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[97.113.169.147]) by smtp.gmail.com with ESMTPSA id 184sm6558109pfg.87.2018.02.23.16.34.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 23 Feb 2018 16:34:21 -0800 (PST) Subject: Re: [PATCH v3 22/31] arm/helper.c: re-factor recpe and add recepe_f16 To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-arm@nongnu.org Cc: qemu-devel@nongnu.org, Peter Maydell References: <20180223153636.29809-1-alex.bennee@linaro.org> <20180223153636.29809-23-alex.bennee@linaro.org> From: Richard Henderson Message-ID: <936e2bf8-e254-20fc-cfba-11fdff64a957@linaro.org> Date: Fri, 23 Feb 2018 16:34:19 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180223153636.29809-23-alex.bennee@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TUID: +VphDi0qwPBq On 02/23/2018 07:36 AM, Alex Bennée wrote: > It looks like the ARM ARM has simplified the pseudo code for the > calculation which is done on a fixed point 9 bit integer maths. So > while adding f16 we can also clean this up to be a little less heavy > on the floating point and just return the fractional part and leave > the calle's to do the final packing of the result. > > Signed-off-by: Alex Bennée > > --- > v3 > - fix comment 2.0^-16 > - f16_exp >= 29 (biased) > - remove confusing comment about fpst > --- Reviewed-by: Richard Henderson r~