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sf: add f16_to_[u]i8 APIs 

Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>
pull/475/head
Chih-Min Chao 6 years ago
parent
21dd7ed0ab
commit
4ece06558c
9 changed files with 136 additions and 6 deletions
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  1. 6
      softfloat/f16_to_i16.c
  2. 57
      softfloat/f16_to_i8.c
  3. 4
      softfloat/f16_to_ui16.c
  4. 54
      softfloat/f16_to_ui8.c
  5. 6
      softfloat/f32_to_i16.c
  6. 4
      softfloat/f32_to_ui16.c
  7. 2
      softfloat/softfloat.h
  8. 2
      softfloat/softfloat.mk.in
  9. 7
      softfloat/specialize.h

6
softfloat/f16_to_i16.c
View File

@ -40,13 +40,15 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
int_fast16_t f16_to_i16( float16_t a, uint_fast8_t roundingMode, bool exact )
{
uint_fast8_t old_flags = softfloat_exceptionFlags;
int_fast32_t sig32 = f16_to_i32(a, roundingMode, exact);
if (sig32 > INT16_MAX) {
softfloat_exceptionFlags |= softfloat_flag_invalid;
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return i16_fromPosOverflow;
} else if (sig32 < INT16_MIN) {
softfloat_exceptionFlags |= softfloat_flag_invalid;
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return i16_fromNegOverflow;
} else {
return sig32;

57
softfloat/f16_to_i8.c
View File

@ -0,0 +1,57 @@
/*============================================================================
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
Package, Release 3d, by John R. Hauser.
Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
University of California. 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 University 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 REGENTS 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 REGENTS 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.
=============================================================================*/
#include <stdint.h>
#include "specialize.h"
#include "softfloat.h"
int_fast8_t f16_to_i8( float16_t a, uint_fast8_t roundingMode, bool exact )
{
uint_fast8_t old_flags = softfloat_exceptionFlags;
int_fast32_t sig32 = f16_to_i32(a, roundingMode, exact);
if (sig32 > INT8_MAX) {
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return i8_fromPosOverflow;
} else if (sig32 < INT8_MIN) {
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return i8_fromNegOverflow;
} else {
return sig32;
}
}

4
softfloat/f16_to_ui16.c
View File

@ -40,10 +40,12 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
uint_fast16_t f16_to_ui16( float16_t a, uint_fast8_t roundingMode, bool exact )
{
uint_fast8_t old_flags = softfloat_exceptionFlags;
uint_fast32_t sig32 = f16_to_ui32(a, roundingMode, exact);
if (sig32 > UINT16_MAX) {
softfloat_exceptionFlags |= softfloat_flag_invalid;
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return ui16_fromPosOverflow;
} else {
return sig32;

54
softfloat/f16_to_ui8.c
View File

@ -0,0 +1,54 @@
/*============================================================================
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
Package, Release 3d, by John R. Hauser.
Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
University of California. 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 University 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 REGENTS 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 REGENTS 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.
=============================================================================*/
#include <stdint.h>
#include "specialize.h"
#include "softfloat.h"
uint_fast8_t f16_to_ui8( float16_t a, uint_fast8_t roundingMode, bool exact )
{
uint_fast8_t old_flags = softfloat_exceptionFlags;
uint_fast32_t sig32 = f16_to_ui32(a, roundingMode, exact);
if (sig32 > UINT8_MAX) {
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return ui8_fromPosOverflow;
} else {
return sig32;
}
}

6
softfloat/f32_to_i16.c
View File

@ -40,13 +40,15 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
int_fast16_t f32_to_i16( float32_t a, uint_fast8_t roundingMode, bool exact )
{
uint_fast8_t old_flags = softfloat_exceptionFlags;
int_fast32_t sig32 = f32_to_i32(a, roundingMode, exact);
if (sig32 > INT16_MAX) {
softfloat_exceptionFlags |= softfloat_flag_invalid;
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return i16_fromPosOverflow;
} else if (sig32 < INT16_MIN) {
softfloat_exceptionFlags |= softfloat_flag_invalid;
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return i16_fromNegOverflow;
} else {
return sig32;

4
softfloat/f32_to_ui16.c
View File

@ -40,10 +40,12 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
uint_fast16_t f32_to_ui16( float32_t a, uint_fast8_t roundingMode, bool exact )
{
uint_fast8_t old_flags = softfloat_exceptionFlags;
uint_fast32_t sig32 = f32_to_ui32(a, roundingMode, exact);
if (sig32 > UINT16_MAX) {
softfloat_exceptionFlags |= softfloat_flag_invalid;
softfloat_exceptionFlags = old_flags | softfloat_flag_invalid;
return ui16_fromPosOverflow;
} else {
return sig32;

2
softfloat/softfloat.h
View File

@ -141,9 +141,11 @@ void i64_to_f128M( int64_t, float128_t * );
/*----------------------------------------------------------------------------
| 16-bit (half-precision) floating-point operations.
*----------------------------------------------------------------------------*/
uint_fast8_t f16_to_ui8( float16_t, uint_fast8_t, bool );
uint_fast16_t f16_to_ui16( float16_t, uint_fast8_t, bool );
uint_fast32_t f16_to_ui32( float16_t, uint_fast8_t, bool );
uint_fast64_t f16_to_ui64( float16_t, uint_fast8_t, bool );
int_fast8_t f16_to_i8( float16_t, uint_fast8_t, bool );
int_fast16_t f16_to_i16( float16_t, uint_fast8_t, bool );
int_fast32_t f16_to_i32( float16_t, uint_fast8_t, bool );
int_fast64_t f16_to_i64( float16_t, uint_fast8_t, bool );

2
softfloat/softfloat.mk.in
View File

@ -56,11 +56,13 @@ softfloat_c_srcs = \
f16_to_f128.c \
f16_to_f32.c \
f16_to_f64.c \
f16_to_i8.c \
f16_to_i16.c \
f16_to_i32.c \
f16_to_i32_r_minMag.c \
f16_to_i64.c \
f16_to_i64_r_minMag.c \
f16_to_ui8.c \
f16_to_ui16.c \
f16_to_ui32.c \
f16_to_ui32_r_minMag.c \

7
softfloat/specialize.h
View File

@ -55,6 +55,13 @@ extern "C" {
| The values to return on conversions to 32-bit integer formats that raise an
| invalid exception.
*----------------------------------------------------------------------------*/
#define ui8_fromPosOverflow 0xFF
#define ui8_fromNegOverflow 0
#define ui8_fromNaN 0xFF
#define i8_fromPosOverflow 0x7F
#define i8_fromNegOverflow (-0x7F - 1)
#define i8_fromNaN 0x7F
#define ui16_fromPosOverflow 0xFFFF
#define ui16_fromNegOverflow 0
#define ui16_fromNaN 0xFFFF

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