https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99789
Bug ID: 99789
Summary: std::span or std::string_view are not zero-overhead on
MS abi
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: unlvsur at live dot com
Target Milestone: ---
The issue is that on Microsoft abi, any trivially copyable type whose size is
not 1,2,4,8 bytes will be passed by pointer instead of value.
The empty object will also waste one precious register even it does nothing.
That means std::span, std::string_view etc incur extremely large overhead.
