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[97.113.2.170]) by smtp.gmail.com with ESMTPSA id k84-v6sm10756406pfh.93.2018.05.11.17.43.21 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 11 May 2018 17:43:21 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Fri, 11 May 2018 17:42:50 -0700 Message-Id: <20180512004311.9299-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180512004311.9299-1-richard.henderson@linaro.org> References: <20180512004311.9299-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400e:c05::242 Subject: [Qemu-devel] [PATCH v2 06/27] fpu/softfloat: Canonicalize NaN fraction 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: peter.maydell@linaro.org, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Shift the NaN fraction to a canonical position, much like we do for the fraction of normal numbers. Immediately, this simplifies the float-to-float conversion. Later, this will facilitate manipulation of NaNs within the shared code paths. Signed-off-by: Richard Henderson --- fpu/softfloat.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 353893aaea..a56d3d975b 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -330,10 +330,11 @@ static FloatParts canonicalize(FloatParts part, const FloatFmt *parm, if (part.frac == 0) { part.cls = float_class_inf; } else { + part.frac <<= parm->frac_shift; #ifdef NO_SIGNALING_NANS part.cls = float_class_qnan; #else - int64_t msb = part.frac << (parm->frac_shift + 2); + int64_t msb = part.frac << 2; if ((msb < 0) == status->snan_bit_is_one) { part.cls = float_class_snan; } else { @@ -480,6 +481,7 @@ static FloatParts round_canonical(FloatParts p, float_status *s, case float_class_qnan: case float_class_snan: exp = exp_max; + frac >>= parm->frac_shift; break; default: @@ -503,6 +505,7 @@ static float16 float16_round_pack_canonical(FloatParts p, float_status *s) case float_class_dnan: return float16_default_nan(s); case float_class_msnan: + p.frac >>= float16_params.frac_shift; return float16_maybe_silence_nan(float16_pack_raw(p), s); default: p = round_canonical(p, s, &float16_params); @@ -521,6 +524,7 @@ static float32 float32_round_pack_canonical(FloatParts p, float_status *s) case float_class_dnan: return float32_default_nan(s); case float_class_msnan: + p.frac >>= float32_params.frac_shift; return float32_maybe_silence_nan(float32_pack_raw(p), s); default: p = round_canonical(p, s, &float32_params); @@ -539,6 +543,7 @@ static float64 float64_round_pack_canonical(FloatParts p, float_status *s) case float_class_dnan: return float64_default_nan(s); case float_class_msnan: + p.frac >>= float64_params.frac_shift; return float64_maybe_silence_nan(float64_pack_raw(p), s); default: p = round_canonical(p, s, &float64_params);