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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/71336] Suboptimal x86 code generated for "(a &
 1) ? (CST1 + CST2) : CST1"
Date: Tue, 20 Jul 2021 00:03:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D71336

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2016-05-30 00:00:00         |2021-7-19

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Something like (very much pesdu code):
(simplify
 (cond (eq (bit_and@0 @1 int_pow2p@2) integer_zerop) INTEGET_CST@3
INTEGER_CST@4)
 (switch
  (if (@3 u> @4 && exact_pow2(@3 - @4))
   (convert (plus (mult @0:typeu (minus @3:typeu @4:typeu)) @4:typeu)))
  (if (@4 u> @3 && exact_pow2(@4 - @3))
   (convert (minus (mult @0:typeu (minus @4:typeu @3:typeu)) @3:typeu))
 ))=