Code Profiling Utilities Manual

Code Profiling Usage Scenarios

HP Code Profiling Utilities Manual—542684-003

9-3

Profile-Guided Optimization Example

compiler to generate more efficient code (for example, by using the NO_EXCEPTIONS

compiler option).

Profile-guided optimization is typically used as an additional step in the process shown

in the preceding figure. Once the program has compiled and run at optimization level 2,

follow the steps shown in Figure 9-2 to use profile-guided optimization to produce even

more efficient object code.

Figure 9-2. Profile-Guided Optimization Steps

Recompile with the

profgen option

Run program on

representative

workload to create

raw data file

Use profmrg to

combine raw data files

into DPI file

vst034.vsd

Source program

(compiled and

executed at opt 2)

Measure the

program's

performance

Recompile with

profuse option using

DPI file, and retest

Does program

contain errors?

Debug program

Yes