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From: "admin@tho-otto.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug modula2/110126] New: Variables are reported as unused when only
 referenced by ASM statements
Date: Mon, 05 Jun 2023 12:45:23 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: modula2
X-Bugzilla-Version: 13.1.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: admin@tho-otto.de
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: gaius at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110126

            Bug ID: 110126
           Summary: Variables are reported as unused when only referenced
                    by ASM statements
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: modula2
          Assignee: gaius at gcc dot gnu.org
          Reporter: admin@tho-otto.de
  Target Milestone: ---

In the following fragment:

MODULE foo;

VAR x: INTEGER;

PROCEDURE test;
BEGIN
  ASM("" : : "m"(x));
END test;

END foo.

x is reported as unused (same happens when specifying it as output paramete=
r)

Even worse, when used as input operand only, the whole asm statement seems =
to
be optimized away.=