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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/96166] [10/11 Regression] -O3/-ftree-slp-vectorize turns
 ROL into a mess
Date: Fri, 12 Feb 2021 11:18:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96166

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |uros at gcc dot gnu.org

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So perhaps a peephole2 that matches
(insn 15 6 9 2 (set (reg:V2SI 21 xmm1 [91])
        (mem:V2SI (reg/v/f:DI 5 di [orig:86 x ] [86]) [0 MEM <long unsigned
int> [(char * {ref-all})x_2(D)]+0 S8 A8])) "pr96166.c":13:19 1288
{*movv2si_internal}
     (nil))
(insn 9 15 10 2 (set (reg:V2SI 20 xmm0 [88])
        (vec_select:V2SI (reg:V2SI 21 xmm1 [91])
            (parallel [
                    (const_int 1 [0x1])
                    (const_int 0 [0])
                ]))) "pr96166.c":13:19 1410 {*mmx_pshufd_1}
     (expr_list:REG_DEAD (reg:V2SI 21 xmm1 [91])
        (expr_list:REG_EQUIV (mem:V2SI (reg/v/f:DI 5 di [orig:86 x ] [86]) =
[0
MEM <long unsigned int> [(char * {ref-all})x_2(D)]+0 S8 A8])
            (nil))))
(insn 10 9 17 2 (set (mem:V2SI (reg/v/f:DI 5 di [orig:86 x ] [86]) [0 MEM <=
long
unsigned int> [(char * {ref-all})x_2(D)]+0 S8 A8])
        (reg:V2SI 20 xmm0 [88])) "pr96166.c":13:19 1288 {*movv2si_internal}
     (expr_list:REG_DEAD (reg:V2SI 20 xmm0 [88])
        (expr_list:REG_DEAD (reg/v/f:DI 5 di [orig:86 x ] [86])
            (nil))))
back into the rotate of the MEM?
No other ideas on my side :(=