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[114.34.229.221]) by smtp.gmail.com with ESMTPSA id q63sm14066788pjq.17.2021.04.18.22.56.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Apr 2021 22:56:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=from:to:cc:subject:date:message-id; bh=gcqCCC6OKs+bYQSdPy1A/MAjJhQLH5ZK4FDiW+OtHh4=; b=m7i3QgsaJ96KVn7aEBZPm1CPlxiTNpQ2UaD+eMH7mEHsNgW3DGyS1LaFFVZPX7DW0Z OVDqNtEz5f8O7zENBeRQzK8hz5X3QE26pj/HmnoXoV0ArTGMPKPh4hUy3MIwtuFrlrz2 f0nXtIdwiibdxew3gct4E6euBJAHv82ACk+XcXjhhtdzrcz3b72mh6p+veVJLDfHETed TCH2onH9qNkTazJ8tcXpXsVHzMaGCZe8teav3DhnMqVRiBddvss6uZCTH0HofB8UcUW8 y3LbdZxC5cMnf1+XcypFCmsiEf+oELsZfexwzR2qPWRWnPrpboXaGAYlDL9kWfaDs+mD fD/w== 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; bh=gcqCCC6OKs+bYQSdPy1A/MAjJhQLH5ZK4FDiW+OtHh4=; b=Hd1S6rnFOr6k5uGgr/DfJZsQaYExHDwFGkoB3kvX2/HMsjUMZa17xOwerJ7AuF2sip e4ZjGC3s7cO/vKLnFLQE+F+k/CqvdPh8JZNrzEzZ9IqK23Hs6SouoxM9aefxi/shqW5R VBL7CjNCWQRZn4ngrsDvUv0nBYw1FRo2acxEmAm0o0nU65bc0faC5cQRwZVx2gRB2m0R MEU7Bd7ZMQ7bgdupYcd2JAIkCzx/hhuGK/y2iL6v55MapzM1Q0j9m9zb0D6/sbXIMbvN E3Nj375M5pAAkj/4P1Dazf9VFDLkl+Kp2MiLawX3T68Lpo4dLa/jJPzJsGLFM8BzXJuX BTmw== X-Gm-Message-State: AOAM533aW8Qmjf4NhnrSnrIAe24nG9GrwrvQpdOivc9QLL8vmCH5sWXn S3Jo2EyhI/6Ofsj9SfLavlTMAIfLJYMjGtVb X-Google-Smtp-Source: ABdhPJx17sDxZtPdvUJ2wbvaO84l1FKVtm0RwtreNhH8rbfswHqqK5451HtWRDWd28pUFsy1dSBt6A== X-Received: by 2002:a17:902:a406:b029:e6:78c4:71c8 with SMTP id p6-20020a170902a406b02900e678c471c8mr21157220plq.17.1618811778196; Sun, 18 Apr 2021 22:56:18 -0700 (PDT) From: frank.chang@sifive.com To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Subject: [PATCH] fpu/softfloat: set invalid excp flag for RISC-V muladd instructions Date: Mon, 19 Apr 2021 13:56:10 +0800 Message-Id: <20210419055614.28361-1-frank.chang@sifive.com> X-Mailer: git-send-email 2.17.1 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::102f; envelope-from=frank.chang@sifive.com; helo=mail-pj1-x102f.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=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: Frank Chang , Peter Maydell , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Aurelien Jarno Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Frank Chang In IEEE 754-2008 spec: Invalid operation exception is signaled when doing: fusedMultiplyAdd(0, Inf, c) or fusedMultiplyAdd(Inf, 0, c) unless c is a quiet NaN; if c is a quiet NaN then it is implementation defined whether the invalid operation exception is signaled. In RISC-V Unprivileged ISA spec: The fused multiply-add instructions must set the invalid operation exception flag when the multiplicands are Inf and zero, even when the addend is a quiet NaN. This commit set invalid operation execption flag for RISC-V when multiplicands of muladd instructions are Inf and zero. Signed-off-by: Frank Chang --- fpu/softfloat-specialize.c.inc | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc index c2f87addb25..9c37265e20b 100644 --- a/fpu/softfloat-specialize.c.inc +++ b/fpu/softfloat-specialize.c.inc @@ -624,6 +624,23 @@ static int pickNaNMulAdd(FloatClass a_cls, FloatClass = b_cls, FloatClass c_cls, } else { return 1; } +#elif defined(TARGET_RISCV) + /* + * For RISC-V, InvalidOp is set when multiplicands are Inf and zero + * and returns default NaN. + */ + if (infzero) { + float_raise(float_flag_invalid, status); + return 3; + } + + if (is_nan(a_cls)) { + return 0; + } else if (is_nan(b_cls)) { + return 1; + } else { + return 2; + } #elif defined(TARGET_XTENSA) /* * For Xtensa, the (inf,zero,nan) case sets InvalidOp and returns --=20 2.17.1