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From: "belagod at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113780] New: [ARM] Incorrect indirect tailcall generated
 for PAC-enabled function.
Date: Tue, 06 Feb 2024 04:55:22 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113780

            Bug ID: 113780
           Summary: [ARM] Incorrect indirect tailcall generated for
                    PAC-enabled function.
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: belagod at gcc dot gnu.org
  Target Milestone: ---

For this piece of code:

void fail(void (*f)(int, int, int, int))
{
  f(1, 2, 3, 4);
}

compiled with -mcpu=3Dcortex-m85 -mbranch-protection=3Dpac-ret+leaf -O2 on =
trunk,
it generates:

fail:
        pac     ip, lr, sp
        movs    r3, #4
        movs    r2, #3
        movs    r1, #2
        movs    r0, #1
        push    {ip, lr}
        pop     {ip, lr}
        aut     ip, lr, sp
        bx      ip  @ indirect register sibling call=