From nobody Wed Nov 12 14:59:24 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1571648706; cv=none; d=zoho.com; s=zohoarc; b=giqGyVJnkrKA0cnnbd+uWvsUNG7ts4yDfSrUt8QwCj4FnAeDTsIS3o4AxnmLsDn9s2bet9PUig9DBR3BeL8vUrjFxTI553H5QvKc6N7vipnieE8qnPOAsARxRXRkWWZZoiBtCttcJNS9SAIz6RocEb8HD6RLCO6NGAEjzDfMu94= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1571648706; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=xxrTseFFVinnT6dz7W20NczKajlB+EKJ/qbB4WtneRk=; b=YPCiKqcCaWnZlPZgIdivUD2+AYkK1AuRqt+EX/DWppsgH6nbB8LP3K9WoGSt4VhXGazrsqeeoZnw0QxRlmpmjjA/ncx+e1hUGYGhOjAsbNuCOUuNfoPa3uuqsZ3J6k9KqhTaFq8XKM8Hz72MqsbF/sfE/LbBf4ExVMVekhCM3C8= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1571648706321495.1462063204697; Mon, 21 Oct 2019 02:05:06 -0700 (PDT) Received: from localhost ([::1]:36220 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iMTce-0001Mp-7j for importer@patchew.org; Mon, 21 Oct 2019 05:05:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59380) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iMTVS-0001O1-VR for qemu-devel@nongnu.org; Mon, 21 Oct 2019 04:57:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iMTVR-0008Jh-Pm for qemu-devel@nongnu.org; Mon, 21 Oct 2019 04:57:38 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:32750 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iMTVR-0008Iv-LE for qemu-devel@nongnu.org; Mon, 21 Oct 2019 04:57:37 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-36-fHKPS4pVMSOqsSnMasbm6w-1; Mon, 21 Oct 2019 04:57:33 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C13E5107AD31; Mon, 21 Oct 2019 08:57:32 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-198.ams2.redhat.com [10.36.116.198]) by smtp.corp.redhat.com (Postfix) with ESMTP id 417495D717; Mon, 21 Oct 2019 08:57:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571648257; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xxrTseFFVinnT6dz7W20NczKajlB+EKJ/qbB4WtneRk=; b=Ip3joPZuS+hBw/SAOWU7MJTrjc+joR1QiT7fh0LWQsdURMRwflOXa+VqvdW13oXL34X9Is eYnTof6bneQ60pCQujkV9QJyAd8fj8D9q+lSfDdcppM1HSPjVOGCdrKnL4O8lt+YjhnDYK UizT+cG8iQQloYXxvwKCmP7z712pBfk= From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v2 6/6] s390x/tcg: Fix VECTOR SUBTRACT WITH BORROW COMPUTE BORROW INDICATION Date: Mon, 21 Oct 2019 10:57:15 +0200 Message-Id: <20191021085715.3797-7-david@redhat.com> In-Reply-To: <20191021085715.3797-1-david@redhat.com> References: <20191021085715.3797-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-MC-Unique: fHKPS4pVMSOqsSnMasbm6w-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Huth , David Hildenbrand , Ivan Warren , Cornelia Huck , Richard Henderson , qemu-s390x@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" The numbers are unsigned, the computation is wrong. "Each operand is treated as an unsigned binary integer". Let's implement as given in the PoP: "A subtraction is performed by adding the contents of the second operand with the bitwise complement of the third operand along with a borrow indication from the rightmost bit of the fourth operand." Reuse gen_accc2_i64(). Fixes: bc725e65152c ("s390x/tcg: Implement VECTOR SUBTRACT WITH BORROW COMP= UTE BORROW INDICATION") Signed-off-by: David Hildenbrand Reviewed-by: Richard Henderson --- target/s390x/translate_vx.inc.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/target/s390x/translate_vx.inc.c b/target/s390x/translate_vx.in= c.c index fd746ba35f..71059f9ca0 100644 --- a/target/s390x/translate_vx.inc.c +++ b/target/s390x/translate_vx.inc.c @@ -2214,20 +2214,13 @@ static void gen_sbcbi2_i64(TCGv_i64 dl, TCGv_i64 dh= , TCGv_i64 al, TCGv_i64 ah, { TCGv_i64 th =3D tcg_temp_new_i64(); TCGv_i64 tl =3D tcg_temp_new_i64(); - TCGv_i64 zero =3D tcg_const_i64(0); =20 - tcg_gen_andi_i64(tl, cl, 1); - tcg_gen_sub2_i64(tl, th, al, zero, tl, zero); - tcg_gen_sub2_i64(tl, th, tl, th, bl, zero); - tcg_gen_andi_i64(th, th, 1); - tcg_gen_sub2_i64(tl, th, ah, zero, th, zero); - tcg_gen_sub2_i64(tl, th, tl, th, bh, zero); - tcg_gen_andi_i64(dl, th, 1); - tcg_gen_mov_i64(dh, zero); + tcg_gen_not_i64(tl, bl); + tcg_gen_not_i64(th, bh); + gen_accc2_i64(dl, dh, al, ah, tl, th, cl, ch); =20 tcg_temp_free_i64(tl); tcg_temp_free_i64(th); - tcg_temp_free_i64(zero); } =20 static DisasJumpType op_vsbcbi(DisasContext *s, DisasOps *o) --=20 2.21.0