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[174.21.70.228]) by smtp.gmail.com with ESMTPSA id l6sm1669928pjf.28.2021.05.25.15.58.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 May 2021 15:58:21 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 05/12] softfpu: Add float_round_to_odd_inf Date: Tue, 25 May 2021 15:58:10 -0700 Message-Id: <20210525225817.400336-6-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210525225817.400336-1-richard.henderson@linaro.org> References: <20210525225817.400336-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::429; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x429.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: qemu-arm@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For Arm BFDOT and BFMMLA, we need a version of round-to-odd that overflows to infinity, instead of the max normal number. Cc: Alex Bennée Signed-off-by: Richard Henderson --- include/fpu/softfloat-types.h | 4 +++- fpu/softfloat-parts.c.inc | 6 ++++-- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h index 8a3f20fae9..3b757c3d6a 100644 --- a/include/fpu/softfloat-types.h +++ b/include/fpu/softfloat-types.h @@ -134,8 +134,10 @@ typedef enum __attribute__((__packed__)) { float_round_up = 2, float_round_to_zero = 3, float_round_ties_away = 4, - /* Not an IEEE rounding mode: round to the closest odd mantissa value */ + /* Not an IEEE rounding mode: round to closest odd, overflow to max */ float_round_to_odd = 5, + /* Not an IEEE rounding mode: round to closest odd, overflow to inf */ + float_round_to_odd_inf = 6, } FloatRoundMode; /* diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc index a897a5a743..7f69da1d8f 100644 --- a/fpu/softfloat-parts.c.inc +++ b/fpu/softfloat-parts.c.inc @@ -176,13 +176,12 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s, g_assert_not_reached(); } + overflow_norm = false; switch (s->float_rounding_mode) { case float_round_nearest_even: - overflow_norm = false; inc = ((p->frac_lo & roundeven_mask) != frac_lsbm1 ? frac_lsbm1 : 0); break; case float_round_ties_away: - overflow_norm = false; inc = frac_lsbm1; break; case float_round_to_zero: @@ -199,6 +198,8 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s, break; case float_round_to_odd: overflow_norm = true; + /* fall through */ + case float_round_to_odd_inf: inc = p->frac_lo & frac_lsb ? 0 : round_mask; break; default: @@ -259,6 +260,7 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s, ? frac_lsbm1 : 0); break; case float_round_to_odd: + case float_round_to_odd_inf: inc = p->frac_lo & frac_lsb ? 0 : round_mask; break; default: -- 2.25.1