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X-Received-From: 2607:f8b0:4864:20::143 Subject: [Qemu-devel] [PATCH 1/2] Implement Floating Point flag Fraction Rounded X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John Arbuckle Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: John Arbuckle Reviewed-by: Richard Henderson --- fpu/softfloat.c | 15 ++++++++++++--- include/fpu/softfloat-types.h | 1 + 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 2ba36ec370..ac34f6a2de 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -702,7 +702,7 @@ static FloatParts round_canonical(FloatParts p, float_s= tatus *s, const uint64_t roundeven_mask =3D parm->roundeven_mask; const int exp_max =3D parm->exp_max; const int frac_shift =3D parm->frac_shift; - uint64_t frac, inc; + uint64_t frac, inc, rounded; int exp, flags =3D 0; bool overflow_norm; =20 @@ -744,7 +744,12 @@ static FloatParts round_canonical(FloatParts p, float_= status *s, if (likely(exp > 0)) { if (frac & round_mask) { flags |=3D float_flag_inexact; - frac +=3D inc; + rounded =3D frac + inc; + if ((rounded ^ frac) & frac_lsb) { + flags |=3D float_flag_rounded; + } + frac =3D rounded; + if (frac & DECOMPOSED_OVERFLOW_BIT) { frac >>=3D 1; exp++; @@ -793,7 +798,11 @@ static FloatParts round_canonical(FloatParts p, float_= status *s, break; } flags |=3D float_flag_inexact; - frac +=3D inc; + rounded =3D frac + inc; + if ((rounded ^ frac) & frac_lsb) { + flags |=3D float_flag_rounded; + } + frac =3D rounded; } =20 exp =3D (frac & DECOMPOSED_IMPLICIT_BIT ? 1 : 0); diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h index 2aae6a89b1..bee576e0fd 100644 --- a/include/fpu/softfloat-types.h +++ b/include/fpu/softfloat-types.h @@ -147,6 +147,7 @@ enum { =20 enum { float_flag_invalid =3D 1, + float_flag_rounded =3D 2, float_flag_divbyzero =3D 4, float_flag_overflow =3D 8, float_flag_underflow =3D 16, --=20 2.14.3 (Apple Git-98) From nobody Fri May 3 13:40:08 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1558751022; cv=none; d=zoho.com; s=zohoarc; b=ErVVruMetk+vV8HcLSjswUiiXvv56tqlTi3VUbfy6MW+8c9qP/5QIhz28qmKKFlHR6Gv1VeH4YPWa5+N/drmXteQOy8qUSlHiF2FJVLY0BDDNaPhaXT/UvDaMcz2pkod0UTUPiyMnV4h/iZooCOO9B163IU8fb5Rjv8tpx0KnuA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1558751022; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=FaLRym9qoHWfpYrSmaKpwioVaNz4Jc0X02F6oDD3AfA=; b=P8AezyxPKeR7joC/jtNJDGy/wTVHeP18otpzbqvOSt7Z41ex9ZSzsDbDElhdec9t6xtZqAFxPzvY7aYr0Akm2MwIgPZ8iQUFnvrg9AFSgguAuInLfKOyUIMDSzfP1OXl6ZYIUZtYE8NbmWKjEcXD90iLhWuq/F064oIKeg/n4gk= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1558751022426894.9882778647004; Fri, 24 May 2019 19:23:42 -0700 (PDT) Received: from localhost ([127.0.0.1]:34822 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hUMLI-0001Mq-Gq for importer@patchew.org; Fri, 24 May 2019 22:23:28 -0400 Received: from eggs.gnu.org ([209.51.188.92]:50975) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hUMJm-0000UP-H9 for qemu-devel@nongnu.org; Fri, 24 May 2019 22:21:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hUMIW-0003aY-7G for qemu-devel@nongnu.org; Fri, 24 May 2019 22:20:37 -0400 Received: from mail-it1-x144.google.com ([2607:f8b0:4864:20::144]:56126) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hUMIW-0003aQ-32 for qemu-devel@nongnu.org; Fri, 24 May 2019 22:20:36 -0400 Received: by mail-it1-x144.google.com with SMTP id g24so11930317iti.5 for ; Fri, 24 May 2019 19:20:36 -0700 (PDT) Received: from localhost.localdomain (d14-69-20-184.try.wideopenwest.com. 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X-Received-From: 2607:f8b0:4864:20::144 Subject: [Qemu-devel] [PATCH 2/2] Implement the PowerPC Floating Point Status and Control Register Fraction Rounded bit X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John Arbuckle Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: John Arbuckle --- target/ppc/fpu_helper.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c index 0b7308f539..0baf1ce8e4 100644 --- a/target/ppc/fpu_helper.c +++ b/target/ppc/fpu_helper.c @@ -630,6 +630,10 @@ static void do_float_check_status(CPUPPCState *env, ui= ntptr_t raddr) env->fpscr &=3D ~(1 << FPSCR_FI); /* clear the FPSCR[FI] bit */ } =20 + /* Set or clear the Fraction Rounded bit */ + env->fpscr =3D deposit32(env->fpscr, FPSCR_FR, 1, + (status & float_flag_rounded) !=3D 0); + if (cs->exception_index =3D=3D POWERPC_EXCP_PROGRAM && (env->error_code & POWERPC_EXCP_FP)) { /* Differred floating-point exception after target FPR update */ --=20 2.14.3 (Apple Git-98)