Developer Guide and Reference

Contents

mstringop-strategy, Qstringop-strategy

Lets you override the internal decision heuristic for the particular algorithm used when implementing buffer manipulation functions such as memcpy and memset.

Syntax

Linux and macOS:
-mstringop-strategy
=
alg
Windows:
/Qstringop-strategy
:
alg
Arguments
alg
Specifies the algorithm to use. Possible values are:
const_size_loop
Tells the compiler to expand the string operations into an inline loop when the size is known at compile time and it is not greater than threshold value. Otherwise, the compiler uses its own heuristics to decide how to implement the string operation.
libcall
Tells the compiler to use a library call when implementing string operations.
rep
Tells the compiler to use its own heuristics to decide what form of
rep movs | stos
to use when inlining string operations.
Default
varies
If optimization option
Os
is specified, the default is
rep
. Otherwise, the default is
const_size_loop
.
Description
This option lets you override the internal decision heuristic for the particular algorithm used when implementing buffer manipulation functions such as memcpy and memset.
This option may have no effect on compiler-generated string functions, for example, a call to memcpy generated by the compiler to implement an array copy or structure copy.