From patchwork Fri Oct 25 14:12:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 13850804 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 9B7A7D0C614 for ; Fri, 25 Oct 2024 14:18:27 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t4L4I-0004Vj-II; Fri, 25 Oct 2024 10:13:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t4L48-0004LR-3P for qemu-devel@nongnu.org; Fri, 25 Oct 2024 10:13:24 -0400 Received: from mail-wm1-x336.google.com ([2a00:1450:4864:20::336]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1t4L3v-0007tQ-Tu for qemu-devel@nongnu.org; Fri, 25 Oct 2024 10:13:23 -0400 Received: by mail-wm1-x336.google.com with SMTP id 5b1f17b1804b1-43169902057so20482035e9.0 for ; Fri, 25 Oct 2024 07:13:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1729865590; x=1730470390; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=R0KwrJ+RLRqyfxTos/cR3Np44ABB8RBfSuYyJrILdGI=; b=F7nS6GVrZ6Ud5EY3wzWxnRC3v0jBOi+8Gh0/KNexEOm8jNQ6jjTPC0oLlfO+QDfiUl Ayke1GDj7kHX9yRk7QdjRSocLxQDWolEDWQnWy3jvo2kvZ2jVwThVF1cyyvb9Z+aZ6VW cXpI3vbr84tnrbXSMKiXwlG90xUg/E0Kaoe7cQFlk6mwfAYzGywW71enQCT7Nc0naleU XfgyC5dHqI5k0JHMhNvobWEg1gW3NFx2/Ixh4ZJJKmkZS98zWCHq0tlx7vigM25tx2cK b4VzTR0LaG3AyTwOUBDarPxH/keGoVFYN0tmzK/GDHpAVBeRl4x/7Rf6ZDEK8Zk1Nsjz BeDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729865590; x=1730470390; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=R0KwrJ+RLRqyfxTos/cR3Np44ABB8RBfSuYyJrILdGI=; b=fSNnz1S3PqQ6e690FiVUs7ubYIxXBH/CkLUrW6zUoZPj7rZn+XZCXoZoygtGgrluBs Mhiq6m1pDd9122leBvYvIyt3lUE3UYJQembKWzc6l6H4GnIzjwRMOiAPDJjyzewoYIqN MgWEtvlPgFO7sQ7nqJQF/tv3zMkViBFIIzj2hF05JeVWMUImcUDJjEAb1cHa6ZhZRANp kq39a1Re5IsoqZEnggx85Fy6j+LrY/mCU+aidpzosjebgRp1/KK/4RYCU+RPyJSSFPyI JT40Dy/E5rOt2poo310EDGmeFZz8KeDAYom5Tm8bGNNahGW896X+19/1jkuxVBYcek8P rg6w== X-Forwarded-Encrypted: i=1; AJvYcCVbYoJjc3GIs1rIYicd/d56CGez4esSIHYLzxlSmMNNB4E3FUfT6V8Cl8h9lGAdoTFYjgsR91I0QGlb@nongnu.org X-Gm-Message-State: AOJu0YxKxZBkwVx5fWFiuCg8jRvvtwjgYKnf0OR8SWvKSshMgbKszBHZ FsAqhG5dq7xAPVeOFVlgloTuF/ThxyEV7JuDS6U5Mw1Y9sYiZoDXk6yF9u+YJr8= X-Google-Smtp-Source: AGHT+IElscYFzJMkYmD7qnmfjnyWZqUI37VMxIDiiFWHpHvVdX7AL5ahkCq804b4/QejsLD1QmJqwg== X-Received: by 2002:a05:600c:1e08:b0:431:2b66:44f7 with SMTP id 5b1f17b1804b1-431841a5fe1mr81921395e9.31.1729865590281; Fri, 25 Oct 2024 07:13:10 -0700 (PDT) Received: from orth.archaic.org.uk (orth.archaic.org.uk. [2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4318b57b051sm50104535e9.42.2024.10.25.07.13.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Oct 2024 07:13:10 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: =?utf-8?q?Alex_Benn=C3=A9e?= , Richard Henderson , =?utf-8?q?Philippe_Mathie?= =?utf-8?q?u-Daud=C3=A9?= , Song Gao , Eduardo Habkost , "Edgar E. Iglesias" , Jiaxun Yang , Aleksandar Rikalo , Stafford Horne , Nicholas Piggin , Daniel Henrique Barboza , Yoshinori Sato , David Hildenbrand , Ilya Leoshkevich , Thomas Huth , Mark Cave-Ayland , Artyom Tarasenko , Max Filippov , qemu-ppc@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH 16/21] target/alpha: Explicitly set 2-NaN propagation rule Date: Fri, 25 Oct 2024 15:12:49 +0100 Message-Id: <20241025141254.2141506-17-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241025141254.2141506-1-peter.maydell@linaro.org> References: <20241025141254.2141506-1-peter.maydell@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::336; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x336.google.com 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=unavailable 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Set the NaN propagation rule explicitly for the float_status word used in this target. This is a no-behaviour-change commit, so we retain the existing behaviour of x87-style pick-largest-significand NaN propagation. This is however not the architecturally correct handling, so we leave a TODO note to that effect. We also leave a TODO note pointing out that all this code in the cpu initfn (including the existing setting up of env->flags and the FPCR) should be in a currently non-existent CPU reset function. Signed-off-by: Peter Maydell --- target/alpha/cpu.c | 11 +++++++++++ fpu/softfloat-specialize.c.inc | 2 +- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/target/alpha/cpu.c b/target/alpha/cpu.c index 9db1dffc03e..5d75c941f7a 100644 --- a/target/alpha/cpu.c +++ b/target/alpha/cpu.c @@ -24,6 +24,7 @@ #include "qemu/qemu-print.h" #include "cpu.h" #include "exec/exec-all.h" +#include "fpu/softfloat.h" static void alpha_cpu_set_pc(CPUState *cs, vaddr value) @@ -187,7 +188,17 @@ static void alpha_cpu_initfn(Object *obj) { CPUAlphaState *env = cpu_env(CPU(obj)); + /* TODO all this should be done in reset, not init */ + env->lock_addr = -1; + + /* + * TODO: this is incorrect. The Alpha Architecture Handbook version 4 + * describes NaN propagation in section 4.7.10.4. We should prefer + * the operand in Fb (whether it is a QNaN or an SNaN), then the + * operand in Fa. That is float_2nan_prop_ba. + */ + set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status); #if defined(CONFIG_USER_ONLY) env->flags = ENV_FLAG_PS_USER | ENV_FLAG_FEN; cpu_alpha_store_fpcr(env, (uint64_t)(FPCR_INVD | FPCR_DZED | FPCR_OVFD diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc index 77ebc8216f6..a5c3e2b8de5 100644 --- a/fpu/softfloat-specialize.c.inc +++ b/fpu/softfloat-specialize.c.inc @@ -406,7 +406,7 @@ static int pickNaN(FloatClass a_cls, FloatClass b_cls, || defined(TARGET_LOONGARCH64) || defined(TARGET_HPPA) \ || defined(TARGET_S390X) || defined(TARGET_PPC) || defined(TARGET_M68K) \ || defined(TARGET_SPARC) || defined(TARGET_XTENSA) \ - || defined(TARGET_I386) + || defined(TARGET_I386) || defined(TARGET_ALPHA) g_assert_not_reached(); #else rule = float_2nan_prop_x87;