[Bug 165970] [libc] [patch] strtonum() optimization
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Sat Aug 23 22:19:09 UTC 2014
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=165970
Jilles Tjoelker <jilles at FreeBSD.org> changed:
What |Removed |Added
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CC| |jilles at FreeBSD.org
--- Comment #8 from Jilles Tjoelker <jilles at FreeBSD.org> ---
To keep libc.so size and rtld work down, it would be better to eliminate the ev
array and set a pair of variables instead of 'error'. The compiler will merge
the two copies of the string literal "invalid" (the C standard does not require
this, but gcc and clang have done this for many years).
Rationale: rtld must fix up any pointer inside libc's data segment for the load
address, which adds a relocation entry of several words and increases the
amount of written memory in every process (including processes that do not use
strtonum() at all). Referring to a string constant in code does not have this
issue.
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