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[174.21.6.47]) by smtp.gmail.com with ESMTPSA id c19sm3431345pfk.22.2018.02.08.14.43.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 08 Feb 2018 14:43:54 -0800 (PST) Subject: Re: [Qemu-devel] [PATCH v2 22/32] arm/translate-a64: add FP16 FNEG/FABS to simd_two_reg_misc_fp16 To: =?UTF-8?Q?Alex_Benn=c3=a9e?= , qemu-arm@nongnu.org Cc: Peter Maydell , qemu-devel@nongnu.org References: <20180208173157.24705-1-alex.bennee@linaro.org> <20180208173157.24705-23-alex.bennee@linaro.org> From: Richard Henderson Message-ID: <23fab91d-1ca1-0c6c-800c-f7fe6a1c109e@linaro.org> Date: Thu, 8 Feb 2018 14:43:51 -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: <20180208173157.24705-23-alex.bennee@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TUID: FdPD0GBJr8KE On 02/08/2018 09:31 AM, Alex Bennée wrote: > + case 0x2f: /* FABS */ > + gen_helper_advsimd_absh(tcg_res, tcg_op); > + break; > + case 0x6f: /* FNEG */ > + tcg_gen_xori_i32(tcg_res, tcg_op, 0x8000); > + break; Why is ABS a function call while NEG a bit operation? r~