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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/104549] Missing variable at O2/O3 likely caused by
 -fearly-inlining
Date: Wed, 16 Feb 2022 13:01:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104549

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

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

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The assembly of main is:
main:
.LFB1:
        # pr104549.c:9:1
        .loc 1 9 1
        .cfi_startproc
# BLOCK 2, count:1073741824 (estimated locally) seq:0
# PRED: ENTRY [always]  count:1073741824 (estimated locally) (FALLTHRU)
        # pr104549.c:10:5
        .loc 1 10 5
.LBB4:
.LBB5:
        # pr104549.c:3:5
        .loc 1 3 5
.LVL2:
        # DEBUG i =3D> 0
        # pr104549.c:4:5
        .loc 1 4 5
        # pr104549.c:4:19
        .loc 1 4 19
        # pr104549.c:4:12
        .loc 1 4 12
        # pr104549.c:5:5
        .loc 1 5 5
.LBE5:
.LBE4:
        # pr104549.c:9:1
        .loc 1 9 1 is_stmt 0
        subq    $8, %rsp
        .cfi_def_cfa_offset 16
.LBB7:
.LBB6:
        # pr104549.c:5:5
        .loc 1 5 5
        xorl    %edi, %edi
        xorl    %eax, %eax
        call    test
.LVL3:
.LBE6:
.LBE7:
        # pr104549.c:11:1
        .loc 1 11 1
        xorl    %eax, %eax
        addq    $8, %rsp
        .cfi_def_cfa_offset 8
# SUCC: EXIT [always]  count:1073741824 (estimated locally)
        ret
with -O2 -g -dA, the inlined a is in the .LBB4...LBE4 and .LBB7...LBE7 rang=
es
but the first range is empty (no insns in it), the
very first insn in main doesn't belong to the inline function and .loc for =
it
is line 9, perhaps the debugger chooses some other one because of the is_st=
mt
0?
With -gno-statement-frontiers the debugger reports main's { as the first
location.=