libm -fno-builtin
Wilco Dijkstra
Wilco.Dijkstra@arm.com
Fri Aug 17 14:11:00 GMT 2018
Hi,
Yes -fno-builtin should not be used indeed as it disables lots of useful optimizations.
Removing -fno-builtin should have no negative effects except for eg. memcpy where
compilers can recognize an overly simplistic implementation and optimize it to a
call to memcpy... I think you will need a -fno-builtin-memcpy when building the size
optimized version of libc/string/memcpy.c given it is marked with restrict.
I think a config option is overkill.
Wilco
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