libstdc++-v3/include/std/string_view · 91ae46853858a2aa4eb8640ce1a72124679a3909 · COBOLworx / gcc-cobol

10 months ago

libstdc++: Optimize std::basic_string_view::starts_with · 482f97e7

Jonathan Wakely authored 10 months ago

We get smaller code at all optimization levels by not creating a
temporary object, just comparing lengths first and then using
traits_type::compare. This does less work than calling substr then
operator==.

libstdc++-v3/ChangeLog:

	* include/std/string_view (starts_with(basic_string_view)):
	Compare lengths first and then call traits_type::compare
	directly.

482f97e7

History

libstdc++: Optimize std::basic_string_view::starts_with

Jonathan Wakely authored 10 months ago

We get smaller code at all optimization levels by not creating a
temporary object, just comparing lengths first and then using
traits_type::compare. This does less work than calling substr then
operator==.

libstdc++-v3/ChangeLog:

	* include/std/string_view (starts_with(basic_string_view)):
	Compare lengths first and then call traits_type::compare
	directly.