[Bug tree-optimization/88702] [8/9/10/11 regression] We do terrible job optimizing IsHTMLWhitespace from Firefox

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88702

--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Liska <marxin@gcc.gnu.org>:

https://gcc.gnu.org/g:c961e94901eb793b1a18d431a1acf7f682eaf04f

commit r11-5642-gc961e94901eb793b1a18d431a1acf7f682eaf04f
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Dec 1 12:18:46 2020 +0100

    if-to-switch: Support chain with 2 BBs.

    As seen in the test-case, even 2 BBs can handle interesting
    cases covered by a jump table or a bit-test.

    gcc/ChangeLog:

            PR tree-optimization/88702
            * gimple-if-to-switch.cc (pass_if_to_switch::execute):
            Require at least 2 BBs.
            * gimple-if-to-switch.cc (find_conditions): Require
            equal precision for low and high of a range.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/88702
            * gcc.dg/tree-ssa/if-to-switch-9.c: New test.