From 5308333e789e19956172d4e77e7ae4cf2fb4eafb Mon Sep 17 00:00:00 2001 From: =?utf8?q?Samuel=20Iglesias=20Gons=C3=A1lvez?= Date: Thu, 6 Sep 2018 16:01:34 +0200 Subject: [PATCH] util: add fp64 -> fp32 conversion support for RTNE and RTZ rounding modes MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit In order to be coherent with the pre-existent API for half floats, this new API for double is the one meant to be used when doing double to float conversions. It is no more than a wrapper for the softfloat.h API but we meant to keep that one private. v2: - Fix bug in _mesa_double_to_float_rtz() in the inf/nan detection using the exponent value. v3: - Replace custom f64 -> f32 implementations with the softfloat one (Andres). v4: - Added API usage clarifying comments (Caio). Signed-off-by: Samuel Iglesias Gonsálvez Signed-off-by: Andres Gomez Reviewed-by: Caio Marcelo de Oliveira Filho --- src/util/Makefile.sources | 2 ++ src/util/double.c | 38 ++++++++++++++++++++++++++++ src/util/double.h | 53 +++++++++++++++++++++++++++++++++++++++ src/util/meson.build | 2 ++ 4 files changed, 95 insertions(+) create mode 100644 src/util/double.c create mode 100644 src/util/double.h diff --git a/src/util/Makefile.sources b/src/util/Makefile.sources index e4d9d73ce8a..cf8c848ea6d 100644 --- a/src/util/Makefile.sources +++ b/src/util/Makefile.sources @@ -15,6 +15,8 @@ MESA_UTIL_FILES := \ debug.h \ disk_cache.c \ disk_cache.h \ + double.c \ + double.h \ fast_idiv_by_const.c \ fast_idiv_by_const.h \ format_r11g11b10f.h \ diff --git a/src/util/double.c b/src/util/double.c new file mode 100644 index 00000000000..ea86e9c45d9 --- /dev/null +++ b/src/util/double.c @@ -0,0 +1,38 @@ +/* + * Mesa 3-D graphics library + * + * Copyright (C) 2018-2019 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#include "softfloat.h" +#include "double.h" + +float +_mesa_double_to_float(double val) +{ + return _mesa_double_to_f32(val, false); +} + +float +_mesa_double_to_float_rtz(double val) +{ + return _mesa_double_to_f32(val, true); +} diff --git a/src/util/double.h b/src/util/double.h new file mode 100644 index 00000000000..784aa3076ee --- /dev/null +++ b/src/util/double.h @@ -0,0 +1,53 @@ +/* + * Mesa 3-D graphics library + * + * Copyright (C) 2018-2019 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#ifndef _DOUBLE_H_ +#define _DOUBLE_H_ + + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * This API is no more than a wrapper to the counterpart softfloat.h + * calls. Still, softfloat.h conversion API is meant to be kept private. In + * other words, only use the API published here, instead of calling directly + * the softfloat.h one. + */ + +float _mesa_double_to_float(double val); +float _mesa_double_to_float_rtz(double val); + +static inline float +_mesa_double_to_float_rtne(double val) +{ + return _mesa_double_to_float(val); +} + +#ifdef __cplusplus +} /* extern C */ +#endif + +#endif /* _DOUBLE_H_ */ diff --git a/src/util/meson.build b/src/util/meson.build index 8326691f408..c981a146de1 100644 --- a/src/util/meson.build +++ b/src/util/meson.build @@ -38,6 +38,8 @@ files_mesa_util = files( 'debug.h', 'disk_cache.c', 'disk_cache.h', + 'double.c', + 'double.h', 'fast_idiv_by_const.c', 'fast_idiv_by_const.h', 'format_r11g11b10f.h', -- 2.30.2