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[189.204.200.163]) by smtp.gmail.com with ESMTPSA id s5sm8500553qkg.88.2021.05.16.05.34.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 May 2021 05:34:41 -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 :mime-version:content-transfer-encoding; bh=J2jECUv0KB/VRaKbNWjXBjsVAbH6ZqCf4a3f43XZat8=; b=jwCh6rrfJbb1xV5SIS6Sij5OrpTm/g5qdLmso/I/C2kE/DEX7VAEfGHBmORiVbYhUh 5pfiOltwC5sQrQifPv2zejAIhUfETlDYBT3b8OWA+yeJ9SkeEz57KBGr4UVM6A1CWA6N zWZQ1r7UUTQ1kPwFfXnvK6eFlta3opfWVmw2fW+OOloLwl7XN2PA06isxycxH/JsaqxF R5Wo+X20b08hubWE/RG8y886IR/bLEJawu7oXXb7k8qnbhI2h3jbBz0khexP3BRupGIn +NzRSssbCLktewDw1nUCey9bgfqtikz9kD9baI7OuJsPtjgj1WltfOBXJr6jke8FG1Jr RSwg== 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:mime-version:content-transfer-encoding; bh=J2jECUv0KB/VRaKbNWjXBjsVAbH6ZqCf4a3f43XZat8=; b=VGsvnC2yLw2Qt60LcOgDlSEgnRZX8O5iJz4rWYdOjVvrUneW5Pi9y58Bh3qqKJ9o4V pky03ypAov1WqN54r1kByVZJ81Fxy9WHhV4ySR8gcX3gCFog7+y/VtDJlXzFSfWvSvRW KeyNBAevug/NPJdCxACxfzkf/NugPmbUVK2SaCuafI1KLCKLvfZ0wAbRoCuELYcF1ZZC gYX1BkLWTbxlt+4VWVMLn6A91Lwho827E1zYnaH2vsJrnvFEe/9oYFaSvLJYbGR2IkpO VZ5KZvAZa4M+djEq0yM+ImcNNOWGP7j0Pniasl10231/DAibMWwduvTNJFYMcRFtbavd 4zqw== X-Gm-Message-State: AOAM531pgBHhZT9YT4c5OcgagApqZlIZ4MjwJVGtj6ZzMoJxp7PTe8L7 c0WXy5hE7p/dj7kRPjx7AsUkQJcSRQJMpqjDyzc= X-Google-Smtp-Source: ABdhPJyWrxdR4n2RnESG15IEI+esRIZ/7THg3LCuXZhtCCkdaAkL4IEEPclTvhyKSjXNbFlFqW8Ltg== X-Received: by 2002:a37:7306:: with SMTP id o6mr16495344qkc.38.1621168481391; Sun, 16 May 2021 05:34:41 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PULL 10/46] softfloat: Add float_cmask and constants Date: Sun, 16 May 2021 07:33:55 -0500 Message-Id: <20210516123431.718318-11-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210516123431.718318-1-richard.henderson@linaro.org> References: <20210516123431.718318-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::72d; envelope-from=richard.henderson@linaro.org; helo=mail-qk1-x72d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: peter.maydell@linaro.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , David Hildenbrand Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Testing more than one class at a time is better done with masks. This reduces the static branch count. Reviewed-by: Alex Benn=C3=A9e Reviewed-by: David Hildenbrand Signed-off-by: Richard Henderson --- fpu/softfloat.c | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index ee4b5073b6..64edb23793 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -469,6 +469,20 @@ typedef enum __attribute__ ((__packed__)) { float_class_snan, } FloatClass; =20 +#define float_cmask(bit) (1u << (bit)) + +enum { + float_cmask_zero =3D float_cmask(float_class_zero), + float_cmask_normal =3D float_cmask(float_class_normal), + float_cmask_inf =3D float_cmask(float_class_inf), + float_cmask_qnan =3D float_cmask(float_class_qnan), + float_cmask_snan =3D float_cmask(float_class_snan), + + float_cmask_infzero =3D float_cmask_zero | float_cmask_inf, + float_cmask_anynan =3D float_cmask_qnan | float_cmask_snan, +}; + + /* Simple helpers for checking if, or what kind of, NaN we have */ static inline __attribute__((unused)) bool is_nan(FloatClass c) { @@ -1338,26 +1352,28 @@ bfloat16 QEMU_FLATTEN bfloat16_mul(bfloat16 a, bflo= at16 b, float_status *status) static FloatParts muladd_floats(FloatParts a, FloatParts b, FloatParts c, int flags, float_status *s) { - bool inf_zero =3D ((1 << a.cls) | (1 << b.cls)) =3D=3D - ((1 << float_class_inf) | (1 << float_class_zero)); - bool p_sign; + bool inf_zero, p_sign; bool sign_flip =3D flags & float_muladd_negate_result; FloatClass p_class; uint64_t hi, lo; int p_exp; + int ab_mask, abc_mask; + + ab_mask =3D float_cmask(a.cls) | float_cmask(b.cls); + abc_mask =3D float_cmask(c.cls) | ab_mask; + inf_zero =3D ab_mask =3D=3D float_cmask_infzero; =20 /* It is implementation-defined whether the cases of (0,inf,qnan) * and (inf,0,qnan) raise InvalidOperation or not (and what QNaN * they return if they do), so we have to hand this information * off to the target-specific pick-a-NaN routine. */ - if (is_nan(a.cls) || is_nan(b.cls) || is_nan(c.cls)) { + if (unlikely(abc_mask & float_cmask_anynan)) { return pick_nan_muladd(a, b, c, inf_zero, s); } =20 if (inf_zero) { float_raise(float_flag_invalid, s); - s->float_exception_flags |=3D float_flag_invalid; return parts_default_nan(s); } =20 @@ -1371,9 +1387,9 @@ static FloatParts muladd_floats(FloatParts a, FloatPa= rts b, FloatParts c, p_sign ^=3D 1; } =20 - if (a.cls =3D=3D float_class_inf || b.cls =3D=3D float_class_inf) { + if (ab_mask & float_cmask_inf) { p_class =3D float_class_inf; - } else if (a.cls =3D=3D float_class_zero || b.cls =3D=3D float_class_z= ero) { + } else if (ab_mask & float_cmask_zero) { p_class =3D float_class_zero; } else { p_class =3D float_class_normal; --=20 2.25.1