Profile Guided Optimizations

And other optimizations details Shachar Shemesh Lingnu Open Source Consulting Ltd.

http://lingnu.com

Credits and LicenseThis lecture is free to use under the Creative Commons Attribution Share Alike license (cc-bysa)Please give credit to Shachar Shemesh and a link to http://www.lingnu.com

All syntax highlighting curtsy of enscript.http://www.iki.fi/~mtr/genscript/

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An Apology to People at HomeThis lecture makes extensive use of "objdump" to view the compilation results' assembly code. There is no sane way to capture that short of taking videos. If you are reading the slides not during the lecture my apology.

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OptimizationOptimization minimizing or maximizing a certain program attribute (wikipedia)Run time, memory usage, power consumption etc.

A crucial part in allowing production of readable code.

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Platform Independent Optimizations

Optimizations that are independent of the platform the program is compiled for

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example1.1.cpp

One Program Unoptimized#include int main( int argc, char *argv[] ) { int i; double f; for( i=1; i