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Message-ID: <20260612214341.GK3520958@port70.net>
Date: Fri, 12 Jun 2026 23:43:41 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: using builtins within musl
i experimented with using compiler builtins in musl after it was shown
that builtin memcpy allows optimising qsort for various element sizes.
i expected code gen to get more streamlined. for math functions this
mostly works when calls are inlined as single instruction, for string
functions cold and hot code should be handled differently ideally, but
the compiler does not know the hot calls so it can unnecessarily bloat
the code with inlines.
i don't know if this is worth it, attached the patches for the record.
View attachment "0001-string.h-use-builtin-memcpy-and-memset-internally.patch" of type "text/x-diff" (4300 bytes)
View attachment "0002-string.h-use-builtin-memcmp.patch" of type "text/x-diff" (1078 bytes)
View attachment "0003-math.h-use-builtin-fabs-and-sqrt.patch" of type "text/x-diff" (20041 bytes)
View attachment "0004-math.h-use-builtin-copysign.patch" of type "text/x-diff" (3881 bytes)
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