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From: "luc.vanoostenryck at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100056] New: [9/10/11 Regression]
Date: Tue, 13 Apr 2021 00:09:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100056

            Bug ID: 100056
           Summary: [9/10/11 Regression]
           Product: gcc
           Version: 9.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: luc.vanoostenryck at gmail dot com
  Target Milestone: ---
            Target: aarch64

Created attachment 50573
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50573&action=3Dedit
or-shift vs. [us]bfiz

On arm64, the following code:
    unsigned or_shift(unsigned char i)
    {
        return i | (i << 11);
    }

translate to the following assembly:
    or_shift:
        and     w1, w0, 255
        ubfiz   w0, w0, 11, 8
        orr     w0, w0, w1
        ret

where the ubfiz instruction is a bit weird since the code
matches directly what was generated in gcc 8.x and before:
    or_shift:
        and     w0, w0, 255
        orr     w0, w0, w0, lsl 11
        ret

Same with a signed argument (see https://gcc.godbolt.org/z/af4zffMYa ).=