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271 lines
10 KiB
C
271 lines
10 KiB
C
// This file was originally part of Berkeley Softfloat. It has been modified for use in iSH.
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/*============================================================================
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This C header file template is part of the Berkeley SoftFloat IEEE Floating-
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Point Arithmetic Package, Release 2c, by John R. Hauser.
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THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
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been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
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RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
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AND ORGANIZATIONS WHO CAN AND WILL TOLERATE ALL LOSSES, COSTS, OR OTHER
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PROBLEMS THEY INCUR DUE TO THE SOFTWARE WITHOUT RECOMPENSE FROM JOHN HAUSER OR
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THE INTERNATIONAL COMPUTER SCIENCE INSTITUTE, AND WHO FURTHERMORE EFFECTIVELY
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INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE INSTITUTE
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(possibly via similar legal notice) AGAINST ALL LOSSES, COSTS, OR OTHER
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PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE, OR
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INCURRED BY ANYONE DUE TO A DERIVATIVE WORK THEY CREATE USING ANY PART OF THE
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SOFTWARE.
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Derivative works require also that (1) the source code for the derivative work
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includes prominent notice that the work is derivative, and (2) the source code
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includes prominent notice of these three paragraphs for those parts of this
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code that are retained.
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=============================================================================*/
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#ifndef SOFTFLOAT_H
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#define SOFTFLOAT_H
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/*----------------------------------------------------------------------------
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| The macro `FLOATX80' must be defined to enable the double-extended-precision
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| floating-point format `floatx80'. If this macro is not defined, the
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| `floatx80' type will not be defined, and none of the functions that either
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| input or output the `floatx80' type will be defined. The same applies to
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| the `FLOAT128' macro and the quadruple-precision format `float128'.
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*----------------------------------------------------------------------------*/
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#define FLOATX80
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#define FLOAT128
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#include <stdint.h>
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#include <stdbool.h>
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#define LIT64( a ) a##LL
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/*----------------------------------------------------------------------------
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| Software IEEE floating-point types.
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*----------------------------------------------------------------------------*/
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typedef uint32_t float32;
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typedef uint64_t float64;
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#ifdef FLOATX80
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typedef struct {
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uint16_t signExp;
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uint64_t signif;
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} floatx80;
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#endif
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#ifdef FLOAT128
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typedef struct {
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uint64_t signExp, signif;
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} float128;
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#endif
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/*----------------------------------------------------------------------------
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| Software IEEE floating-point underflow tininess-detection mode.
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*----------------------------------------------------------------------------*/
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extern int8_t float_detect_tininess;
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enum {
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float_tininess_after_rounding = 0,
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float_tininess_before_rounding = 1
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};
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/*----------------------------------------------------------------------------
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| Software IEEE floating-point rounding mode.
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*----------------------------------------------------------------------------*/
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extern int8_t float_rounding_mode;
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enum {
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float_round_nearest_even = 0,
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float_round_to_zero = 1,
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float_round_down = 2,
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float_round_up = 3
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};
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/*----------------------------------------------------------------------------
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| Software IEEE floating-point exception flags.
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*----------------------------------------------------------------------------*/
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extern int8_t float_exception_flags;
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enum {
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float_flag_inexact = 1,
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float_flag_underflow = 2,
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float_flag_overflow = 4,
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float_flag_divbyzero = 8,
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float_flag_invalid = 16
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};
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/*----------------------------------------------------------------------------
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| Routine to raise any or all of the software IEEE floating-point exception
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| flags.
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*----------------------------------------------------------------------------*/
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void float_raise( int8_t );
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/*----------------------------------------------------------------------------
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| Software IEEE integer-to-floating-point conversion routines.
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*----------------------------------------------------------------------------*/
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float32 int32_to_float32( int32_t );
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float64 int32_to_float64( int32_t );
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#ifdef FLOATX80
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floatx80 int32_to_floatx80( int32_t );
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#endif
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#ifdef FLOAT128
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float128 int32_to_float128( int32_t );
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#endif
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float32 int64_to_float32( int64_t );
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float64 int64_to_float64( int64_t );
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#ifdef FLOATX80
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floatx80 int64_to_floatx80( int64_t );
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#endif
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#ifdef FLOAT128
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float128 int64_to_float128( int64_t );
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#endif
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/*----------------------------------------------------------------------------
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| Software IEEE single-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int32_t float32_to_int32( float32 );
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int32_t float32_to_int32_round_to_zero( float32 );
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int64_t float32_to_int64( float32 );
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int64_t float32_to_int64_round_to_zero( float32 );
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float64 float32_to_float64( float32 );
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#ifdef FLOATX80
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floatx80 float32_to_floatx80( float32 );
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#endif
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#ifdef FLOAT128
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float128 float32_to_float128( float32 );
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#endif
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/*----------------------------------------------------------------------------
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| Software IEEE single-precision operations.
