[Bug tree-optimization/78888] toupper(x) can be assumed not to be in the range 'a' - 'z'

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78888

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andrew Macleod <amacl...@gcc.gnu.org>:

https://gcc.gnu.org/g:1ce0b26e6e1e6c348b1d54f1f462a44df6fe47f5

commit r12-2517-g1ce0b26e6e1e6c348b1d54f1f462a44df6fe47f5
Author: Andrew MacLeod <amacl...@redhat.com>
Date:   Mon Jul 26 09:40:32 2021 -0400

    Adjust ranges for to_upper and to_lower.

    Exclude lower case chars from to_upper and upper case chars from to_lower.

            gcc/
            PR tree-optimization/78888
            * gimple-range-fold.cc (fold_using_range::range_of_builtin_call):
Add cases
            for CFN_BUILT_IN_TOUPPER and CFN_BUILT_IN_TOLOWER.

            gcc/testsuite/
            * gcc.dg/pr78888.c: New.