diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/fpu/softfloat-types.h | 179 | ||||
| -rw-r--r-- | include/fpu/softfloat.h | 202 | ||||
| -rw-r--r-- | include/qemu/bswap.h | 2 |
3 files changed, 248 insertions, 135 deletions
diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h new file mode 100644 index 0000000000..4e378cb612 --- /dev/null +++ b/include/fpu/softfloat-types.h @@ -0,0 +1,179 @@ +/* + * QEMU float support + * + * The code in this source file is derived from release 2a of the SoftFloat + * IEC/IEEE Floating-point Arithmetic Package. Those parts of the code (and + * some later contributions) are provided under that license, as detailed below. + * It has subsequently been modified by contributors to the QEMU Project, + * so some portions are provided under: + * the SoftFloat-2a license + * the BSD license + * GPL-v2-or-later + * + * This header holds definitions for code that might be dealing with + * softfloat types but not need access to the actual library functions. + */ +/* +=============================================================================== +This C header file is part of the SoftFloat IEC/IEEE Floating-point +Arithmetic Package, Release 2a. + +Written by John R. Hauser. This work was made possible in part by the +International Computer Science Institute, located at Suite 600, 1947 Center +Street, Berkeley, California 94704. Funding was partially provided by the +National Science Foundation under grant MIP-9311980. The original version +of this code was written as part of a project to build a fixed-point vector +processor in collaboration with the University of California at Berkeley, +overseen by Profs. Nelson Morgan and John Wawrzynek. More information +is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ +arithmetic/SoftFloat.html'. + +THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort +has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT +TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO +PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY +AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. + +Derivative works are acceptable, even for commercial purposes, so long as +(1) they include prominent notice that the work is derivative, and (2) they +include prominent notice akin to these four paragraphs for those parts of +this code that are retained. + +=============================================================================== +*/ + +/* BSD licensing: + * Copyright (c) 2006, Fabrice Bellard + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * 3. Neither the name of the copyright holder nor the names of its contributors + * may be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* Portions of this work are licensed under the terms of the GNU GPL, + * version 2 or later. See the COPYING file in the top-level directory. + */ + +#ifndef SOFTFLOAT_TYPES_H +#define SOFTFLOAT_TYPES_H + +/* This 'flag' type must be able to hold at least 0 and 1. It should + * probably be replaced with 'bool' but the uses would need to be audited + * to check that they weren't accidentally relying on it being a larger type. + */ +typedef uint8_t flag; + +/* + * Software IEC/IEEE floating-point types. + */ + +typedef uint16_t float16; +typedef uint32_t float32; +typedef uint64_t float64; +#define float16_val(x) (x) +#define float32_val(x) (x) +#define float64_val(x) (x) +#define make_float16(x) (x) +#define make_float32(x) (x) +#define make_float64(x) (x) +#define const_float16(x) (x) +#define const_float32(x) (x) +#define const_float64(x) (x) +typedef struct { + uint64_t low; + uint16_t high; +} floatx80; +#define make_floatx80(exp, mant) ((floatx80) { mant, exp }) +#define make_floatx80_init(exp, mant) { .low = mant, .high = exp } +typedef struct { +#ifdef HOST_WORDS_BIGENDIAN + uint64_t high, low; +#else + uint64_t low, high; +#endif +} float128; +#define make_float128(high_, low_) ((float128) { .high = high_, .low = low_ }) +#define make_float128_init(high_, low_) { .high = high_, .low = low_ } + +/* + * Software IEC/IEEE floating-point underflow tininess-detection mode. + */ + +enum { + float_tininess_after_rounding = 0, + float_tininess_before_rounding = 1 +}; + +/* + *Software IEC/IEEE floating-point rounding mode. + */ + +enum { + float_round_nearest_even = 0, + float_round_down = 1, + float_round_up = 2, + float_round_to_zero = 3, + float_round_ties_away = 4, + /* Not an IEEE rounding mode: round to the closest odd mantissa value */ + float_round_to_odd = 5, +}; + +/* + * Software IEC/IEEE floating-point exception flags. + */ + +enum { + float_flag_invalid = 1, + float_flag_divbyzero = 4, + float_flag_overflow = 8, + float_flag_underflow = 16, + float_flag_inexact = 32, + float_flag_input_denormal = 64, + float_flag_output_denormal = 128 +}; + + +/* + * Floating Point Status. Individual architectures may maintain + * several versions of float_status for different functions. The + * correct status for the operation is then passed by reference to + * most of the softfloat functions. + */ + +typedef struct float_status { + signed char float_detect_tininess; + signed char float_rounding_mode; + uint8_t float_exception_flags; + signed char floatx80_rounding_precision; + /* should denormalised results go to zero and set the inexact flag? */ + flag flush_to_zero; + /* should denormalised inputs go to zero and set the input_denormal flag? */ + flag flush_inputs_to_zero; + flag default_nan_mode; + flag snan_bit_is_one; +} float_status; + +#endif /* SOFTFLOAT_TYPES_H */ diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 0f96a0edd1..9b7b5e34e2 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -82,12 +82,6 @@ this code that are retained. #ifndef SOFTFLOAT_H #define SOFTFLOAT_H -/* This 'flag' type must be able to hold at least 0 and 1. It should - * probably be replaced with 'bool' but the uses would need to be audited - * to check that they weren't accidentally relying on it being a larger type. - */ -typedef uint8_t flag; - #define LIT64( a ) a##LL /*---------------------------------------------------------------------------- @@ -100,110 +94,7 @@ enum { float_relation_unordered = 2 }; -/*---------------------------------------------------------------------------- -| Software IEC/IEEE floating-point types. -*----------------------------------------------------------------------------*/ -/* Use structures for soft-float types. This prevents accidentally mixing - them with native int/float types. A sufficiently clever compiler and - sane ABI should be able to see though these structs. However - x86/gcc 3.x seems to struggle a bit, so leave them disabled by default. */ -//#define USE_SOFTFLOAT_STRUCT_TYPES -#ifdef USE_SOFTFLOAT_STRUCT_TYPES -typedef struct { - uint16_t v; -} float16; -#define float16_val(x) (((float16)(x)).v) -#define make_float16(x) __extension__ ({ float16 f16_val = {x}; f16_val; }) -#define const_float16(x) { x } -typedef struct { - uint32_t v; -} float32; -/* The cast ensures an error if the wrong type is passed. */ -#define float32_val(x) (((float32)(x)).v) -#define make_float32(x) __extension__ ({ float32 f32_val = {x}; f32_val; }) -#define const_float32(x) { x } -typedef struct { - uint64_t v; -} float64; -#define float64_val(x) (((float64)(x)).v) -#define make_float64(x) __extension__ ({ float64 f64_val = {x}; f64_val; }) -#define const_float64(x) { x } -#else -typedef uint16_t float16; -typedef uint32_t float32; -typedef uint64_t float64; -#define float16_val(x) (x) -#define float32_val(x) (x) -#define float64_val(x) (x) -#define make_float16(x) (x) -#define make_float32(x) (x) -#define make_float64(x) (x) -#define const_float16(x) (x) -#define const_float32(x) (x) -#define const_float64(x) (x) -#endif -typedef struct { - uint64_t low; - uint16_t high; -} floatx80; -#define make_floatx80(exp, mant) ((floatx80) { mant, exp }) -#define make_floatx80_init(exp, mant) { .low = mant, .high = exp } -typedef struct { -#ifdef HOST_WORDS_BIGENDIAN - uint64_t high, low; -#else - uint64_t low, high; -#endif -} float128; -#define make_float128(high_, low_) ((float128) { .high = high_, .low = low_ }) -#define make_float128_init(high_, low_) { .high = high_, .low = low_ } - -/*---------------------------------------------------------------------------- -| Software IEC/IEEE floating-point underflow tininess-detection mode. -*----------------------------------------------------------------------------*/ -enum { - float_tininess_after_rounding = 0, - float_tininess_before_rounding = 1 -}; - -/*---------------------------------------------------------------------------- -| Software IEC/IEEE floating-point rounding mode. -*----------------------------------------------------------------------------*/ -enum { - float_round_nearest_even = 0, - float_round_down = 1, - float_round_up = 2, - float_round_to_zero = 3, - float_round_ties_away = 4, - /* Not an IEEE rounding mode: round to the closest odd mantissa value */ - float_round_to_odd = 5, -}; - -/*---------------------------------------------------------------------------- -| Software IEC/IEEE floating-point exception flags. -*----------------------------------------------------------------------------*/ -enum { - float_flag_invalid = 1, - float_flag_divbyzero = 4, - float_flag_overflow = 8, - float_flag_underflow = 16, - float_flag_inexact = 32, - float_flag_input_denormal = 64, - float_flag_output_denormal = 128 -}; - -typedef struct float_status { - signed char float_detect_tininess; - signed char float_rounding_mode; - uint8_t float_exception_flags; - signed char floatx80_rounding_precision; - /* should denormalised results go to zero and set the inexact flag? */ - flag flush_to_zero; - /* should denormalised inputs go to zero and set the input_denormal flag? */ - flag flush_inputs_to_zero; - flag default_nan_mode; - flag snan_bit_is_one; -} float_status; +#include "fpu/softfloat-types.h" static inline void set_float_detect_tininess(int val, float_status *status) { @@ -277,6 +168,7 @@ 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); @@ -298,9 +190,13 @@ enum { /*---------------------------------------------------------------------------- | Software IEC/IEEE integer-to-floating-point conversion routines. *----------------------------------------------------------------------------*/ +float32 int16_to_float32(int16_t, float_status *status); float32 int32_to_float32(int32_t, float_status *status); +float64 int16_to_float64(int16_t, float_status *status); float64 int32_to_float64(int32_t, float_status *status); +float32 uint16_to_float32(uint16_t, float_status *status); float32 uint32_to_float32(uint32_t, float_status *status); +float64 uint16_to_float64(uint16_t, float_status *status); float64 uint32_to_float64(uint32_t, float_status *status); floatx80 int32_to_floatx80(int32_t, float_status *status); float128 int32_to_float128(int32_t, float_status *status); @@ -312,27 +208,6 @@ float32 uint64_to_float32(uint64_t, float_status *status); float64 uint64_to_float64(uint64_t, float_status *status); float128 uint64_to_float128(uint64_t, float_status *status); -/* We provide the int16 versions for symmetry of API with float-to-int */ -static inline float32 int16_to_float32(int16_t v, float_status *status) -{ - return int32_to_float32(v, status); -} - -static inline float32 uint16_to_float32(uint16_t v, float_status *status) -{ - return uint32_to_float32(v, status); -} - -static inline float64 int16_to_float64(int16_t v, float_status *status) -{ - return int32_to_float64(v, status); -} - -static inline float64 uint16_to_float64(uint16_t v, float_status *status) -{ - return uint32_to_float64(v, status); -} - /*---------------------------------------------------------------------------- | Software half-precision conversion routines. *----------------------------------------------------------------------------*/ @@ -340,10 +215,46 @@ float16 float32_to_float16(float32, flag, float_status *status); float32 float16_to_float32(float16, flag, float_status *status); float16 float64_to_float16(float64 a, flag ieee, float_status *status); float64 float16_to_float64(float16 a, flag ieee, float_status *status); +int16_t float16_to_int16(float16, float_status *status); +uint16_t float16_to_uint16(float16 a, float_status *status); +int16_t float16_to_int16_round_to_zero(float16, float_status *status); +uint16_t float16_to_uint16_round_to_zero(float16 a, float_status *status); +int32_t