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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]:34376 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kLLvz-0007Yc-8G for qemu-devel@archiver.kernel.org; Thu, 24 Sep 2020 03:44:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42746) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLLs2-0002S6-3g for qemu-devel@nongnu.org; Thu, 24 Sep 2020 03:40:50 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:36522) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kLLrz-0001Ld-K3 for qemu-devel@nongnu.org; Thu, 24 Sep 2020 03:40:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600933247; 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=yv4pNmWwM6jkG8XlA2D+2eBmR/P5QIYOx0zuQhy4EuI=; b=UYa/L3PFonfX9fN0boqwaqdUY0GHJDT8XcoalRXq5prpEEEPeELvU82mus2So9QRfbsksa LmfOigoezxzC4l+SxKJHTozt4FVznB1+VXdhbzLa6W+H9Wx5TNuVtSn/FSYiZg2M7sq+DD RulTwom5wul2TVYJY5lzsOIRB8P/qaI= 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-267-iVoOqBrHM3yjLA2knOnS0w-1; Thu, 24 Sep 2020 03:40:43 -0400 X-MC-Unique: iVoOqBrHM3yjLA2knOnS0w-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0386364153; Thu, 24 Sep 2020 07:40:42 +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 EFD229CBA; Thu, 24 Sep 2020 07:40:40 +0000 (UTC) Subject: Re: [PATCH 4/8] softfloat: Add float_cmask and constants To: Richard Henderson , qemu-devel@nongnu.org References: <20200924012453.659757-1-richard.henderson@linaro.org> <20200924012453.659757-5-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: <20200924012453.659757-5-richard.henderson@linaro.org> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 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-Transfer-Encoding: 7bit Content-Language: en-US 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 = 2020/09/22 23:02:20 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: > Testing more than one class at a time is better done with masks. > This reduces the static branch count. > > Signed-off-by: Richard Henderson > --- > 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; > Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb