From patchwork Thu May 14 19:20:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandar Markovic X-Patchwork-Id: 11549637 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AB1DD14B7 for ; Thu, 14 May 2020 19:33:56 +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 814C520643 for ; Thu, 14 May 2020 19:33:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="QyfjAlUq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 814C520643 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:49332 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jZJcB-00012O-H1 for patchwork-qemu-devel@patchwork.kernel.org; Thu, 14 May 2020 15:33:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58202) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jZJQI-0007aw-Sl for qemu-devel@nongnu.org; Thu, 14 May 2020 15:21:40 -0400 Received: from mail-lj1-x243.google.com ([2a00:1450:4864:20::243]:39890) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jZJQE-0007Ob-83 for qemu-devel@nongnu.org; Thu, 14 May 2020 15:21:38 -0400 Received: by mail-lj1-x243.google.com with SMTP id u6so4789450ljl.6 for ; Thu, 14 May 2020 12:21:31 -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=5yZ4H4scvEuLdRxQjpBX/SfwA9bJahjWfAJAK11Z058=; b=QyfjAlUqSQsi2qQM8nXoSnTC1lPcGJi3aasKTJVcslA1AuMEyxtVcczymozL4Wy9gE 1SPZ5tR8V8QmhIcMX1iq1CmX57+NcYV+PMoyi8yy9hPZMwDsYWtwqd6Txet1dledocQB 78k1Ud/WOw8RBDfPHenKXAciuewUjynB9Vwm6mrgep1cBuPktJvCLR6KfhAUe5IFS2oo R25ZodV5j+w0CV+H3XSOKDY/xAK+IngrQkkg9fhWPFH1bGePShJ+XSWyUX3UIj+39Gtj A9tOVJb3GSsK2uucv0Z92R4ZTMqW88rOnCxuGrScDON4s+3X0AFq09Ou79kQVjBozLhe 2dfA== 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=5yZ4H4scvEuLdRxQjpBX/SfwA9bJahjWfAJAK11Z058=; b=KeRLSQ4BERAuz9jicFhomIj/OTg86N3pVYiJ4zGE6d0LSWGlVufjKzGsU9stfwU8PV s4dFhmC1LIocBcp4sxKxDqmj4tpm82tBBCUhIifm4fOKl3LTggRonFlQ6A9AbKQoJQzc /ZReqp3sJgYesoiA3EcIQi21OuvxEWgSOd9MaIz03VDZew/cpHgjdlFOlg/F3C13g576 KuIcChPBPN+9Tl2IVlEaDIlzMAogyD7O5qJhGzumW/e7gxirTAWqGXI6AGkOwLplimug IhIkhgeZLjizwspFa4+vhEvBNMVNA5hjoQmaHIjoYHPUC6N627Zt/bDIuRZ+cp1YaXox G7rw== X-Gm-Message-State: AOAM532isX731kHFnJdvcU0VJxYRVUzdEVcV7ppyFnWcndQjW9cTXe0Y 7M2YeMWXdURztcS3mfsIj/SeZD6030U= X-Google-Smtp-Source: ABdhPJyo7/BirfK6j+CuehAWHMIlrYllb4Zh45izk2hALQQm/Ck7sk2vaeD1F62NYK/bxqiXAfcwBg== X-Received: by 2002:a2e:7403:: with SMTP id p3mr3559682ljc.138.1589484089784; Thu, 14 May 2020 12:21:29 -0700 (PDT) Received: from localhost.localdomain ([109.245.227.98]) by smtp.gmail.com with ESMTPSA id h3sm2427257lfk.3.2020.05.14.12.21.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2020 12:21:29 -0700 (PDT) From: Aleksandar Markovic To: qemu-devel@nongnu.org Subject: [PATCH v2 16/17] target/mips: fpu: Refactor conversion from ieee to mips exception flags Date: Thu, 14 May 2020 21:20:46 +0200 Message-Id: <20200514192047.5297-17-aleksandar.qemu.devel@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200514192047.5297-1-aleksandar.qemu.devel@gmail.com> References: <20200514192047.5297-1-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@rt-rk.com, Aleksandar Markovic Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.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 floatin point excetion handling, provide two instances of the conversion function, rather than just a common one. Inline both of these 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)