diff options
| -rw-r--r-- | src/gallium/auxiliary/util/u_half.c | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/src/gallium/auxiliary/util/u_half.c b/src/gallium/auxiliary/util/u_half.c index 62d74d4c6f4..525ee7b1ecd 100644 --- a/src/gallium/auxiliary/util/u_half.c +++ b/src/gallium/auxiliary/util/u_half.c @@ -1,7 +1,39 @@ -#include "util/u_half.h" +/* + * Copyright 2010 Luca Barbieri + * + * 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 (including the + * next paragraph) 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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. + * + **************************************************************************/ -/* see www.fox-toolkit.org/ftp/fasthalffloatconversion.pdf +/* The code is a reimplementation of the algorithm in + * www.fox-toolkit.org/ftp/fasthalffloatconversion.pdf * "Fast Half Float Conversions" by Jeroen van der Zijp, Nov 2008 + * + * The table contents have been slightly changed so that the exponent + * bias is now in the exponent table instead of the mantissa table (mostly + * for cosmetic reasons, and because it theoretically allows a variant + * that flushes denormal to zero but uses a mantissa table with 24-bit + * entries). + * + * The tables are also constructed slightly differently. */ /* Note that using a 64K * 4 table is a terrible idea since it will not fit @@ -16,6 +48,9 @@ * Note however that if denormals are never encountered, the L1 cache usage * is only about 4608 bytes anyway. */ + +#include "util/u_half.h" + uint32_t util_half_to_float_mantissa_table[2048]; uint32_t util_half_to_float_exponent_table[64]; uint32_t util_half_to_float_offset_table[64]; |