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[97.113.8.179]) by smtp.gmail.com with ESMTPSA id o12-v6sm12258302pgv.7.2018.10.11.16.42.04 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 11 Oct 2018 16:42:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=aDUi/2KPKPuqwM/Oo0DDLTqdzuEHH3/tgSCRjp139f0=; b=ebejT+VNgr9ZAHVy04k3KyJkK5gn14S5d9aB/1G04lpORsvIRDvOy1YHJQlnnEhYFi xF1GNK3hhpU0E3g2HTuDXG73+werE0WklQqPv2v6yrQlX2iFaMEGSD7oduto5jbgP8Z7 VGd1MGW7pI27W13VoVm6AN6mfL4b6oM+WXimk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=aDUi/2KPKPuqwM/Oo0DDLTqdzuEHH3/tgSCRjp139f0=; b=ijBFwJ28mFkLg9BZvXt5kurPkxFeq5vKJdRyHsc7Ec1ODp4aMz3jtdTIt4x/zajZX+ s9k0lkvJrdTUtV8K1HZnwP7xcfCzr1sskhQi/+QnP2YU9BxfI+J+BxF8XQRFOHR3F50h JbqjWETwHkWCPvaGxzXW8tDn1fn44xiA6LZYGT7jfqgeOqolUO5UDcjkk7VJNXpBVG6F BXeavH3CjMYqO5WD5su7DJXBTLt2SZvsZjOJVC+LmBERqrUS5SmF7QajP4Rlz0yM+/bk gKEbiVkDYEd9ijNRejwex3hhU29LZ1lPhfX87QUvLaYDboSenAV49b7L9Khqa1FmIubS yPeg== X-Gm-Message-State: ABuFfojutUCPVlbxCRe/9Ey5VOdfobH2sAXdWR/1WqkNRDHVyyg92xCO GJSGdrZVU2A1X/CsLEry0joU6LhGCLo= X-Google-Smtp-Source: ACcGV60Ku8B5rbYpHiAdP9CZrOqoC+VLhxkhc9Ae0PvIbpYPCezH62zT1pVl03Ew5Dn/bc41DI3sJQ== X-Received: by 2002:a62:f20f:: with SMTP id m15-v6mr3567359pfh.244.1539301325688; Thu, 11 Oct 2018 16:42:05 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Thu, 11 Oct 2018 16:41:55 -0700 Message-Id: <20181011234159.11496-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181011234159.11496-1-richard.henderson@linaro.org> References: <20181011234159.11496-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::530 Subject: [Qemu-devel] [PATCH 3/7] target/ppc: Introduce fp number classification X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Having a separate, logical classifiation of numbers will unify more error paths for different formats. Signed-off-by: Richard Henderson --- target/ppc/fpu_helper.c | 94 ++++++++++++++++++++++------------------- 1 file changed, 51 insertions(+), 43 deletions(-) diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c index c9198f826d..9ae55b1e93 100644 --- a/target/ppc/fpu_helper.c +++ b/target/ppc/fpu_helper.c @@ -114,54 +114,62 @@ static inline int ppc_float64_get_unbiased_exp(float6= 4 f) return ((f >> 52) & 0x7FF) - 1023; } =20 -#define COMPUTE_FPRF(tp) \ -void helper_compute_fprf_##tp(CPUPPCState *env, tp arg) \ +/* Classify a floating-point number. */ +enum { + is_normal =3D 1, + is_zero =3D 2, + is_denormal =3D 4, + is_inf =3D 8, + is_qnan =3D 16, + is_snan =3D 32, + is_neg =3D 64, +}; + +#define COMPUTE_CLASS(tp) \ +static int tp##_classify(tp arg) \ { \ - int isneg; \ - int fprf; \ - \ - isneg =3D tp##_is_neg(arg); \ + int ret =3D tp##_is_neg(arg) * is_neg; \ if (unlikely(tp##_is_any_nan(arg))) { \ - if (tp##_is_signaling_nan(arg, &env->fp_status)) { \ - /* Signaling NaN: flags are undefined */ \ - fprf =3D 0x00; \ - } else { \ - /* Quiet NaN */ \ - fprf =3D 0x11; \ - } \ + float_status dummy =3D { }; /* snan_bit_is_one =3D 0 */ \ + ret |=3D (tp##_is_signaling_nan(arg, &dummy) \ + ? is_snan : is_qnan); \ } else if (unlikely(tp##_is_infinity(arg))) { \ - /* +/- infinity */ \ - if (isneg) { \ - fprf =3D 0x09; \ - } else { \ - fprf =3D 0x05; \ - } \ + ret |=3D is_inf; \ + } else if (tp##_is_zero(arg)) { \ + ret |=3D is_zero; \ + } else if (tp##_is_zero_or_denormal(arg)) { \ + ret |=3D is_denormal; \ } else { \ - if (tp##_is_zero(arg)) { \ - /* +/- zero */ \ - if (isneg) { \ - fprf =3D 0x12; \ - } else { \ - fprf =3D 0x02; \ - } \ - } else { \ - if (tp##_is_zero_or_denormal(arg)) { \ - /* Denormalized numbers */ \ - fprf =3D 0x10; \ - } else { \ - /* Normalized numbers */ \ - fprf =3D 0x00; \ - } \ - if (isneg) { \ - fprf |=3D 0x08; \ - } else { \ - fprf |=3D 0x04; \ - } \ - } \ + ret |=3D is_normal; \ } \ - /* We update FPSCR_FPRF */ \ - env->fpscr &=3D ~(0x1F << FPSCR_FPRF); \ - env->fpscr |=3D fprf << FPSCR_FPRF; \ + return ret; \ +} + +COMPUTE_CLASS(float16) +COMPUTE_CLASS(float32) +COMPUTE_CLASS(float64) +COMPUTE_CLASS(float128) + +static void set_fprf_from_class(CPUPPCState *env, int class) +{ + static const uint8_t fprf[6][2] =3D { + { 0x04, 0x08 }, /* normalized */ + { 0x02, 0x12 }, /* zero */ + { 0x14, 0x18 }, /* denormalized */ + { 0x05, 0x09 }, /* infinity */ + { 0x11, 0x11 }, /* qnan */ + { 0x00, 0x00 }, /* snan -- flags are undefined */ + }; + bool isneg =3D class & is_neg; + + env->fpscr &=3D ~(0x1F << FPSCR_FPRF); + env->fpscr |=3D fprf[ctz32(class)][isneg] << FPSCR_FPRF; +} + +#define COMPUTE_FPRF(tp) \ +void helper_compute_fprf_##tp(CPUPPCState *env, tp arg) \ +{ \ + set_fprf_from_class(env, tp##_classify(arg)); \ } =20 COMPUTE_FPRF(float16) --=20 2.17.1