From patchwork Mon Jan 3 16:48:54 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 77301 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 64C74B70E3 for ; Tue, 4 Jan 2011 04:23:35 +1100 (EST) Received: from localhost ([127.0.0.1]:41117 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PZo83-0006XR-SO for incoming@patchwork.ozlabs.org; Mon, 03 Jan 2011 12:23:31 -0500 Received: from [140.186.70.92] (port=51319 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PZnak-0002dx-KO for qemu-devel@nongnu.org; Mon, 03 Jan 2011 11:49:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PZnab-0003Ko-Ad for qemu-devel@nongnu.org; Mon, 03 Jan 2011 11:49:01 -0500 Received: from mnementh.archaic.org.uk ([81.2.115.146]:24861) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PZnab-0003JA-3S for qemu-devel@nongnu.org; Mon, 03 Jan 2011 11:48:57 -0500 Received: from pm215 by mnementh.archaic.org.uk with local (Exim 4.69) (envelope-from ) id 1PZnaY-0000cn-IR for qemu-devel@nongnu.org; Mon, 03 Jan 2011 16:48:54 +0000 From: Peter Maydell To: qemu-devel@nongnu.org Date: Mon, 3 Jan 2011 16:48:54 +0000 Message-Id: <1294073334-2373-3-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1294073334-2373-1-git-send-email-peter.maydell@linaro.org> References: <1294073334-2373-1-git-send-email-peter.maydell@linaro.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) Subject: [Qemu-devel] [PATCH 2/2] ARM: wire up the softfloat flush_input_to_zero flag X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Wire up the new softfloat support for flushing input denormals to zero on ARM. The FPSCR FZ bit enables flush-to-zero for both inputs and outputs, but the reporting of when inputs are flushed to zero is via a separate IDC bit rather than the UFC (underflow) bit used when output denormals are flushed to zero. Signed-off-by: Peter Maydell Acked-by: Aurelien Jarno --- target-arm/helper.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-) diff --git a/target-arm/helper.c b/target-arm/helper.c index 50c1017..705b99f 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -2242,6 +2242,8 @@ static inline int vfp_exceptbits_from_host(int host_bits) target_bits |= 8; if (host_bits & float_flag_inexact) target_bits |= 0x10; + if (host_bits & float_flag_input_denormal) + target_bits |= 0x80; return target_bits; } @@ -2278,6 +2280,8 @@ static inline int vfp_exceptbits_to_host(int target_bits) host_bits |= float_flag_underflow; if (target_bits & 0x10) host_bits |= float_flag_inexact; + if (target_bits & 0x80) + host_bits |= float_flag_input_denormal; return host_bits; } @@ -2310,12 +2314,14 @@ void HELPER(vfp_set_fpscr)(CPUState *env, uint32_t val) } set_float_rounding_mode(i, &env->vfp.fp_status); } - if (changed & (1 << 24)) + if (changed & (1 << 24)) { set_flush_to_zero((val & (1 << 24)) != 0, &env->vfp.fp_status); + set_flush_inputs_to_zero((val & (1 << 24)) != 0, &env->vfp.fp_status); + } if (changed & (1 << 25)) set_default_nan_mode((val & (1 << 25)) != 0, &env->vfp.fp_status); - i = vfp_exceptbits_to_host((val >> 8) & 0x1f); + i = vfp_exceptbits_to_host(val); set_float_exception_flags(i, &env->vfp.fp_status); }