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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
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Date: Wed, 01 Sep 2021 23:45:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102162

--- Comment #19 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Gimple level does look correct:
 <component_ref 0x7ffff7359300
    type <integer_type 0x7ffff7315b28 u32 readonly unsigned SI
        size <integer_cst 0x7ffff7244b40 constant 32>
        unit-size <integer_cst 0x7ffff7244b58 constant 4>
        align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff7315bd0 precision:32 min <integer_cst 0x7ffff7244b70 0> max <integer=
_cst
0x7ffff7244b28 4294967295> context <translation_unit_decl 0x7ffff733e870 t.=
c>>
    readonly
    arg:0 <mem_ref 0x7ffff735b2f8
        type <record_type 0x7ffff73159d8 readonly no-force-blk packed type_0
BLK size <integer_cst 0x7ffff7244b40 32> unit-size <integer_cst 0x7ffff7244=
b58
4>
            align:8 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff73159d8
            attributes <tree_list 0x7ffff732bd20
                purpose <identifier_node 0x7ffff7344690 packed>> fields
<field_decl 0x7ffff725ebe0 x> context <block 0x7ffff7338420>
            pointer_to_this <pointer_type 0x7ffff7315a80>>

        arg:0 <addr_expr 0x7ffff73326e0 type <pointer_type 0x7ffff7315888>
            constant arg:0 <var_decl 0x7ffff7ff6120 output_len>
            t.c:17:9 start: t.c:17:9 finish: t.c:17:39>
        arg:1 <integer_cst 0x7ffff733bf00 constant 0>>
    arg:1 <field_decl 0x7ffff725ebe0 x
        type <integer_type 0x7ffff7315738 u32 unsigned SI size <integer_cst
0x7ffff7244b40 32> unit-size <integer_cst 0x7ffff7244b58 4>
            align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-ty=
pe
0x7ffff7251690 precision:32 min <integer_cst 0x7ffff7244b70 0> max <integer=
_cst
0x7ffff7244b28 4294967295> context <translation_unit_decl 0x7ffff733e870 t.=
c>
            pointer_to_this <pointer_type 0x7ffff7315888>>
        unsigned packed SI t.c:12:33 size <integer_cst 0x7ffff7244b40 32>
unit-size <integer_cst 0x7ffff7244b58 4>
        align:8 warn_if_not_align:0 offset_align 128
        offset <integer_cst 0x7ffff7244930 constant 0>
        bit-offset <integer_cst 0x7ffff7244948 constant 0> context <record_=
type
0x7ffff7315930>>
    t.c:12:103 start: t.c:12:97 finish: t.c:12:105>

The var_decl too:
(gdb) p debug_tree(0x7ffff7ff6120)
 <var_decl 0x7ffff7ff6120 output_len
    type <integer_type 0x7ffff7315738 u32 unsigned SI
        size <integer_cst 0x7ffff7244b40 constant 32>
        unit-size <integer_cst 0x7ffff7244b58 constant 4>
        align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff7251690 precision:32 min <integer_cst 0x7ffff7244b70 0> max <integer=
_cst
0x7ffff7244b28 4294967295> context <translation_unit_decl 0x7ffff733e870 t.=
c>
        pointer_to_this <pointer_type 0x7ffff7315888>>
    addressable used public unsigned external read SI t.c:6:14 size
<integer_cst 0x7ffff7244b40 32> unit-size <integer_cst 0x7ffff7244b58 4>
    user align:8 warn_if_not_align:0 context <translation_unit_decl
0x7ffff733e870 t.c>
    attributes <tree_list 0x7ffff732bc30
        purpose <identifier_node 0x7ffff7344500 aligned>
        value <tree_list 0x7ffff732bbb8
            value <integer_cst 0x7ffff7244cf0 constant 1>>> chain
<function_decl 0x7ffff7336a00 test>>=