From patchwork Wed Mar 30 17:59:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matheus K. Ferst" X-Patchwork-Id: 12796143 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AEDFCC433F5 for ; Wed, 30 Mar 2022 18:02:46 +0000 (UTC) Received: from localhost ([::1]:39514 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nZceb-00033W-K8 for qemu-devel@archiver.kernel.org; Wed, 30 Mar 2022 14:02:45 -0400 Received: from eggs.gnu.org ([209.51.188.92]:41456) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nZcba-0000Au-31; Wed, 30 Mar 2022 13:59:38 -0400 Received: from [187.72.171.209] (port=21948 helo=outlook.eldorado.org.br) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nZcbY-0004ik-B1; Wed, 30 Mar 2022 13:59:37 -0400 Received: from p9ibm ([10.10.71.235]) by outlook.eldorado.org.br over TLS secured channel with Microsoft SMTPSVC(8.5.9600.16384); Wed, 30 Mar 2022 14:59:33 -0300 Received: from eldorado.org.br (unknown [10.10.70.45]) by p9ibm (Postfix) with ESMTP id 70C4D8002AF; Wed, 30 Mar 2022 14:59:33 -0300 (-03) From: matheus.ferst@eldorado.org.br To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Subject: [RFC PATCH 0/8] Alternative softfloat 128-bit integer support Date: Wed, 30 Mar 2022 14:59:24 -0300 Message-Id: <20220330175932.6995-1-matheus.ferst@eldorado.org.br> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-OriginalArrivalTime: 30 Mar 2022 17:59:33.0824 (UTC) FILETIME=[E98B6C00:01D8445F] X-Host-Lookup-Failed: Reverse DNS lookup failed for 187.72.171.209 (failed) Received-SPF: pass client-ip=187.72.171.209; envelope-from=matheus.ferst@eldorado.org.br; helo=outlook.eldorado.org.br X-Spam_score_int: -4 X-Spam_score: -0.5 X-Spam_bar: / X-Spam_report: (-0.5 / 5.0 requ) BAYES_00=-1.9, PDS_HP_HELO_NORDNS=0.659, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: danielhb413@gmail.com, richard.henderson@linaro.org, groug@kaod.org, clg@kaod.org, Matheus Ferst , david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Matheus Ferst This RFC is an alternative to [1] using Int128 types to implement the 128-bit integer conversion routines in softfloat required by the xscv[su]qqp and xscvqp[su]qz instructions of PowerISA v3.1. Some improvements to int128.h are made in patches 1 and 2. Patches 3-6 implement the conversion routines, and patches 7 and 8 implement the new instructions. RFC: Int128 vs. pair of 64-bit values. - Returning unsigned values through Int128 is not ideal, but creating an "UInt128" just for this case seems excessive. - OTOH, there are fewer cases to handle, especially in float->int. [1] https://lists.gnu.org/archive/html/qemu-ppc/2022-03/msg00520.html Matheus Ferst (8): qemu/int128: avoid undefined behavior in int128_lshift qemu/int128: add int128_urshift softfloat: add uint128_to_float128 softfloat: add int128_to_float128 softfloat: add float128_to_uint128 softfloat: add float128_to_int128 target/ppc: implement xscv[su]qqp target/ppc: implement xscvqp[su]qz fpu/softfloat.c | 183 ++++++++++++++++++++++++++++ include/fpu/softfloat.h | 7 ++ include/qemu/int128.h | 25 +++- target/ppc/fpu_helper.c | 33 +++++ target/ppc/helper.h | 4 + target/ppc/insn32.decode | 7 ++ target/ppc/translate/vsx-impl.c.inc | 22 ++++ tests/unit/test-int128.c | 32 +++++ 8 files changed, 311 insertions(+), 2 deletions(-)