From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33392) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ej6Pu-0000T7-5b for qemu-devel@nongnu.org; Tue, 06 Feb 2018 11:48:23 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ej6Pq-0004fE-Ol for qemu-devel@nongnu.org; Tue, 06 Feb 2018 11:48:22 -0500 Received: from mail-wr0-x242.google.com ([2a00:1450:400c:c0c::242]:41050) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ej6Pq-0004dQ-IY for qemu-devel@nongnu.org; Tue, 06 Feb 2018 11:48:18 -0500 Received: by mail-wr0-x242.google.com with SMTP id v15so2649510wrb.8 for ; Tue, 06 Feb 2018 08:48:18 -0800 (PST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Tue, 6 Feb 2018 16:47:54 +0000 Message-Id: <20180206164815.10084-2-alex.bennee@linaro.org> In-Reply-To: <20180206164815.10084-1-alex.bennee@linaro.org> References: <20180206164815.10084-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PATCH v4 01/22] fpu/softfloat: implement float16_squash_input_denormal 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 Cc: qemu-devel@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Aurelien Jarno This will be required when expanding the MINMAX() macro for 16 bit/half-precision operations. Signed-off-by: Alex Bennée Reviewed-by: Richard Henderson Reviewed-by: Peter Maydell --- fpu/softfloat.c | 15 +++++++++++++++ include/fpu/softfloat.h | 1 + 2 files changed, 16 insertions(+) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 433c5dad2d..3a4ab1355f 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -3488,6 +3488,21 @@ static float16 roundAndPackFloat16(flag zSign, int zExp, return packFloat16(zSign, zExp, zSig >> 13); } +/*---------------------------------------------------------------------------- +| If `a' is denormal and we are in flush-to-zero mode then set the +| input-denormal exception and return zero. Otherwise just return the value. +*----------------------------------------------------------------------------*/ +float16 float16_squash_input_denormal(float16 a, float_status *status) +{ + if (status->flush_inputs_to_zero) { + if (extractFloat16Exp(a) == 0 && extractFloat16Frac(a) != 0) { + float_raise(float_flag_input_denormal, status); + return make_float16(float16_val(a) & 0x8000); + } + } + return a; +} + static void normalizeFloat16Subnormal(uint32_t aSig, int *zExpPtr, uint32_t *zSigPtr) { diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 0f96a0edd1..d5e99667b6 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -277,6 +277,7 @@ void float_raise(uint8_t flags, float_status *status); | If `a' is denormal and we are in flush-to-zero mode then set the | input-denormal exception and return zero. Otherwise just return the value. *----------------------------------------------------------------------------*/ +float16 float16_squash_input_denormal(float16 a, float_status *status); float32 float32_squash_input_denormal(float32 a, float_status *status); float64 float64_squash_input_denormal(float64 a, float_status *status); -- 2.15.1