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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114301] New: gimple_can_duplicate_bb_p check
 for returns twice can be moved to the check of the last statement
Date: Sun, 10 Mar 2024 22:29:26 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: compile-time-hog, internal-improvement
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114301

            Bug ID: 114301
           Summary: gimple_can_duplicate_bb_p check for returns twice can
                    be moved to the check of the last statement
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog, internal-improvement
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

It is the case that the returns twice function will always be the last
statement of the BB so the check for that can be moved up to the check of t=
he
last statement part. This is a small optimization as gimple_call_flags (whi=
ch
calls flags_from_decl_or_type) can call special_function_p and
special_function_p does string comparisons in the end. So removing as many
calls to gimple_call_flags  can speed up GCC slightly.=