From patchwork Thu May 19 13:46:14 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 1537 Return-Path: Delivered-To: unknown Received: from imap.gmail.com (74.125.159.109) by localhost6.localdomain6 with IMAP4-SSL; 08 Jun 2011 14:52:50 -0000 Delivered-To: patches@linaro.org Received: by 10.224.54.134 with SMTP id q6cs115312qag; Thu, 19 May 2011 06:46:26 -0700 (PDT) Received: by 10.204.74.11 with SMTP id s11mr3133309bkj.43.1305812784262; Thu, 19 May 2011 06:46:24 -0700 (PDT) Received: from mnementh.archaic.org.uk (mnementh.archaic.org.uk [81.2.115.146]) by mx.google.com with ESMTPS id a6si8964578bka.96.2011.05.19.06.46.22 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 19 May 2011 06:46:23 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of pm215@archaic.org.uk designates 81.2.115.146 as permitted sender) client-ip=81.2.115.146; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of pm215@archaic.org.uk designates 81.2.115.146 as permitted sender) smtp.mail=pm215@archaic.org.uk Received: from pm215 by mnementh.archaic.org.uk with local (Exim 4.72) (envelope-from ) id 1QN3YR-00062G-8a; Thu, 19 May 2011 14:46:19 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Cc: patches@linaro.org, Paul Brook , Aurelien Jarno Subject: [PATCH v2 1/6] target-arm: Don't set FP exceptions in recip, recip_sqrt estimate fns Date: Thu, 19 May 2011 14:46:14 +0100 Message-Id: <1305812779-23175-2-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1305812779-23175-1-git-send-email-peter.maydell@linaro.org> References: <1305812779-23175-1-git-send-email-peter.maydell@linaro.org> The functions which do the core estimation algorithms for the VRSQRTE and VRECPE instructions should not set floating point exception flags, so use a local fp status for doing these calculations. Signed-off-by: Peter Maydell --- target-arm/helper.c | 12 ++++++++++-- 1 files changed, 10 insertions(+), 2 deletions(-) diff --git a/target-arm/helper.c b/target-arm/helper.c index 62ae72e..5ff6a9b 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -2749,7 +2749,11 @@ float32 HELPER(rsqrts_f32)(float32 a, float32 b, CPUState *env) */ static float64 recip_estimate(float64 a, CPUState *env) { - float_status *s = &env->vfp.standard_fp_status; + /* These calculations mustn't set any fp exception flags, + * so we use a local copy of the fp_status. + */ + float_status dummy_status = env->vfp.standard_fp_status; + float_status *s = &dummy_status; /* q = (int)(a * 512.0) */ float64 q = float64_mul(float64_512, a, s); int64_t q_int = float64_to_int64_round_to_zero(q, s); @@ -2812,7 +2816,11 @@ float32 HELPER(recpe_f32)(float32 a, CPUState *env) */ static float64 recip_sqrt_estimate(float64 a, CPUState *env) { - float_status *s = &env->vfp.standard_fp_status; + /* These calculations mustn't set any fp exception flags, + * so we use a local copy of the fp_status. + */ + float_status dummy_status = env->vfp.standard_fp_status; + float_status *s = &dummy_status; float64 q; int64_t q_int;