Optimizer Report Generation

The Intel® C++ Compiler provides options to generate and manage optimization reports:

-opt_report generates an optimization report and directs it to stderr. By default, the compiler does not generate optimization reports.
-opt_report_filefilename generates an optimization report and directs it to a file specified in filename.
-opt_report_level{min|med|max} specifies the detail level of the optimization report. The min argument provides the minimal summary and max produces the full report. The default is -opt_report_levelmin.
-opt_report_routinefileroutine_substring generates reports from all routines with names containing the substring as part of their name. If not specified, reports from all routines are generated. By default, the compiler generates reports for all routines.

Specifying Optimizations to Generate Reports

The compiler can generate reports for an optimizer you specify in the phase argument of the -opt_report_phasephase option. The option can be used multiple times on the same command line to generate reports for multiple optimizers. Currently, the following optimizer reports are supported.

Optimizer Logical Name	Optimizer Full Name
ipo	Interprocedural Optimizer
hlo	High Level Optimizer
ilo	Intermediate Language Scalar Optimizer
ecg	Code Generator
omp	Open MP
all	All phases

When one of the above logical names for optimizers is specified, all reports from that optimizer are generated.

For example, -opt_report_phaseipo -opt_report_phaseecg generates reports from the interprocedural optimizer and the code generator.

Each of the optimizers can potentially have specific optimizations within them. Each of these optimizations are prefixed with one of the optimizer logical names. For example:

Optimizer_optimization	Full Name
ipo_inline	Interprocedural Optimizer, inline expansion of functions
ipo_constant_propagation	Interprocedural Optimizer, constant propagation
ipo_function_reorder	Interprocedural Optimizer, function reorder
ilo_constant_propagation	Intermediate Language Scalar Optimizer, constant propagation
ilo_copy_propagation	Intermediate Language Scalar Optimizer, copy propagation
ecg_software_pipelining	Code Generator, software pipelining

All optimization reports that have a matching prefix with the specified optimizer are generated. For example, if -opt_report_phase ilo_co is specified, a report from both the constant propagation and the copy propagation are generated.

The Availability of Report Generation

The -opt_report_help option lists the logical names of optimizers available for report generation.