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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/99396] std::rotl and std::rotr Does not
 convert into ROTATE on the gimple level
Date: Fri, 05 Mar 2021 10:38:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99396

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gn=
u.org

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 50303
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50303&action=3Dedit
gcc11-pr99396.patch

This seems to work for me (almost, there is a useless and for uchar/ushort)=
 on:
#include <bit>

unsigned char f1 (unsigned char x, int y) { return std::rotl (x, y); }
unsigned char f2 (unsigned char x, int y) { return std::rotr (x, y); }
unsigned short f3 (unsigned short x, int y) { return std::rotl (x, y); }
unsigned short f4 (unsigned short x, int y) { return std::rotr (x, y); }
unsigned int f5 (unsigned int x, int y) { return std::rotl (x, y); }
unsigned int f6 (unsigned int x, int y) { return std::rotr (x, y); }
unsigned long int f7 (unsigned long int x, int y) { return std::rotl (x, y)=
; }
unsigned long int f8 (unsigned long int x, int y) { return std::rotr (x, y)=
; }
unsigned long long int f9 (unsigned long long int x, int y) { return std::r=
otl
(x, y); }
unsigned long long int f10 (unsigned long long int x, int y) { return std::=
rotr
(x, y); }
//unsigned __int128 f11 (unsigned __int128 x, int y) { return std::rotl (x,=
 y);
}
//unsigned __int128 f12 (unsigned __int128 x, int y) { return std::rotr (x,=
 y);
}

constexpr auto a =3D std::rotl (1234U, 0);
constexpr auto b =3D std::rotl (1234U, 5);
constexpr auto c =3D std::rotl (1234U, -5);
constexpr auto d =3D std::rotl (1234U, -__INT_MAX__ - 1);=