float16_to_int32(float16, float_status *status); +uint32_t float16_to_uint32(float16 a, float_status *status); +int32_t float16_to_int32_round_to_zero(float16, float_status *status); +uint32_t float16_to_uint32_round_to_zero(float16 a, float_status *status); +int64_t float16_to_int64(float16, float_status *status); +uint64_t float16_to_uint64(float16 a, float_status *status); +int64_t float16_to_int64_round_to_zero(float16, float_status *status); +uint64_t float16_to_uint64_round_to_zero(float16 a, float_status *status); +float16 int16_to_float16(int16_t a, float_status *status); +float16 int32_to_float16(int32_t a, float_status *status); +float16 int64_to_float16(int64_t a, float_status *status); +float16 uint16_to_float16(uint16_t a, float_status *status); +float16 uint32_to_float16(uint32_t a, float_status *status); +float16 uint64_to_float16(uint64_t a, float_status *status); /*---------------------------------------------------------------------------- | Software half-precision operations. *----------------------------------------------------------------------------*/ + +float16 float16_round_to_int(float16, float_status *status); +float16 float16_add(float16, float16, float_status *status); +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); +float16 float16_min(float16, float16, float_status *status); +float16 float16_max(float16, float16, float_status *status); +float16 float16_minnum(float16, float16, float_status *status); +float16 float16_maxnum(float16, float16, float_status *status); +float16 float16_minnummag(float16, float16, float_status *status); +float16 float16_maxnummag(float16, float16, float_status *status); +float16 float16_sqrt(float16, float_status *status); +int float16_compare(float16, float16, float_status *status); +int float16_compare_quiet(float16, float16, float_status *status); + int float16_is_quiet_nan(float16, float_status *status); int float16_is_signaling_nan(float16, float_status *status); float16 float16_maybe_silence_nan(float16, float_status *status); @@ -373,6 +284,32 @@ static inline int float16_is_zero_or_denormal(float16 a) return (float16_val(a) & 0x7c00) == 0; } +static inline float16 float16_abs(float16 a) +{ + /* Note that abs does *not* handle NaN specially, nor does + * it flush denormal inputs to zero. + */ + return make_float16(float16_val(a) & 0x7fff); +} + +static inline float16 float16_chs(float16 a) +{ + /* Note that chs does *not* handle NaN specially, nor does + * it flush denormal inputs to zero. + */ + return make_float16(float16_val(a) ^ 0x8000); +} + +static inline float16 float16_set_sign(float16 a, int sign) +{ + return make_float16((float16_val(a) & 0x7fff) | (sign << 15)); +} + +#define float16_zero make_float16(0) +#define float16_one make_float16(0x3c00) +#define float16_half make_float16(0x3800) +#define float16_infinity make_float16(0x7c00) + /*---------------------------------------------------------------------------- | The pattern for a default generated half-precision NaN. *----------------------------------------------------------------------------*/ @@ -479,8 +416,6 @@ static inline float32 float32_set_sign(float32 a, int sign) #define float32_zero make_float32(0) #define float32_one make_float32(0x3f800000) -#define float32_ln2 make_float32(0x3f317218) -#define float32_pi make_float32(0x40490fdb) #define float32_half make_float32(0x3f000000) #define float32_infinity make_float32(0x7f800000) @@ -593,7 +528,6 @@ static inline float64 float64_set_sign(float64 a, int sign) #define float64_zero make_float64(0) #define float64_one make_float64(0x3ff0000000000000LL) #define float64_ln2 make_float64(0x3fe62e42fefa39efLL) -#define float64_pi make_float64(0x400921fb54442d18LL) #define float64_half make_float64(0x3fe0000000000000LL) #define float64_infinity make_float64(0x7ff0000000000000LL) diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h index 09c78fd28a..3f28f661b1 100644 --- a/include/qemu/bswap.h +++ b/include/qemu/bswap.h @@ -1,7 +1,7 @@ #ifndef BSWAP_H #define BSWAP_H -#include "fpu/softfloat.h" +#include "fpu/softfloat-types.h" #ifdef CONFIG_MACHINE_BSWAP_H # include <sys/endian.h> |