User's Guide

Example 1
In the following example, the FLOW_DATA environment variable is used to override the flow.data
file name. The profile data is stored instead in /users/profiles/prog.data.
export FLOW_DATA=/users/profiles/prog.data
aCC -c +Oprofile=collect sample.C
aCC -o sample.exe +Oprofile=collect sample.o
sample.exe < input.file1
aCC -o sample.exe +Oprofile=use +O3 sample.C
Example 2
In this example, the +Oprofile=use:filename option is used to override the flow.data file
name with the name /users/profiles/prog.data.
aCC -c +Oprofile=collect +O3 sample.C
aCC -o sample.exe +Oprofile=collect sample.o
sample.exe < input.file1
mv flow.data /users/profile/prog.data
aCC -o sample.exe +Oprofile=use:/users/profiles/prog.data +O3 sample.C
Performing Profile-Based Optimization
To optimize the program based on the previously collected runtime profile statistics, recompile the
program as follows:
aCC -o sample.exe +Oprofile=use +O3 sample.C
For more information on profile-based optimization, refer to the HP-UX Online Linker and Libraries
User’s Guide.
Pragmas That Control Optimization
Compiler options provide a high-level, global approach to optimization. To give you more refinement
in optimization, HP aC++ provides pragma OPT_LEVEL.
See “Optimization Pragmas” (page 103) for more information.
160 Optimizing HP aC++ Programs