New and changed features in this HP C++ version A.10.22 are
listed below. They apply to HP-UX 10.x operating systems.
New +DA
designations for PA-RISC 2.0 model and processor numbers--to
generate code for the PA-RISC 2.0 systems. The +DAportable
option generates code compatible across PA-RISC 1.1 and 2.0 workstations
and servers.
Default architecture object code generation is now determined
automatically for all systems as that of the machine on which you
compile.
New +DS designations
for PA-RISC 2.0 model and processor numbers--to perform instruction
scheduling tuned for PA-RISC 2.0 systems.
Default instruction scheduling is now determined automatically
for all systems as that of the machine on which you compile.
New or changed optimization options to enhance performance:
+Odataprefetch
-- to generate data prefetch instructions for data structures referenced
within innermost loops.
+Oentrysched --
changing to make save and restore operations more efficient.
+Ofailsafe -- to
enable fail-safe optimization by default.
When a compilation fails at the current optimization level,
+Ofailsafe will automatically restart
the compilation at a lower level of optimization.
+Ofltacc -- changing
to provide better performance for PA-RISC 2.0 targets.
+Oinlinebudget--to
perform aggressive inlining.
+Oloopunroll --
to enable loop unrolling.
+Ostaticprediction
-- to enable static branch prediction.
New option -l:library
-- to support the ld feature.
New option -ptR
-- to prevent re-instantiation of templates when compiling and linking
from multiple directories and using the same repository, and to
prevent out-of-date errors on secondary
repositories.
New +ESfic option
-- to replace millicode calls with inline code for fast indirect
calls.
New +help option
-- to invoke online help for the HP C+ compiler and linker and libraries.
New -ext option
-- to enable extensions to HP C++ functionality. At this time the
extension included is 64-bit integer data type (long long)
support for HP C++ applications that need to use large integers,
such as large file systems databases.
New option +dup_static_removal
-- to reduce the size of executables and to enhance performance
by removing duplicate inline member functions that were dropped
out of line because they were too complex or too large.
The default, +nodup_static_removal,
does not remove duplicate static member functions. Look up this
option in the C++ Online Programmers Guide
for an example of when to use the default.
New default elimination of duplicate symbolic debug
information -- to reduce the size of object files and executables
and to enhance performance. To prevent the elimination of duplicate
symbolic debug information, use the option +Xd.
This option may be needed if you have pxdb
or xdb problems.
New Explicit Template Instantiation feature -- to
substantially reduce the amount of time required to compile libraries
for which large numbers of templates are instantiated.
Updated HP C++ Troubleshooting Notes
-- to include new information in sections on "Explicit
Template Instantiation," "Directed and Automatic
Instantiation to Generate Needed Templates," and "Directed
Template Instantiation."
To reduce code size, inline functions are no longer
included in debug information. If you want to debug inline functions,
use the +d compiler option.
