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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99905] [8/9/10/11 Regression] wrong code with -mno-mmx
 -mno-sse since r7-4540-gb229ab2a712ccd44
Date: Wed, 07 Apr 2021 09:39:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99905

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The bug seems to be on extract_compound_operation called on
(zero_extract:DI (mem/c:TI (reg/f:DI 16 argp) [3 i+0 S16 A128])
    (const_int 16 [0x10])
    (const_int 63 [0x3f]))
We have:
  else if (unsignedp && len < HOST_BITS_PER_WIDE_INT)
    tem =3D simplify_and_const_int (NULL_RTX, mode,
                                  simplify_shift_const (NULL_RTX, LSHIFTRT,
                                                        mode, XEXP (x, 0),
                                                        pos),
                                  (HOST_WIDE_INT_1U << len) - 1);
but that calls simplify_shift_const with DImode and TImode MEM.
I think the shift needs to be done in inner_mode and the result then conver=
ted
to mode.=