From patchwork Sun May 17 09:23:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandar Markovic X-Patchwork-Id: 1292105 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=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=EviypoJE; 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 49Pxn12SCRz9sT6 for ; Sun, 17 May 2020 19:34:29 +1000 (AEST) Received: from localhost ([::1]:59584 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jaFgh-0004BL-3U for incoming@patchwork.ozlabs.org; Sun, 17 May 2020 05:34:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36736) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jaFXB-0004W3-QD for qemu-devel@nongnu.org; Sun, 17 May 2020 05:24:37 -0400 Received: from mail-lj1-x243.google.com ([2a00:1450:4864:20::243]:43722) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jaFX9-0001ou-8K for qemu-devel@nongnu.org; Sun, 17 May 2020 05:24:37 -0400 Received: by mail-lj1-x243.google.com with SMTP id l19so6623444lje.10 for ; Sun, 17 May 2020 02:24:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=k9dCNJhoGWGfuroGDxBMJ68nEj9FrDwnLWLbmQBcmzU=; b=EviypoJE2fw11rg9d7cOApWxrPG9WjyHyQ4nej9/xzjmUWyLByq9Yg1pHUS0rahRoO pDJ1/TpQAgY1K0pE94YF1vFBPRcn8EY8EtWhRetrKJ1aEHqG4R3qsCUuKWhGHBHtgcKq V+fh4z6yQW4zXhYccG8n8GK2ryvQNcLB0xle6iLh/GFsN1v919XiEX2kBIlATMV4jQNG HK05DzNLFT/1CSOmrOC/1Rw/VZ1QfYu5TJesAFQJEopi5jsTPPekXwGQFRiDiVPYD9He sgDbY8a7NWEgrI1DAcSsMAnWW7A+MYRa6MiQNkJFiRQaCRcJ+iDw+OpL+Gl3pbcQjkat wkeQ== 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=k9dCNJhoGWGfuroGDxBMJ68nEj9FrDwnLWLbmQBcmzU=; b=cjNxX6pwvUl7Dn2Mg71gv8jjzjgZjf2ikwva20gJ7lyw9eb3fx/qG1l1k3SBVQtogj 47feHF8H+E8a16KhsT7NeznTzWaKh+rXD/eKb/vWbieIoy8a31WfHc3UiG/IQe2NPsm2 IZzPD109xgAWpQc0dOOGkhLnxuHITFno0hTcTz8/to8J6b6itgk1duquf+GfF0HpmEiD m4qLRKbTsLkTh1YKZnuWkbL5uXNZejxFq7iFzwg3Ew4r2xZ4PMA4/vHVNp/FE9J27bPi Iqm83Zr8YkzXciautliBqO0PIPy1mjdtwdqMVMd9AKJ48f3B19AYzBI7U2GT1SqrGU/z KdxQ== X-Gm-Message-State: AOAM533yqE3K6Z00nTemRHOx1n1+NpjvJiQvtEE7AnkK8r8jF7alyxIB wtudfVWNsNru7GYE24w5K1xoG05tDuM= X-Google-Smtp-Source: ABdhPJxncxpKj7eqvQmSQJdZnEjHeLSlqMO6KhAk4jAVOLvnNN3S1s3aMHPWh2ZEVWfabaFMe3hCOQ== X-Received: by 2002:a2e:8805:: with SMTP id x5mr7540844ljh.223.1589707472973; Sun, 17 May 2020 02:24:32 -0700 (PDT) Received: from localhost.localdomain ([109.245.227.98]) by smtp.gmail.com with ESMTPSA id l2sm3872138ljg.89.2020.05.17.02.24.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 May 2020 02:24:32 -0700 (PDT) From: Aleksandar Markovic To: qemu-devel@nongnu.org Subject: [PATCH v4 16/19] target/mips: fpu: Refactor conversion from ieee to mips exception flags Date: Sun, 17 May 2020 11:23:54 +0200 Message-Id: <20200517092357.1469-17-aleksandar.qemu.devel@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200517092357.1469-1-aleksandar.qemu.devel@gmail.com> References: <20200517092357.1469-1-aleksandar.qemu.devel@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::243; envelope-from=aleksandar.qemu.devel@gmail.com; helo=mail-lj1-x243.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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: aleksandar.rikalo@syrmia.com, Aleksandar Markovic Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The original coversion function is used for regular and MSA floating point instructions handling. Since there are some nuanced differences between regular and MSA floating point exception handling, provide two instances of the conversion function, rather than just a single common one. Inline both instances of this function instances