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dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34282 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kLLlC-00040Y-2D for qemu-devel@archiver.kernel.org; Thu, 24 Sep 2020 03:33:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41002) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLLk1-00038i-Ig for qemu-devel@nongnu.org; Thu, 24 Sep 2020 03:32:33 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:32278) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kLLjz-0000V8-74 for qemu-devel@nongnu.org; Thu, 24 Sep 2020 03:32:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600932750; 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:autocrypt:autocrypt; bh=Z/mZVKI3U+tsnmisHqbscjyCdPv/uVWKxaAds/A7sm4=; b=VO0Zul7Dfd1QTwBUf0ic1Y6+zTxv2LT/BaTiJEiW1m8AdUif7gzbt38zlBh1y8x7saujsP bM14nEssri0BMHrzjUPpIUdYNrrNAwd2EqO0XWneBRz1YOnH/OJHhNNpN4y4S7hUA/B4YL tf5FybVjXKzRTV7o2KAbXidF2p6wBnM= 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-132-EeLqvYb0OMiCd5jasTS52A-1; Thu, 24 Sep 2020 03:32:28 -0400 X-MC-Unique: EeLqvYb0OMiCd5jasTS52A-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 297C164091; Thu, 24 Sep 2020 07:32:27 +0000 (UTC) Received: from [10.36.114.4] (ovpn-114-4.ams2.redhat.com [10.36.114.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id 12B975D990; Thu, 24 Sep 2020 07:32:25 +0000 (UTC) Subject: Re: [PATCH 1/8] softfloat: Use mulu64 for mul64To128 To: Richard Henderson , qemu-devel@nongnu.org References: <20200924012453.659757-1-richard.henderson@linaro.org> <20200924012453.659757-2-richard.henderson@linaro.org> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200924012453.659757-2-richard.henderson@linaro.org> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/24 01:10:00 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.228, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: alex.bennee@linaro.org, bharata@linux.ibm.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 24.09.20 03:24, Richard Henderson wrote: > Via host-utils.h, we use a host widening multiply for > 64-bit hosts, and a common subroutine for 32-bit hosts. > > Signed-off-by: Richard Henderson > --- > include/fpu/softfloat-macros.h | 24 ++++-------------------- > 1 file changed, 4 insertions(+), 20 deletions(-) > > diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h > index a35ec2893a..57845f8af0 100644 > --- a/include/fpu/softfloat-macros.h > +++ b/include/fpu/softfloat-macros.h > @@ -83,6 +83,7 @@ this code that are retained. > #define FPU_SOFTFLOAT_MACROS_H > > #include "fpu/softfloat-types.h" > +#include "qemu/host-utils.h" > > /*---------------------------------------------------------------------------- > | Shifts `a' right by the number of bits given in `count'. If any nonzero > @@ -515,27 +516,10 @@ static inline void > | `z0Ptr' and `z1Ptr'. > *----------------------------------------------------------------------------*/ > > -static inline void mul64To128( uint64_t a, uint64_t b, uint64_t *z0Ptr, uint64_t *z1Ptr ) > +static inline void > +mul64To128(uint64_t a, uint64_t b, uint64_t *z0Ptr, uint64_t *z1Ptr) > { > - uint32_t aHigh, aLow, bHigh, bLow; > - uint64_t z0, zMiddleA, zMiddleB, z1; > - > - aLow = a; > - aHigh = a>>32; > - bLow = b; > - bHigh = b>>32; > - z1 = ( (uint64_t) aLow ) * bLow; > - zMiddleA = ( (uint64_t) aLow ) * bHigh; > - zMiddleB = ( (uint64_t) aHigh ) * bLow; > - z0 = ( (uint64_t) aHigh ) * bHigh; > - zMiddleA += zMiddleB; > - z0 += ( ( (uint64_t) ( zMiddleA < zMiddleB ) )<<32 ) + ( zMiddleA>>32 ); > - zMiddleA <<= 32; > - z1 += zMiddleA; > - z0 += ( z1 < zMiddleA ); > - *z1Ptr = z1; > - *z0Ptr = z0; > - > + mulu64(z1Ptr, z0Ptr, a, b); > } > > /*---------------------------------------------------------------------------- > Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb