From patchwork Fri Sep 25 15:20:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 1371387 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=Ch/5el9y; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4BybPB5zt2z9sTM for ; Sat, 26 Sep 2020 01:26:54 +1000 (AEST) Received: from localhost ([::1]:46592 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kLpca-0006fO-RA for incoming@patchwork.ozlabs.org; Fri, 25 Sep 2020 11:26:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59778) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLpWs-00011R-L2 for qemu-devel@nongnu.org; Fri, 25 Sep 2020 11:20:58 -0400 Received: from mail-pg1-x541.google.com ([2607:f8b0:4864:20::541]:32785) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kLpWq-0005R7-Pk for qemu-devel@nongnu.org; Fri, 25 Sep 2020 11:20:58 -0400 Received: by mail-pg1-x541.google.com with SMTP id o25so2880114pgm.0 for ; Fri, 25 Sep 2020 08:20:56 -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=uxihFy3jRjyF4IIfuuRuE9+EnA2kbJYXXHsvttdZmDI=; b=Ch/5el9yv57dB5RkIXJjq+SgU8pUJwUdhl7EkN2DUfxGupPfdCP/LqaWMAK4O80udP 2Nl+WaBKDhaHFIHHMKa+MajN1kO5wZG4J/MhGvBfQfsEOq7JVzbGgYEAT1MCsL6a/2Gl jAC57TR/dWO0GYyjXxmrvDUrVwfZ6n/RYR+tZh9sAL9edpSbVtHy7mqvDu4vT3Aif4vu 9F9jJDjPmDjGAJjrHkUKq8qdi9GrgmQwPb6uuhMEVGsNxfuDakCorXMt4rFon5GNxJjN Bz6Ec7Lk7tnNpU/2KVdnDO8rlDFfCJBm4aSK/qzOxDCkBU7o05DYmSlywd7CKs4Tjdv4 ukCw== 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=uxihFy3jRjyF4IIfuuRuE9+EnA2kbJYXXHsvttdZmDI=; b=FCcfD61t+J1HaDqmSMgX1fX0XC3bbxzbeWhPnZAtztnu9rw2mog8AkgEnE5wwIPzvp Zo0P0T21rJxCwlLyW4Xh74IBNrk1u4gTkWq8rxn0ZrnONWzRYvk9/0Wp6kKNsKcxnHyE cpTFGCQdwWgYmkuuF48fb7g/pXQk6oJ8EOUMePuaVjc/8x2asEWlLXJHViIxS0ZjJhRW DQivmVi9y+fnYPOFC4bmJ23walBvHT+Jr3VyUoUJC+yOCNCBMl8XDylBG07pPucb/c22 vE5cf2lpskQFWX9S0u6wfvMucM9coOVuRnBFg9mJzY08ncDww9/fVKVKSmFmUACAoeoQ aiPA== X-Gm-Message-State: AOAM5304xuPiSmgL2xmocaPbKlklRsuufEy/sTznmIZvbql7b/NBATrU 56AUGbqL0IaKmZb+iqRPfeftgyuwKD3tdQ== X-Google-Smtp-Source: ABdhPJwUzxYfPZyOcF8OSS7FkmHUQ5bhF+NiD/Mw73lSSS83ynUBj+eSQZmQjumy49kXv4V6WdihZA== X-Received: by 2002:a63:78b:: with SMTP id 133mr428682pgh.381.1601047254974; Fri, 25 Sep 2020 08:20:54 -0700 (PDT) Received: from localhost.localdomain ([71.212.141.89]) by smtp.gmail.com with ESMTPSA id a5sm2717859pgk.13.2020.09.25.08.20.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Sep 2020 08:20:54 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 04/10] softfloat: Add float_cmask and constants Date: Fri, 25 Sep 2020 08:20:41 -0700 Message-Id: <20200925152047.709901-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200925152047.709901-1-richard.henderson@linaro.org> References: <20200925152047.709901-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::541; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x541.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+incoming=patchwork.ozlabs.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. Reviewed-by: David Hildenbrand Signed-off-by: Richard Henderson Reviewed-by: Alex Bennée --- 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;