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bh=HKNMswTN1113NtwpvIjxyVH7EOFTcQvPOD8dmxhJgNY=; b=EsfdXtJAV/pp2DCeAofggnLC8tgZkLY2VS82oLbfOCY7qSrhqYBSEYGd8uu0Rt3LFS/2IQ gmTVDy/umXUN1Pwpk5m1iNeDrUm9ifDl9ci7LToRFDhUHEEFXuFgOCaarg9lzMAZiG471u EDYWZ9pT4+HaJK9LEPJPhvfsj7zXOBo= 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-225-nlf_S5MgNBCGDmrNjxHKZQ-1; Thu, 01 Oct 2020 13:30:49 -0400 X-MC-Unique: nlf_S5MgNBCGDmrNjxHKZQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D90B564082; Thu, 1 Oct 2020 17:30:47 +0000 (UTC) Received: from [10.36.112.77] (ovpn-112-77.ams2.redhat.com [10.36.112.77]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8CCF510013BD; Thu, 1 Oct 2020 17:30:45 +0000 (UTC) Subject: Re: [PATCH v1 03/20] s390x/tcg: Implement VECTOR MULTIPLY SUM LOGICAL To: Richard Henderson , qemu-devel@nongnu.org References: <20200930145523.71087-1-david@redhat.com> <20200930145523.71087-4-david@redhat.com> 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: X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 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=216.205.24.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/01 04:25:37 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 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, NICE_REPLY_A=-0.26, 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: qemu-s390x@nongnu.org, Cornelia Huck , Thomas Huth Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 01.10.20 17:26, Richard Henderson wrote: > On 9/30/20 9:55 AM, David Hildenbrand wrote: >> + /* Multipy both even elements from v2 and v3 */ >> + read_vec_element_i64(l1, get_field(s, v2), 0, ES_64); >> + read_vec_element_i64(h1, get_field(s, v3), 0, ES_64); >> + tcg_gen_mulu2_i64(l1, h1, l1, h1); >> + /* Shift result left by one bit if requested */ >> + if (extract32(get_field(s, m6), 3, 1)) { >> + tcg_gen_extract2_i64(h1, l1, h1, 63); >> + tcg_gen_shli_i64(l1, l1, 1); >> + } > > Not a bug, but some hosts require 3 insns for extract2 (so 4 total for this > sequence). > > This doubling can also be had via add2: > > tcg_gen_add2_i64(l1, h1, l1, h1, l1, h1); Took me longer than it should to realize this is really just doubling the value ... will use tcg_gen_add2_i64() and add a comment. Thanks! -- Thanks, David / dhildenb