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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102162] Byte-wise access optimized away at -O1 and
 above
Date: Wed, 01 Sep 2021 22:56:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102162

--- Comment #15 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The trunk works:
        .LEVEL 1.1
        .text
        .align 4
.globl test
        .type   test, @function
test:
        .PROC
        .CALLINFO FRAME=3D0,NO_CALLS
        .ENTRY
        addil LR'output_len-$global$,%r27
        ldo RR'output_len-$global$(%r1),%r20
        ldb RR'output_len-$global$(%r1),%r28
        zdep %r28,7,8,%r28
        ldb 1(%r20),%r19
        zdep %r19,15,16,%r19
        or %r19,%r28,%r19
        ldb 2(%r20),%r28
        zdep %r28,23,24,%r28
        or %r28,%r19,%r28
        ldb 3(%r20),%r19
        bv %r0(%r2)
        or %r19,%r28,%r28
        .EXIT
        .PROCEND
        .size   test, .-test
        .ident  "GCC: (GNU) 12.0.0 20210901 (experimental)"=