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Tue, 26 May 2020 03:56:56 -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-460-F5y16VB3ONqapqe9eu4Icg-1; Tue, 26 May 2020 03:56:47 -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 95AC4107ACCD; Tue, 26 May 2020 07:56:46 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-113-50.ams2.redhat.com [10.36.113.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 540F76ED99; Tue, 26 May 2020 07:56:42 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 12AFD9DB0; Tue, 26 May 2020 09:56:40 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1590479815; 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=ceuKaaK8VxDsRKmPx9fOojyazY5GYeQnwzsqN7EyL+U=; b=F7HQlrk4og1+PurcrHTkcCypXdexFwf+kTIyVDm/WdhtpE9f/oSHVmzt8f7H6si2SYy6mW C1kkPzSVzJIe0TUE9gdk4vA53TEmcdn0K4rAji/T+eL9Ez2DVljxV4szP9MvZ9Y5eqDko+ IRm6z8RlFliUgjHbI2GKLLrG1XRaNEg= X-MC-Unique: F5y16VB3ONqapqe9eu4Icg-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PULL 4/8] audio/mixeng: fix clang 10+ warning Date: Tue, 26 May 2020 09:56:35 +0200 Message-Id: <20200526075639.27949-5-kraxel@redhat.com> In-Reply-To: <20200526075639.27949-1-kraxel@redhat.com> References: <20200526075639.27949-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.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; Received-SPF: pass client-ip=205.139.110.120; envelope-from=kraxel@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/26 01:19:28 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Volker=20R=C3=BCmelin?= , Markus Armbruster , Aleksandar Markovic , Gerd Hoffmann , Aleksandar Rikalo , Aurelien Jarno Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) From: Volker R=C3=BCmelin The code in CONV_NATURAL_FLOAT() and CLIP_NATURAL_FLOAT() seems to use the constant 2^31-0.5 to convert float to integer and back. But the float type lacks the required precision and the constant used for the conversion is 2^31. This is equiva- lent to a [-1.f, 1.f] <-> [INT32_MIN, INT32_MAX + 1] mapping. This patch explicitly writes down the used constant. The compiler generated code doesn't change. The constant 2^31 has an exact float representation and the clang 10 compiler stops complaining about an implicit int to float conversion with a changed value. A few notes: - The conversion of 1.f to INT32_MAX + 1 doesn't overflow. The type of the destination variable is int64_t. - At a later stage one of the clip_* functions in audio/mixeng_template.h limits INT32_MAX + 1 to the integer range. - The clip_natural_float_* functions in audio/mixeng.c convert INT32_MAX and INT32_MAX + 1 to 1.f. Buglink: https://bugs.launchpad.net/bugs/1878627 Signed-off-by: Volker R=C3=BCmelin Message-id: 20200523201712.23908-1-vr_qemu@t-online.de Signed-off-by: Gerd Hoffmann --- audio/mixeng.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/audio/mixeng.c b/audio/mixeng.c index 739a500449ce..924dcb858af5 100644 --- a/audio/mixeng.c +++ b/audio/mixeng.c @@ -271,11 +271,12 @@ f_sample *mixeng_clip[2][2][2][3] =3D { #define CONV_NATURAL_FLOAT(x) (x) #define CLIP_NATURAL_FLOAT(x) (x) #else -static const float float_scale =3D UINT_MAX / 2.f; +/* macros to map [-1.f, 1.f] <-> [INT32_MIN, INT32_MAX + 1] */ +static const float float_scale =3D (int64_t)INT32_MAX + 1; #define CONV_NATURAL_FLOAT(x) ((x) * float_scale) =20 #ifdef RECIPROCAL -static const float float_scale_reciprocal =3D 2.f / UINT_MAX; +static const float float_scale_reciprocal =3D 1.f / ((int64_t)INT32_MAX + = 1); #define CLIP_NATURAL_FLOAT(x) ((x) * float_scale_reciprocal) #else #define CLIP_NATURAL_FLOAT(x) ((x) / float_scale) --=20 2.18.4