From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id DC0F73836C64; Tue,  2 Mar 2021 12:46:01 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DC0F73836C64
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/99339] Poor codegen with simple varargs
Date: Tue, 02 Mar 2021 12:46:01 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-99339-4-PW8gJblyNB@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-99339-4@http.gcc.gnu.org/bugzilla/>
References: <bug-99339-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 02 Mar 2021 12:46:02 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99339

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, clang manages to produce the following, which shows the situation coul=
d be
worse ;)

test_va:                                # @test_va
        .cfi_startproc
# %bb.0:
        subq    $88, %rsp
        .cfi_def_cfa_offset 96
        movl    %eax, %r10d
        movl    %edi, %eax
        testb   %r10b, %r10b
        je      .LBB0_2
# %bb.1:
        movaps  %xmm0, -48(%rsp)
        movaps  %xmm1, -32(%rsp)
        movaps  %xmm2, -16(%rsp)
        movaps  %xmm3, (%rsp)
        movaps  %xmm4, 16(%rsp)
        movaps  %xmm5, 32(%rsp)
        movaps  %xmm6, 48(%rsp)
        movaps  %xmm7, 64(%rsp)
.LBB0_2:
        movq    %rsi, -88(%rsp)
        movq    %rdx, -80(%rsp)
        movq    %rcx, -72(%rsp)
        movq    %r8, -64(%rsp)
        movq    %r9, -56(%rsp)
        leaq    -96(%rsp), %rcx
        movq    %rcx, -112(%rsp)
        leaq    96(%rsp), %rcx
        movq    %rcx, -120(%rsp)
        movabsq $206158430216, %rcx     # imm =3D 0x3000000008
        movq    %rcx, -128(%rsp)
        movl    $8, %edx
        cmpq    $40, %rdx
        ja      .LBB0_4
# %bb.3:
        movl    $8, %ecx
        addq    -112(%rsp), %rcx
        addl    $8, %edx
        movl    %edx, -128(%rsp)
        jmp     .LBB0_5
.LBB0_4:
        movq    -120(%rsp), %rcx
        leaq    8(%rcx), %rdx
        movq    %rdx, -120(%rsp)
.LBB0_5:
        addl    (%rcx), %eax
        addq    $88, %rsp
        .cfi_def_cfa_offset 8
        retq=