https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105810
Bug ID: 105810
Summary: __glibcxx_assert can be improved greatly.
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: unlvsur at live dot com
Target Milestone: ---
Every function call has to carry the call which adds a burden. With -Os the
function does not even get expanded. The operator[] becomes extremely
expensive.
https://godbolt.org/z/Gcchdrdxj
The situation might get worse when compiling with -fPIC since load/store data
from %rip register needs more instructions.
It can be improved to something like this. Put all the file, line, and
condition information into a separate function. Since the function is an inline
function, the entire program only holds one copy of the debugging information.
https://godbolt.org/z/xc8jnqh5r
https://godbolt.org/z/85M1PE9Te
vs
https://godbolt.org/z/6fsGo41bj
Unfortunately, GCC got ICE. I have submitted the bug report to fix that.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105809
