Use -Qoption with the applicable keywords to select particular inline expansions and loop optimizations. The option must be entered with a -ip or -ipo specification, as follows:
prompt>icpc -ip -Qoption,tool,opts
where tool is C++ (c) and opts are -Qoption specifiers (see below).
If you specify -ip or -ipo without any -Qoption qualification, the compiler
You can refine interprocedural optimizations by using the following -Qoption specifiers. To have an effect, the -Qoption option must be entered with either -ip or -ipo also specified, as in this example:
prompt>icpc -ip -Qoption,c,ip_specifier
where ip_specifier is one of the specifiers described in the table below:
| Specifer | Description |
|---|---|
| -ip_args_in_regs=0 | Disables the passing of arguments in registers. By default, external functions can pass arguments in registers when called locally. Normally, only static functions can pass arguments in registers, provided the address of the function is not taken and the function does not use a variable number of arguments. |
| -ip_ninl_max_stats=n | Sets the valid max number of intermediate language statements for a function that is expanded in line. The number n is a positive integer. The number of intermediate language statements usually exceeds the actual number of source language statements. The default value for n is 230. The compiler uses a larger limit for user inline functions. |
| -ip_ninl_min_stats=n | Sets the valid min number of intermediate language
statements for a function that is expanded in line. The number n
is a positive integer. The default value for ip_ninl_min_stats
is:
|
| -ip_ninl_max_total_stats=n | Sets the maximum increase in size of a function, measured in intermediate language statements, due to inlining. n is a positive integer whose default value is 2000. |
The following command activates procedural and interprocedural optimizations on source.cpp and sets the maximum increase in the number of intermediate language statements to 5 for each function:
prompt>icpc -ip -Qoption,c,-ip_ninl_max_stats=5 source.cpp