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How does profile guided optimization work?
Profile-guided optimization (PGO) lets you optimize a whole executable file, where the optimizer uses data from test runs of the .exe or . dll file. The data represents the likely performance of the program in a production environment. Profile-guided optimizations are only available for x86 or x64 native targets.
How do you optimize an existing code?
Basic Code Optimizations in C
- Unroll small loops: Most of the times Compiler does this automatically, but it is a good habit of writing optimized codes.
- Avoid calculations in loop: We should avoid any calculation which is more or less constant in value.
What do you need to know about profile guided optimization?
Profile-guided optimization (PGO) lets you optimize a whole executable file, where the optimizer uses data from test runs of the .exe or .dll file. The data represents the likely performance of the program in a production environment. Profile-guided optimizations are only available for x86 or x64 native targets.
Are there any profile guided optimizations for x86?
Profile-guided optimizations are only available for x86 or x64 native targets. Profile-guided optimizations aren’t available for executable files that run on the common language runtime.
When to use virtual call speculation in profile guided optimization?
Virtual Call Speculation – If a virtual call, or other call through a function pointer, frequently targets a certain function, a profile-guided optimization can insert a conditionally executed direct call to the frequently targeted function, and the direct call can be inlined.
How is conditional branch optimization used in profile guided optimization?
Conditional Branch Optimization – With the value probes, profile-guided optimizations can find if a given value in a switch statement is used more often than other values. This value can then be pulled out of the switch statement.