regcall, Qregcall

Tells the compiler that the __regcall calling convention should be used for functions that do not directly specify a calling convention.

Syntax

Linux OS and OS X:

-regcall

Windows OS:

/Qregcall

Arguments

None

Default

OFF

The __regcall calling convention will only be used if a function explicitly specifies it.

Description

This option tells the compiler that the __regcall calling convention should be used for functions that do not directly specify a calling convention. This calling convention ensures that as many values as possible are passed or returned in registers.

It ensures that __regcall is the default calling convention for functions in the compilation, unless another calling convention is specified in a declaration.

This calling convention is ignored if it is specified for a function with variable arguments.

Note that all __regcall functions must have prototypes.

IDE Equivalent

None

Alternate Options

None

For more complete information about compiler optimizations, see our Optimization Notice.