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*----------------------------------------------------------------------------*/
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float32 float32_round_to_int( float32 );
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float32 float32_add( float32, float32 );
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float32 float32_sub( float32, float32 );
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float32 float32_mul( float32, float32 );
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float32 float32_div( float32, float32 );
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float32 float32_rem( float32, float32 );
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float32 float32_sqrt( float32 );
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bool float32_eq( float32, float32 );
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bool float32_le( float32, float32 );
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bool float32_lt( float32, float32 );
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bool float32_eq_signaling( float32, float32 );
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bool float32_le_quiet( float32, float32 );
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bool float32_lt_quiet( float32, float32 );
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bool float32_is_signaling_nan( float32 );
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/*----------------------------------------------------------------------------
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| Software IEEE double-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int32_t float64_to_int32( float64 );
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int32_t float64_to_int32_round_to_zero( float64 );
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int64_t float64_to_int64( float64 );
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int64_t float64_to_int64_round_to_zero( float64 );
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float32 float64_to_float32( float64 );
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#ifdef FLOATX80
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floatx80 float64_to_floatx80( float64 );
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#endif
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#ifdef FLOAT128
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float128 float64_to_float128( float64 );
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#endif
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/*----------------------------------------------------------------------------
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| Software IEEE double-precision operations.
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*----------------------------------------------------------------------------*/
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float64 float64_round_to_int( float64 );
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float64 float64_add( float64, float64 );
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float64 float64_sub( float64, float64 );
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float64 float64_mul( float64, float64 );
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float64 float64_div( float64, float64 );
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float64 float64_rem( float64, float64 );
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float64 float64_sqrt( float64 );
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bool float64_eq( float64, float64 );
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bool float64_le( float64, float64 );
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bool float64_lt( float64, float64 );
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bool float64_eq_signaling( float64, float64 );
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bool float64_le_quiet( float64, float64 );
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bool float64_lt_quiet( float64, float64 );
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bool float64_is_signaling_nan( float64 );
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#ifdef FLOATX80
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/*----------------------------------------------------------------------------
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| Software IEEE double-extended-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int32_t floatx80_to_int32( floatx80 );
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int32_t floatx80_to_int32_round_to_zero( floatx80 );
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int64_t floatx80_to_int64( floatx80 );
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int64_t floatx80_to_int64_round_to_zero( floatx80 );
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float32 floatx80_to_float32( floatx80 );
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float64 floatx80_to_float64( floatx80 );
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#ifdef FLOAT128
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float128 floatx80_to_float128( floatx80 );
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#endif
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static inline void floatx80_neg(floatx80 f) {
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f.signExp ^= 1 << 15; // flip the sign bit
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}
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static inline void floatx80_abs(floatx80 f) {
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f.signExp &= ~(1 << 15); // clear the sign bit
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}
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/*----------------------------------------------------------------------------
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| Software IEEE double-extended-precision rounding precision. Valid values
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| are 32, 64, and 80.
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*----------------------------------------------------------------------------*/
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extern int8_t floatx80_rounding_precision;
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/*----------------------------------------------------------------------------
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| Software IEEE double-extended-precision operations.
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*----------------------------------------------------------------------------*/
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floatx80 floatx80_round_to_int( floatx80 );
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floatx80 floatx80_add( floatx80, floatx80 );
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floatx80 floatx80_sub( floatx80, floatx80 );
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floatx80 floatx80_mul( floatx80, floatx80 );
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floatx80 floatx80_div( floatx80, floatx80 );
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floatx80 floatx80_rem( floatx80, floatx80 );
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floatx80 floatx80_sqrt( floatx80 );
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bool floatx80_eq( floatx80, floatx80 );
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bool floatx80_le( floatx80, floatx80 );
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bool floatx80_lt( floatx80, floatx80 );
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bool floatx80_eq_signaling( floatx80, floatx80 );
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bool floatx80_le_quiet( floatx80, floatx80 );
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bool floatx80_lt_quiet( floatx80, floatx80 );
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bool floatx80_is_signaling_nan( floatx80 );
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#endif
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#ifdef FLOAT128
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/*----------------------------------------------------------------------------
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| Software IEEE quadruple-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int32_t float128_to_int32( float128 );
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int32_t float128_to_int32_round_to_zero( float128 );
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int64_t float128_to_int64( float128 );
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int64_t float128_to_int64_round_to_zero( float128 );
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float32 float128_to_float32( float128 );
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float64 float128_to_float64( float128 );
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#ifdef FLOATX80
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floatx80 float128_to_floatx80( float128 );
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#endif
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/*----------------------------------------------------------------------------
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| Software IEEE quadruple-precision operations.
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*----------------------------------------------------------------------------*/
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float128 float128_round_to_int( float128 );
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float128 float128_add( float128, float128 );
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float128 float128_sub( float128, float128 );
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float128 float128_mul( float128, float128 );
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float128 float128_div( float128, float128 );
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float128 float128_rem( float128, float128 );
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float128 float128_sqrt( float128 );
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bool float128_eq( float128, float128 );
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bool float128_le( float128, float128 );
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bool float128_lt( float128, float128 );
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bool float128_eq_signaling( float128, float128 );
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bool float128_le_quiet( float128, float128 );
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bool float128_lt_quiet( float128, float128 );
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bool float128_is_signaling_nan( float128 );
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#endif
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#endif
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