code, the xlc compiler generates xvcpsgnd instructions instead of the xxlor instruction causing programs to be not as fast as they cab be.
Local fix
N/A
Problem summary
USERS AFFECTED: Those using -qarch/tune=pwr7 and higher; along with -O2 and higher maybe affected by this issue. PROBLEM DESCRIPTION: Less performance for register moves with -qarch/tune=pwr7 and up may be experienced.
Problem conclusion
The compiler has been fixed to improve the instruction selection for vector register moves to improve performance.
Temporary fix
Comments
APAR Information
APAR number
LI78428
Reported component name
XL C/C++ FOR LI
Reported component ID
5725C7300
Reported release
D10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-02-25
Closed date
2015-02-25
Last modified date
2015-02-25
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++ FOR LI
Fixed component ID
5725C7300
Applicable component levels
RD10 PSN IV57389
UP06/09/13
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Document Information
Modified date:
17 October 2021