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From: "roger at nextmovesoftware dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/17886] variable rotate and unsigned long long rotate
 should be better optimized
Date: Tue, 10 Oct 2023 18:38:53 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 4.0.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: roger at nextmovesoftware dot com
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P2
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Message-ID: <bug-17886-4-SzI8YFvaVm@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D17886

Roger Sayle <roger at nextmovesoftware dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |roger at nextmovesoftware =
dot com
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #27 from Roger Sayle <roger at nextmovesoftware dot com> ---
I believe that this issue has been fixed (for a long time).  For Andi's
testcases in comment #3, -fdump-tree-optimized reveals all these cases are
perceived as rotations by the early middle-end.=20

long long unsigned int f (long long unsigned int x, int y)
{
  return x_1(D) r<< y_2(D);
}

unsigned int f2 (unsigned int x, int y)
{
  return x_1(D) r<< y_2(D);
}

long long unsigned int f3 (long long unsigned int x)
{
  return x_1(D) r>> 55;
}

long unsigned int f4 (unsigned int x)
{
  return x_1(D) r>> 22;
}=