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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/67014] builtin_tolower is inefficient.
Date: Wed, 18 Aug 2021 12:40:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D67014

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW

--- Comment #3 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
So the macro definition comes from glibc:
ctype/ctype.h

# if __GNUC__ >=3D 2 && defined __OPTIMIZE__ && !defined __cplusplus
#  define tolower(c)    __tobody (c, tolower, *__ctype_tolower_loc (), (c))
#  define toupper(c)    __tobody (c, toupper, *__ctype_toupper_loc (), (c))
# endif /* Optimizing gcc */

That's why the GCC compiler can't map it to a builtin. On the other hand, I
don't see why would it be beneficial in this case?=