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[176.182.122.208]) by smtp.gmail.com with ESMTPSA id p20-20020a1c7414000000b003fa8dbb7b5dsm11477231wmc.25.2023.08.20.23.16.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 20 Aug 2023 23:16:46 -0700 (PDT) Message-ID: <39c0089d-36f9-aae0-e9b5-9a64979773c5@linaro.org> Date: Mon, 21 Aug 2023 08:16:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.14.0 Subject: Re: [PATCH] softfloat: Handle m68k extended precision denormals properly To: Richard Henderson , qemu-devel@nongnu.org Cc: Keith Packard References: <20230821003237.376935-1-richard.henderson@linaro.org> Content-Language: en-US From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= In-Reply-To: <20230821003237.376935-1-richard.henderson@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::136; envelope-from=philmd@linaro.org; helo=mail-lf1-x136.google.com X-Spam_score_int: -63 X-Spam_score: -6.4 X-Spam_bar: ------ X-Spam_report: (-6.4 / 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, NICE_REPLY_A=-4.279, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 21/8/23 02:32, Richard Henderson wrote: > Motorola treats denormals with explicit integer bit set as > having unbiased exponent 0, unlike Intel which treats it as > having unbiased exponent 1 (like all other IEEE formats). > > Add a flag on FloatFmt to differentiate the behaviour. > > Reported-by: Keith Packard > Signed-off-by: Richard Henderson > --- > fpu/softfloat.c | 9 +++++- > tests/tcg/m68k/denormal.c | 53 ++++++++++++++++++++++++++++++++++ > fpu/softfloat-parts.c.inc | 5 ++-- > tests/tcg/m68k/Makefile.target | 2 +- > 4 files changed, 65 insertions(+), 4 deletions(-) > create mode 100644 tests/tcg/m68k/denormal.c Reviewed-by: Philippe Mathieu-Daudé