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RT=6; SR=0; TI=SMTPD_---.IGxBKGW_1597302868; Received: from L-PF1D6DP4-1208.hz.ali.com(mailfrom:zhiwei_liu@c-sky.com fp:SMTPD_---.IGxBKGW_1597302868) by smtp.aliyun-inc.com(10.147.41.143); Thu, 13 Aug 2020 15:14:30 +0800 From: LIU Zhiwei To: qemu-devel@nongnu.org Subject: [PATCH 3/3] fpu/softfloat: Define misc operations for bfloat16 Date: Thu, 13 Aug 2020 15:14:21 +0800 Message-Id: <20200813071421.2509-4-zhiwei_liu@c-sky.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200813071421.2509-1-zhiwei_liu@c-sky.com> References: <20200813071421.2509-1-zhiwei_liu@c-sky.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: none client-ip=121.197.200.217; envelope-from=zhiwei_liu@c-sky.com; helo=smtp2200-217.mail.aliyun.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/13 03:14:30 X-ACL-Warn: Detected OS = Linux 3.x [generic] [fuzzy] X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alex.bennee@linaro.org, richard.henderson@linaro.org, LIU Zhiwei , aurelien@aurel32.net, peter.maydell@linaro.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: LIU Zhiwei Reviewed-by: Richard Henderson --- fpu/softfloat-specialize.inc.c | 38 +++++++++++++++++++++++++++++++ include/fpu/softfloat.h | 41 ++++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/fpu/softfloat-specialize.inc.c b/fpu/softfloat-specialize.inc.c index 034d18199c..1b6c4e47f8 100644 --- a/fpu/softfloat-specialize.inc.c +++ b/fpu/softfloat-specialize.inc.c @@ -259,6 +259,25 @@ bool float16_is_quiet_nan(float16 a_, float_status *status) #endif } +/*---------------------------------------------------------------------------- +| Returns 1 if the bfloat16 value `a' is a quiet +| NaN; otherwise returns 0. +*----------------------------------------------------------------------------*/ + +int bfloat16_is_quiet_nan(bfloat16 a_, float_status *status) +{ +#ifdef NO_SIGNALING_NANS + return bfloat16_is_any_nan(a_); +#else + uint16_t a = a_; + if (snan_bit_is_one(status)) { + return (((a >> 6) & 0x1FF) == 0x1FE) && (a & 0x3F); + } else { + return ((a >> 6) & 0x1FF) == 0x1FF; + } +#endif +} + /*---------------------------------------------------------------------------- | Returns 1 if the half-precision floating-point value `a' is a signaling | NaN; otherwise returns 0. @@ -278,6 +297,25 @@ bool float16_is_signaling_nan(float16 a_, float_status *status) #endif } +/*---------------------------------------------------------------------------- +| Returns 1 if the bfloat16 value `a' is a signaling +| NaN; otherwise returns 0. +*----------------------------------------------------------------------------*/ + +int bfloat16_is_signaling_nan(bfloat16 a_, float_status *status) +{ +#ifdef NO_SIGNALING_NANS + return 0; +#else + uint16_t a = a_; + if (snan_bit_is_one(status)) { + return ((a >> 6) & 0x1FF) == 0x1FF; + } else { + return (((a >> 6) & 0x1FF) == 0x1FE) && (a & 0x3F); + } +#endif +} + /*---------------------------------------------------------------------------- | Returns 1 if the single-precision floating-point value `a' is a quiet | NaN; otherwise returns 0. diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 4f72665b02..d7ce3e3483 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -372,6 +372,47 @@ static inline float16 float16_set_sign(float16 a, int sign) #define float16_three make_float16(0x4200) #define float16_infinity make_float16(0x7c00) +static inline int bfloat16_is_any_nan(bfloat16 a) +{ + return ((a & ~0x8000) > 0x7F80); +} + +static inline int bfloat16_is_neg(bfloat16 a) +{ + return a >> 15; +} + +static inline int bfloat16_is_infinity(bfloat16 a) +{ + return (a & 0x7fff) == 0x7F80; +} + +static inline int bfloat16_is_zero(bfloat16 a) +{ + return (a & 0x7fff) == 0; +} + +static inline int bfloat16_is_zero_or_denormal(bfloat16 a) +{ + return (a & 0x7F80) == 0; +} + +static inline bfloat16 bfloat16_abs(bfloat16 a) +{ + /* Note that abs does *not* handle NaN specially, nor does + * it flush denormal inputs to zero. + */ + return a & 0x7fff; +} + +static inline bfloat16 bfloat16_chs(bfloat16 a) +{ + /* Note that chs does *not* handle NaN specially, nor does + * it flush denormal inputs to zero. + */ + return a ^ 0x8000; +} + static inline bfloat16 bfloat16_set_sign(bfloat16 a, int sign) { return (a & 0x7fff) | (sign << 15); -- 2.23.0