From patchwork Fri May 21 20:17:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Bruno Larsen (billionai)" X-Patchwork-Id: 12273719 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45429C04FF3 for ; Fri, 21 May 2021 20:24:35 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id E222F6135A for ; Fri, 21 May 2021 20:24:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E222F6135A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=eldorado.org.br Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:53396 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lkBhC-0005kh-37 for qemu-devel@archiver.kernel.org; Fri, 21 May 2021 16:24:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50020) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lkBbR-00065W-Rv; Fri, 21 May 2021 16:18:37 -0400 Received: from [201.28.113.2] (port=1319 helo=outlook.eldorado.org.br) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lkBbP-0001Nf-UZ; Fri, 21 May 2021 16:18:37 -0400 Received: from power9a ([10.10.71.235]) by outlook.eldorado.org.br with Microsoft SMTPSVC(8.5.9600.16384); Fri, 21 May 2021 17:18:19 -0300 Received: from eldorado.org.br (unknown [10.10.71.235]) by power9a (Postfix) with ESMTP id 5663F8013E6; Fri, 21 May 2021 17:18:19 -0300 (-03) From: "Bruno Larsen (billionai)" To: qemu-devel@nongnu.org Subject: [PATCH v3 3/9] target/ppc: reduce usage of fpscr_set_rounding_mode Date: Fri, 21 May 2021 17:17:53 -0300 Message-Id: <20210521201759.85475-4-bruno.larsen@eldorado.org.br> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210521201759.85475-1-bruno.larsen@eldorado.org.br> References: <20210521201759.85475-1-bruno.larsen@eldorado.org.br> X-OriginalArrivalTime: 21 May 2021 20:18:19.0479 (UTC) FILETIME=[70B9CE70:01D74E7E] X-Host-Lookup-Failed: Reverse DNS lookup failed for 201.28.113.2 (failed) Received-SPF: pass client-ip=201.28.113.2; envelope-from=bruno.larsen@eldorado.org.br; helo=outlook.eldorado.org.br X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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: farosas@linux.ibm.com, richard.henderson@linaro.org, luis.pires@eldorado.org.br, lucas.araujo@eldorado.org.br, fernando.valle@eldorado.org.br, qemu-ppc@nongnu.org, matheus.ferst@eldorado.org.br, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" It is preferable to store the current rounding mode and retore from that than recalculating from fpscr, so we changed the behavior of do_fri and VSX_ROUND to do it like that. Suggested-by: Richard Henderson Signed-off-by: Bruno Larsen (billionai) Reviewed-by: Richard Henderson --- target/ppc/fpu_helper.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c index 44315fca0b..a4a283df2b 100644 --- a/target/ppc/fpu_helper.c +++ b/target/ppc/fpu_helper.c @@ -822,6 +822,7 @@ static inline uint64_t do_fri(CPUPPCState *env, uint64_t arg, int rounding_mode) { CPU_DoubleU farg; + FloatRoundMode old_rounding_mode = get_float_rounding_mode(&env->fp_status); farg.ll = arg; @@ -834,8 +835,7 @@ static inline uint64_t do_fri(CPUPPCState *env, uint64_t arg, float_flag_inexact; set_float_rounding_mode(rounding_mode, &env->fp_status); farg.ll = float64_round_to_int(farg.d, &env->fp_status); - /* Restore rounding mode from FPSCR */ - fpscr_set_rounding_mode(env); + set_float_rounding_mode(old_rounding_mode, &env->fp_status); /* fri* does not set FPSCR[XX] */ if (!inexact) { @@ -3136,8 +3136,10 @@ void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb) \ { \ ppc_vsr_t t = *xt; \ int i; \ + FloatRoundMode curr_rounding_mode; \ \ if (rmode != FLOAT_ROUND_CURRENT) { \ + curr_rounding_mode = get_float_rounding_mode(&env->fp_status); \ set_float_rounding_mode(rmode, &env->fp_status); \ } \ \ @@ -3160,7 +3162,7 @@ void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb) \ * mode from FPSCR \ */ \ if (rmode != FLOAT_ROUND_CURRENT) { \ - fpscr_set_rounding_mode(env); \ + set_float_rounding_mode(curr_rounding_mode, &env->fp_status); \ env->fp_status.float_exception_flags &= ~float_flag_inexact; \ } \ \