Visible to Intel only — GUID: GUID-FEF23B3B-D0F6-484F-8DC5-9AB1315A6431
Visible to Intel only — GUID: GUID-FEF23B3B-D0F6-484F-8DC5-9AB1315A6431
ipo, Qipo
Enables interprocedural optimization between files.
Syntax
Linux: |
-ipo -ipo[n] (ifort only) -no-ipo |
macOS: |
-ipo[n] -no-ipo |
Windows: |
/Qipo /Qipo[n] (ifort only) /Qipo- |
Arguments
ifx: |
None |
ifort: n |
Is an optional integer that specifies the number of object files the compiler should create. The integer must be greater than or equal to 0. |
Default
-no-ipo or /Qipo- |
Multifile interprocedural optimization is not enabled. |
Description
This option enables interprocedural optimization between files. This is also called multifile interprocedural optimization (multifile IPO) or Whole Program Optimization (WPO).
ifx:
When you specify this option, the compiler performs inline function expansion and other interprocedural optimizations for calls to functions defined in separate files. It then creates one object file.
ifort:
If you do not specify n, the default is 0. Otherwise:
If n is 0, the compiler decides whether to create one or more object files based on an estimate of the size of the application. It generates one object file for small applications, and two or more object files for large applications.
If n is greater than 0, the compiler generates n object files, unless n exceeds the number of source files (m), in which case the compiler generates only m object files.
Linux
On ifx, option-ipo automatically sets option -flto.
Windows
On ifx, option/Qipo automatically sets option -fuse-ld=lld.
On ifx, when you specify option [Q]ipo with option [q or Q]opt-report, an optimization report will be generated during the compilation step for each of the files that are compiled, and for the link time compilation. Files generated during the compilation step are named <file-name>.optrpt. The file generated during the link step is called ipo_out.optprt.
On ifort, when you specify option [Q]ipo with option [q or Q]opt-report, an optimization report will be generated at link time. After linking, you will see a report named ipo_out.optrpt in the folder where you linked all of the object files.
This option only applies to host compilation. When offloading is enabled, it does not impact device-specific compilation. Offloading can only be enabled when using ifx.
IDE Equivalent
Visual Studio: Optimization > Interprocedural Optimization
General > Whole Program Optimization
Alternate Options
None