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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/99405] New: Rotate with mask not optimized on x86 for
 QI/HImode rotates
Date: Fri, 05 Mar 2021 12:38:03 +0000
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X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99405

            Bug ID: 99405
           Summary: Rotate with mask not optimized on x86 for QI/HImode
                    rotates
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org, unlvsur at live dot com
        Depends on: 99396
  Target Milestone: ---

+++ This bug was initially created as a clone of Bug #99396 +++

In
unsigned char f1 (unsigned char x, unsigned y) { return (x << (y & 7)) | (x=
 >>
(-y & 7)); }
unsigned short f2 (unsigned short x, unsigned y) { return (x << (y & 15)) |=
 (x
>> (-y & 15)); }
unsigned int f3 (unsigned int x, unsigned y) { return (x << (y & 31)) | (x =
>>
(-y & 31)); }
unsigned char f4 (unsigned char x, unsigned y) { return (x >> (y & 7)) | (x=
 <<
(-y & 7)); }
unsigned short f5 (unsigned short x, unsigned y) { return (x >> (y & 15)) |=
 (x
<< (-y & 15)); }
unsigned int f6 (unsigned int x, unsigned y) { return (x >> (y & 31)) | (x =
<<
(-y & 31)); }
unsigned char f7 (unsigned char x, unsigned char y) { unsigned char v =3D y=
 & 7;
unsigned char w =3D -y & 7; return (x << v) | (x >> w); }
unsigned short f8 (unsigned short x, unsigned char y) { unsigned char v =3D=
 y &
15; unsigned char w =3D -y & 15; return (x << v) | (x >> w); }
unsigned int f9 (unsigned int x, unsigned char y) { unsigned char v =3D y &=
 31;
unsigned char w =3D -y & 31; return (x << v) | (x >> w); }
unsigned char f10 (unsigned char x, unsigned char y) { unsigned char v =3D =
y & 7;
unsigned char w =3D -y & 7; return (x >> v) | (x << w); }
unsigned short f11 (unsigned short x, unsigned char y) { unsigned char v =
=3D y &
15; unsigned char w =3D -y & 15; return (x >> v) | (x << w); }
unsigned int f12 (unsigned int x, unsigned char y) { unsigned char v =3D y =
& 31;
unsigned char w =3D -y & 31; return (x >> v) | (x << w); }
#ifdef __x86_64__
unsigned long long f13 (unsigned long long x, unsigned y) { return (x << (y=
 &
63)) | (x >> (-y & 63)); }
unsigned long long f14 (unsigned long long x, unsigned y) { return (x >> (y=
 &
63)) | (x << (-y & 63)); }
unsigned long long f15 (unsigned long long x, unsigned char y) { unsigned c=
har
v =3D y & 63; unsigned char w =3D -y & 63; return (x << v) | (x >> w); }
unsigned long long f16 (unsigned long long x, unsigned char y) { unsigned c=
har
v =3D y & 63; unsigned char w =3D -y & 63; return (x >> v) | (x << w); }
#endif

we don't optimize away the and instructions in f{1,2,4,5,7,8,10,11}.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99396
[Bug 99396] std::rotl and std::rotr Does not convert into ROTATE on the gim=
ple
level=