From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51644) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eONe8-0002So-3i for qemu-devel@nongnu.org; Mon, 11 Dec 2017 07:57:25 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eONe7-0007nb-1y for qemu-devel@nongnu.org; Mon, 11 Dec 2017 07:57:24 -0500 Received: from mail-wm0-x243.google.com ([2a00:1450:400c:c09::243]:46918) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eONe6-0007mV-Oj for qemu-devel@nongnu.org; Mon, 11 Dec 2017 07:57:22 -0500 Received: by mail-wm0-x243.google.com with SMTP id r78so14298667wme.5 for ; Mon, 11 Dec 2017 04:57:22 -0800 (PST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Mon, 11 Dec 2017 12:57:03 +0000 Message-Id: <20171211125705.16120-18-alex.bennee@linaro.org> In-Reply-To: <20171211125705.16120-1-alex.bennee@linaro.org> References: <20171211125705.16120-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PATCH v1 17/19] fpu/softfloat: re-factor scalbn List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: richard.henderson@linaro.org, peter.maydell@linaro.org, laurent@vivier.eu, bharata@linux.vnet.ibm.com, andrew@andrewdutcher.com, aleksandar.markovic@imgtec.com Cc: qemu-devel@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Aurelien Jarno This is one of the simpler manipulations you could make to a floating point number. Signed-off-by: Alex Bennée --- fpu/softfloat.c | 104 +++++++++++++++--------------------------------- include/fpu/softfloat.h | 1 + 2 files changed, 32 insertions(+), 73 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 1a7f1cab10..b7ea56dfa5 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -1662,6 +1662,37 @@ float64 uint16_to_float64(uint16_t a, float_status *status) return uint64_to_float64((uint64_t) a, status); } +/* Multiply A by 2 raised to the power N. */ +static decomposed_parts scalbn_decomposed(decomposed_parts a, int n, + float_status *s) +{ + if (a.cls == float_class_normal) { + a.exp += n; + } + return a; +} + +float16 float16_scalbn(float16 a, int n, float_status *status) +{ + decomposed_parts pa = float16_unpack_canonical(a, status); + decomposed_parts pr = scalbn_decomposed(pa, n, status); + return float16_round_pack_canonical(pr, status); +} + +float32 float32_scalbn(float32 a, int n, float_status *status) +{ + decomposed_parts pa = float32_unpack_canonical(a, status); + decomposed_parts pr = scalbn_decomposed(pa, n, status); + return float32_round_pack_canonical(pr, status); +} + +float64 float64_scalbn(float64 a, int n, float_status *status) +{ + decomposed_parts pa = float64_unpack_canonical(a, status); + decomposed_parts pr = scalbn_decomposed(pa, n, status); + return float64_round_pack_canonical(pr, status); +} + /*---------------------------------------------------------------------------- | Takes a 64-bit fixed-point value `absZ' with binary point between bits 6 | and 7, and returns the properly rounded 32-bit integer corresponding to the @@ -6991,79 +7022,6 @@ MINMAX(32) MINMAX(64) -/* Multiply A by 2 raised to the power N. */ -float32 float32_scalbn(float32 a, int n, float_status *status) -{ - flag aSign; - int16_t aExp; - uint32_t aSig; - - a = float32_squash_input_denormal(a, status); - aSig = extractFloat32Frac( a ); - aExp = extractFloat32Exp( a ); - aSign = extractFloat32Sign( a ); - - if ( aExp == 0xFF ) { - if ( aSig ) { - return propagateFloat32NaN(a, a, status); - } - return a; - } - if (aExp != 0) { - aSig |= 0x00800000; - } else if (aSig == 0) { - return a; - } else { - aExp++; - } - - if (n > 0x200) { - n = 0x200; - } else if (n < -0x200) { - n = -0x200; - } - - aExp += n - 1; - aSig <<= 7; - return normalizeRoundAndPackFloat32(aSign, aExp, aSig, status); -} - -float64 float64_scalbn(float64 a, int n, float_status *status) -{ - flag aSign; - int16_t aExp; - uint64_t aSig; - - a = float64_squash_input_denormal(a, status); - aSig = extractFloat64Frac( a ); - aExp = extractFloat64Exp( a ); - aSign = extractFloat64Sign( a ); - - if ( aExp == 0x7FF ) { - if ( aSig ) { - return propagateFloat64NaN(a, a, status); - } - return a; - } - if (aExp != 0) { - aSig |= LIT64( 0x0010000000000000 ); - } else if (aSig == 0) { - return a; - } else { - aExp++; - } - - if (n > 0x1000) { - n = 0x1000; - } else if (n < -0x1000) { - n = -0x1000; - } - - aExp += n - 1; - aSig <<= 10; - return normalizeRoundAndPackFloat64(aSign, aExp, aSig, status); -} - floatx80 floatx80_scalbn(floatx80 a, int n, float_status *status) { flag aSign; diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 8ebde83251..c1224aab8c 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -353,6 +353,7 @@ float16 float16_sub(float16, float16, float_status *status); float16 float16_mul(float16, float16, float_status *status); float16 float16_muladd(float16, float16, float16, int, float_status *status); float16 float16_div(float16, float16, float_status *status); +float16 float16_scalbn(float16, int, float_status *status); int float16_is_quiet_nan(float16, float_status *status); int float16_is_signaling_nan(float16, float_status *status); -- 2.15.1