Ways to Improve Performance

Profile-Based Optimization

$ cc +I +O3

-c file.c

Create I-SOM for instrumentation.

$ cc +I +O3

file.o

Link with instrumentation.

$ a.out < input_file

Run instrumented executable with representative input

data.

 

 

$ cc +P +O3

file.o

Perform PBO and HLO.

Replace +O3 with +O4 in the above example to get HLO over the entire program and ADDIL elimination. (You may see a warning when using +O4 at instrumentation indicating that the +O4 option is being ignored. You can ignore this warning.)

I-SOM File Restrictions

For the most part, there are not many noticeable differences between I-SOM files and ordinary object files. Exceptions are noted below.

ld . Linking object files compiled with the +I or +P option takes much longer than linking ordinary object files. This is because in addition to the work that the linker already does, the code generator must be run on the intermediate code in the I-SOM files. On the other hand, the time to compile a file with +I or +P is relatively fast since code generation is delayed until link time.

All options to ld should work normally with I-SOM files with the following exceptions:

-r

The -roption works with both -Iand -P. However, it

 

produces an object file, not an I-SOM file. In 64-bit

 

mode, use -I, -P, or the +nosectionmerge option on

 

a -rlinker command to allow procedures to be

 

positioned independently. Without these options, a -r

 

link merges procedures into a single section.

-s

Do not use this option with -I. However, there is no

 

problem using this option with -P.

-G

Do not use this option with -I. There is no problem

 

using this option with -P.

-A

Do not use this option with -Ior -P.

-N

Do not use this option with -Ior -P.

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HP 9000 specifications

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