From patchwork Thu Sep 24 01:24:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 304591 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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,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 5E4C9C4363D for ; Thu, 24 Sep 2020 01:26:20 +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 99EF22145D for ; Thu, 24 Sep 2020 01:26:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="xQI2BUod" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 99EF22145D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38830 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kLG1a-0006cm-GW for qemu-devel@archiver.kernel.org; Wed, 23 Sep 2020 21:26:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43742) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLG0N-0004r8-Dv for qemu-devel@nongnu.org; Wed, 23 Sep 2020 21:25:03 -0400 Received: from mail-pj1-x1044.google.com ([2607:f8b0:4864:20::1044]:34931) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kLG0L-0005hd-LS for qemu-devel@nongnu.org; Wed, 23 Sep 2020 21:25:03 -0400 Received: by mail-pj1-x1044.google.com with SMTP id jw11so697396pjb.0 for ; Wed, 23 Sep 2020 18:25:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=DTuyn50RwqtJUsMxHJmqO9znr03h7lV5LqctzDmaByI=; b=xQI2BUod19ya/B++dGru/GRtvSs88IP5q1gYYE9G+2T931ZT4dA6MhmISVErRfCw1p lZr0beeILt/Yt+GclMxigiMrTpt0gagWL4JsDwLj6d6jzY/86qyDib5Raj6733stDh6v apLQnb9QKl1G5EV2QZz78cxOajZhFtlbhD+E+BKnhO8avHwOGryWSqKtvLajE0hkMmgn RL2OgMAZQy0ksicd2fBwCwIu+n41zRzuWSxd/2KLrC/D2LvR92leV9P0lNYbrts5St/H d54tOTsiXnD0cUhKUBep5Ylof4zzH4FSh+TuuD6Kzv2JxtK/NCyAoO1WJraIF0X3RiIb WtdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DTuyn50RwqtJUsMxHJmqO9znr03h7lV5LqctzDmaByI=; b=ope19jHOtvbuibLFwdWQozi6x/4T/QuejOidl7XZxf6qnZcSqT1LXxvXgIGq3K/tRi GtwfyaFG54fvtq9Pr9C6k3s5yBKlX2qPc7f3AvCbmgR6BYr1OTSFfI/EXoY7BqjFCQiw Jpdl8qLX4SBfB3BJZxQtGy2V0LiokoOCd22wafBrk1YH0tYqJzb3Njtzc/YuXQnNzFm6 gp2wK1ikQQKRkcXYhmRoJ6SxcVpXpBi4xkX6Uwba4UFess/vUns+8/rdGMEBc225oB0d elsZcCppArIbBnT9ei9fG+qCqoC7EyMfE7/ckjyrckMHRq5Nvpg4spMHGqKFZnk3EQnE bWwQ== X-Gm-Message-State: AOAM5336GtdSgib2HUYd7prJjh0YLdo5/fAVCklWY8u0160wsUUv6/pK MBN+igFGV0pGikbq/bxR5FlrB9PaDKG98A== X-Google-Smtp-Source: ABdhPJwI8F5VmWnywQHLADZakL0nvz2OxDUf1+KM81fSU9G27FqNdOvYWVhSIqM0/Ted7gmxzbVupA== X-Received: by 2002:a17:902:16b:b029:d2:565e:a70b with SMTP id 98-20020a170902016bb02900d2565ea70bmr2407520plb.42.1600910699993; Wed, 23 Sep 2020 18:24:59 -0700 (PDT) Received: from localhost.localdomain ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id k27sm938432pgm.29.2020.09.23.18.24.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2020 18:24:59 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 4/8] softfloat: Add float_cmask and constants Date: Wed, 23 Sep 2020 18:24:49 -0700 Message-Id: <20200924012453.659757-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200924012453.659757-1-richard.henderson@linaro.org> References: <20200924012453.659757-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::1044; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1044.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: bharata@linux.ibm.com, alex.bennee@linaro.org, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Testing more than one class at a time is better done with masks. This reduces the static branch count. Signed-off-by: Richard Henderson Reviewed-by: David Hildenbrand --- fpu/softfloat.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 9db55d2b11..3e625c47cd 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -469,6 +469,20 @@ typedef enum __attribute__ ((__packed__)) { float_class_snan, } FloatClass; +#define float_cmask(bit) (1u << (bit)) + +enum { + float_cmask_zero = float_cmask(float_class_zero), + float_cmask_normal = float_cmask(float_class_normal), + float_cmask_inf = float_cmask(float_class_inf), + float_cmask_qnan = float_cmask(float_class_qnan), + float_cmask_snan = float_cmask(float_class_snan), + + float_cmask_infzero = float_cmask_zero | float_cmask_inf, + float_cmask_anynan = float_cmask_qnan | float_cmask_snan, +}; + + /* Simple helpers for checking if, or what kind of, NaN we have */ static inline __attribute__((unused)) bool is_nan(FloatClass c) { @@ -1335,24 +1349,27 @@ bfloat16 QEMU_FLATTEN bfloat16_mul(bfloat16 a, bfloat16 b, float_status *status) static FloatParts muladd_floats(FloatParts a, FloatParts b, FloatParts c, int flags, float_status *s) { - bool inf_zero = ((1 << a.cls) | (1 << b.cls)) == - ((1 << float_class_inf) | (1 << float_class_zero)); - bool p_sign; + bool inf_zero, p_sign; bool sign_flip = flags & float_muladd_negate_result; FloatClass p_class; uint64_t hi, lo; int p_exp; + int ab_mask, abc_mask; + + ab_mask = float_cmask(a.cls) | float_cmask(b.cls); + abc_mask = float_cmask(c.cls) | ab_mask; + inf_zero = ab_mask == float_cmask_infzero; /* It is implementation-defined whether the cases of (0,inf,qnan) * and (inf,0,qnan) raise InvalidOperation or not (and what QNaN * they return if they do), so we have to hand this information * off to the target-specific pick-a-NaN routine. */ - if (is_nan(a.cls) || is_nan(b.cls) || is_nan(c.cls)) { + if (unlikely(abc_mask & float_cmask_anynan)) { return pick_nan_muladd(a, b, c, inf_zero, s); } - if (inf_zero) { + if (unlikely(inf_zero)) { s->float_exception_flags |= float_flag_invalid; return parts_default_nan(s); } @@ -1367,9 +1384,9 @@ static FloatParts muladd_floats(FloatParts a, FloatParts b, FloatParts c, p_sign ^= 1; } - if (a.cls == float_class_inf || b.cls == float_class_inf) { + if (ab_mask & float_cmask_inf) { p_class = float_class_inf; - } else if (a.cls == float_class_zero || b.cls == float_class_zero) { + } else if (ab_mask & float_cmask_zero) { p_class = float_class_zero; } else { p_class = float_class_normal;