for the sake of performance. Improve variable naming in surrounding code for clarity. Signed-off-by: Aleksandar Markovic --- target/mips/fpu_helper.c | 55 +++++++++++++++------------- target/mips/internal.h | 1 - target/mips/msa_helper.c | 77 +++++++++++++++++++++++++++------------- 3 files changed, 82 insertions(+), 51 deletions(-) diff --git a/target/mips/fpu_helper.c b/target/mips/fpu_helper.c index dbb8ca5692..7a3a61cab3 100644 --- a/target/mips/fpu_helper.c +++ b/target/mips/fpu_helper.c @@ -189,43 +189,48 @@ void helper_ctc1(CPUMIPSState *env, target_ulong arg1, uint32_t fs, uint32_t rt) } } -int ieee_ex_to_mips(int xcpt) +static inline int ieee_to_mips_xcpt(int ieee_xcpt) { - int ret = 0; - if (xcpt) { - if (xcpt & float_flag_invalid) { - ret |= FP_INVALID; - } - if (xcpt & float_flag_overflow) { - ret |= FP_OVERFLOW; - } - if (xcpt & float_flag_underflow) { - ret |= FP_UNDERFLOW; - } - if (xcpt & float_flag_divbyzero) { - ret |= FP_DIV0; - } - if (xcpt & float_flag_inexact) { - ret |= FP_INEXACT; - } + int mips_xcpt = 0; + + if (ieee_xcpt & float_flag_invalid) { + mips_xcpt |= FP_INVALID; + } + if (ieee_xcpt & float_flag_overflow) { + mips_xcpt |= FP_OVERFLOW; } - return ret; + if (ieee_xcpt & float_flag_underflow) { + mips_xcpt |= FP_UNDERFLOW; + } + if (ieee_xcpt & float_flag_divbyzero) { + mips_xcpt |= FP_DIV0; + } + if (ieee_xcpt & float_flag_inexact) { + mips_xcpt |= FP_INEXACT; + } + + return mips_xcpt; } static inline void update_fcr31(CPUMIPSState *env, uintptr_t pc) { - int tmp = ieee_ex_to_mips(get_float_exception_flags( - &env->active_fpu.fp_status)); + int ieee_exception_flags = get_float_exception_flags( + &env->active_fpu.fp_status); + int mips_exception_flags = 0; + + if (ieee_exception_flags) { + mips_exception_flags = ieee_to_mips_xcpt(ieee_exception_flags); + } - SET_FP_CAUSE(env->active_fpu.fcr31, tmp); + SET_FP_CAUSE(env->active_fpu.fcr31, mips_exception_flags); - if (tmp) { + if (mips_exception_flags) { set_float_exception_flags(0, &env->active_fpu.fp_status); - if (GET_FP_ENABLE(env->active_fpu.fcr31) & tmp) { + if (GET_FP_ENABLE(env->active_fpu.fcr31) & mips_exception_flags) { do_raise_exception(env, EXCP_FPE, pc); } else { - UPDATE_FP_FLAGS(env->active_fpu.fcr31, tmp); + UPDATE_FP_FLAGS(env->active_fpu.fcr31, mips_exception_flags); } } } diff --git a/target/mips/internal.h b/target/mips/internal.h index 1bf274b3ef..684356e309 100644 --- a/target/mips/internal.h +++ b/target/mips/internal.h @@ -224,7 +224,6 @@ uint32_t float_class_s(uint32_t arg, float_status *fst); uint64_t float_class_d(uint64_t arg, float_status *fst); extern unsigned int ieee_rm[]; -int ieee_ex_to_mips(int xcpt); void update_pagemask(CPUMIPSState *env, target_ulong arg1, int32_t *pagemask); static inline void restore_rounding_mode(CPUMIPSState *env) diff --git a/target/mips/msa_helper.c b/target/mips/msa_helper.c index 4065cfe4f7..c520405929 100644 --- a/target/mips/msa_helper.c +++ b/target/mips/msa_helper.c @@ -5419,54 +5419,81 @@ static inline void check_msacsr_cause(CPUMIPSState *env, uintptr_t retaddr) #define CLEAR_IS_INEXACT 2 #define RECIPROCAL_INEXACT 4 -static inline int update_msacsr(CPUMIPSState *env, int action, int denormal) + +static inline int ieee_to_mips_xcpt_msa(int ieee_xcpt) { - int ieee_ex; + int mips_xcpt = 0; - int c; + if (ieee_xcpt & float_flag_invalid) { + mips_xcpt |= FP_INVALID; + } + if (ieee_xcpt & float_flag_overflow) { + mips_xcpt |= FP_OVERFLOW; + } + if (ieee_xcpt & float_flag_underflow) { + mips_xcpt |= FP_UNDERFLOW; + } + if (ieee_xcpt & float_flag_divbyzero) { + mips_xcpt |= FP_DIV0; + } + if (ieee_xcpt & float_flag_inexact) { + mips_xcpt |= FP_INEXACT; + } + + return mips_xcpt; +} + +static inline int update_msacsr(CPUMIPSState *env, int action, int denormal) +{ + int ieee_exception_flags; + int mips_exception_flags = 0; int cause; int enable; - ieee_ex = get_float_exception_flags(&env->active_tc.msa_fp_status); + ieee_exception_flags = get_float_exception_flags( + &env->active_tc.msa_fp_status); /* QEMU softfloat does not signal all underflow cases */ if (denormal) { - ieee_ex |= float_flag_underflow; + ieee_exception_flags |= float_flag_underflow; + } + if (ieee_exception_flags) { + mips_exception_flags = ieee_to_mips_xcpt_msa(ieee_exception_flags); } - - c = ieee_ex_to_mips(ieee_ex); enable = GET_FP_ENABLE(env->active_tc.msacsr) | FP_UNIMPLEMENTED; /* Set Inexact (I) when flushing inputs to zero */ - if ((ieee_ex & float_flag_input_denormal) && + if ((ieee_exception_flags & float_flag_input_denormal) && (env->active_tc.msacsr & MSACSR_FS_MASK) != 0) { if (action & CLEAR_IS_INEXACT) { - c &= ~FP_INEXACT; + mips_exception_flags &= ~FP_INEXACT; } else { - c |= FP_INEXACT; + mips_exception_flags |= FP_INEXACT; } } /* Set Inexact (I) and Underflow (U) when flushing outputs to zero */ - if ((ieee_ex & float_flag_output_denormal) && + if ((ieee_exception_flags & float_flag_output_denormal) && (env->active_tc.msacsr & MSACSR_FS_MASK) != 0) { - c |= FP_INEXACT; + mips_exception_flags |= FP_INEXACT; if (action & CLEAR_FS_UNDERFLOW) { - c &= ~FP_UNDERFLOW; + mips_exception_flags &= ~FP_UNDERFLOW; } else { - c |= FP_UNDERFLOW; + mips_exception_flags |= FP_UNDERFLOW; } } /* Set Inexact (I) when Overflow (O) is not enabled */ - if ((c & FP_OVERFLOW) != 0 && (enable & FP_OVERFLOW) == 0) { - c |= FP_INEXACT; + if ((mips_exception_flags & FP_OVERFLOW) != 0 && + (enable & FP_OVERFLOW) == 0) { + mips_exception_flags |= FP_INEXACT; } /* Clear Exact Underflow when Underflow (U) is not enabled */ - if ((c & FP_UNDERFLOW) != 0 && (enable & FP_UNDERFLOW) == 0 && - (c & FP_INEXACT) == 0) { - c &= ~FP_UNDERFLOW; + if ((mips_exception_flags & FP_UNDERFLOW) != 0 && + (enable & FP_UNDERFLOW) == 0 && + (mips_exception_flags & FP_INEXACT) == 0) { + mips_exception_flags &= ~FP_UNDERFLOW; } /* @@ -5474,11 +5501,11 @@ static inline int update_msacsr(CPUMIPSState *env, int action, int denormal) * divide by zero */ if ((action & RECIPROCAL_INEXACT) && - (c & (FP_INVALID | FP_DIV0)) == 0) { - c = FP_INEXACT; + (mips_exception_flags & (FP_INVALID | FP_DIV0)) == 0) { + mips_exception_flags = FP_INEXACT; } - cause = c & enable; /* all current enabled exceptions */ + cause = mips_exception_flags & enable; /* all current enabled exceptions */ if (cause == 0) { /* @@ -5486,7 +5513,7 @@ static inline int update_msacsr(CPUMIPSState *env, int action, int denormal) * with all current exceptions */ SET_FP_CAUSE(env->active_tc.msacsr, - (GET_FP_CAUSE(env->active_tc.msacsr) | c)); + (GET_FP_CAUSE(env->active_tc.msacsr) | mips_exception_flags)); } else { /* Current exceptions are enabled */ if ((env->active_tc.msacsr & MSACSR_NX_MASK) == 0) { @@ -5495,11 +5522,11 @@ static inline int update_msacsr(CPUMIPSState *env, int action, int denormal) * with all enabled exceptions */ SET_FP_CAUSE(env->active_tc.msacsr, - (GET_FP_CAUSE(env->active_tc.msacsr) | c)); + (GET_FP_CAUSE(env->active_tc.msacsr) | mips_exception_flags)); } } - return c; + return mips_exception_flags; } static inline int get_enabled_exceptions(const CPUMIPSState *env, int c)