From patchwork Sun May 24 23:47:26 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aurelien Jarno X-Patchwork-Id: 476027 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 505841402B9 for ; Mon, 25 May 2015 09:48:18 +1000 (AEST) Received: from localhost ([::1]:41190 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ywfcs-00047c-Pf for incoming@patchwork.ozlabs.org; Sun, 24 May 2015 19:48:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58251) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YwfcK-00036n-AO for qemu-devel@nongnu.org; Sun, 24 May 2015 19:47:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YwfcJ-00080X-7o for qemu-devel@nongnu.org; Sun, 24 May 2015 19:47:40 -0400 Received: from hall.aurel32.net ([2001:bc8:30d7:101::1]:40623) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YwfcJ-000800-1q for qemu-devel@nongnu.org; Sun, 24 May 2015 19:47:39 -0400 Received: from weber.rr44.fr ([2001:470:d4ed:0:7e05:7ff:fe0d:f152]) by hall.aurel32.net with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84) (envelope-from ) id 1YwfcG-0006oE-KW; Mon, 25 May 2015 01:47:36 +0200 Received: from aurel32 by weber.rr44.fr with local (Exim 4.85) (envelope-from ) id 1YwfcF-0005tD-PN; Mon, 25 May 2015 01:47:35 +0200 From: Aurelien Jarno To: qemu-devel@nongnu.org Date: Mon, 25 May 2015 01:47:26 +0200 Message-Id: <1432511251-22515-6-git-send-email-aurelien@aurel32.net> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1432511251-22515-1-git-send-email-aurelien@aurel32.net> References: <1432511251-22515-1-git-send-email-aurelien@aurel32.net> X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:bc8:30d7:101::1 Cc: Alexander Graf , Aurelien Jarno , Richard Henderson Subject: [Qemu-devel] [PATCH 05/10] target-s390x: detect tininess before rounding for FP operations X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The s390x floating point unit detects tininess before rounding, so set the softfloat fp_status up appropriately. Cc: Alexander Graf Cc: Richard Henderson Signed-off-by: Aurelien Jarno --- target-s390x/cpu.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c index d2f9836..7f17823 100644 --- a/target-s390x/cpu.c +++ b/target-s390x/cpu.c @@ -118,6 +118,10 @@ static void s390_cpu_initial_reset(CPUState *s) env->pfault_token = -1UL; + /* tininess for underflow is detected before rounding */ + set_float_detect_tininess(float_tininess_before_rounding, + &env->fpu_status); + /* Reset state inside the kernel that we cannot access yet from QEMU. */ if (kvm_enabled()) { kvm_s390_reset_vcpu(cpu); @@ -143,6 +147,10 @@ static void s390_cpu_full_reset(CPUState *s) env->pfault_token = -1UL; + /* tininess for underflow is detected before rounding */ + set_float_detect_tininess(float_tininess_before_rounding, + &env->fpu_status); + /* Reset state inside the kernel that we cannot access yet from QEMU. */ if (kvm_enabled()) { kvm_s390_reset_vcpu(cpu);