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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/88387] Possible code optimization when right
 shift count >= width of type
Date: Sat, 05 Aug 2023 03:34:03 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 8.2.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: INVALID
X-Bugzilla-Priority: P3
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X-Bugzilla-Target-Milestone: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D88387

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
   Target Milestone|---                         |13.0
             Status|NEW                         |RESOLVED

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Starting in GCC 13 we remove the branch fully and assume n >> 222 is always=
 0.

In ethread:
Checking profitability of path (backwards):  bb:2 (3 insns) bb:0
  Control statement insns: 2
  Overall: 1 insns

 Registering killing_def (path_oracle) _1
Checking profitability of path (backwards):=20
  [1] Registering jump thread: (0, 2) incoming edge;  (2, 4) nocopy;=20
path: 0->2->4 SUCCESS=