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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/105810] New: __glibcxx_assert can be improved greatly.
Date: Wed, 01 Jun 2022 21:31:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105810

            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 da=
ta
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 in=
line
function, the entire program only holds one copy of the debugging informati=
on.
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=3D105809=