433 lines
17 KiB
C
433 lines
17 KiB
C
/*============================================================================
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This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
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Package, Release 2b.
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Written by John R. Hauser. This work was made possible in part by the
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International Computer Science Institute, located at Suite 600, 1947 Center
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Street, Berkeley, California 94704. Funding was partially provided by the
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National Science Foundation under grant MIP-9311980. The original version
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of this code was written as part of a project to build a fixed-point vector
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processor in collaboration with the University of California at Berkeley,
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overseen by Profs. Nelson Morgan and John Wawrzynek. More information
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is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
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arithmetic/SoftFloat.html'.
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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 TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
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COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
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EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
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INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
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OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
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Derivative works are acceptable, even for commercial purposes, so long as
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(1) the source code for the derivative work includes prominent notice that
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the work is derivative, and (2) the source code includes prominent notice with
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these four paragraphs for those parts of this code that are retained.
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=============================================================================*/
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/*============================================================================
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* Adapted for Bochs (x86 achitecture simulator) by
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* Stanislav Shwartsman [sshwarts at sourceforge net]
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* ==========================================================================*/
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#include <config.h> /* generated by configure script from config.h.in */
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#ifndef _SOFTFLOAT_H_
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#define _SOFTFLOAT_H_
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#define FLOAT16
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#define FLOATX80
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point types.
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*----------------------------------------------------------------------------*/
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#ifdef FLOAT16
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typedef Bit16u float16;
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#endif
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typedef Bit32u float32;
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typedef Bit64u float64;
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point class.
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*----------------------------------------------------------------------------*/
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typedef enum {
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float_zero,
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float_NaN,
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float_negative_inf,
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float_positive_inf,
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float_denormal,
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float_normalized
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} float_class_t;
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point NaN operands handling mode.
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*----------------------------------------------------------------------------*/
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enum float_nan_handling_mode_t {
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float_larger_significand_nan = 0, // this mode used by x87 FPU
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float_first_operand_nan = 1 // this mode used by SSE
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};
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point rounding mode.
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*----------------------------------------------------------------------------*/
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enum float_round_t {
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float_round_nearest_even = 0,
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float_round_down = 1,
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float_round_up = 2,
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float_round_to_zero = 3
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};
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point exception flags.
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*----------------------------------------------------------------------------*/
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enum float_exception_flag_t {
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float_flag_invalid = 0x01,
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float_flag_denormal = 0x02,
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float_flag_divbyzero = 0x04,
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float_flag_overflow = 0x08,
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float_flag_underflow = 0x10,
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float_flag_inexact = 0x20
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};
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const unsigned float_all_exceptions_mask = 0x3f;
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#ifdef FLOATX80
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#define RAISE_SW_C1 0x0200
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#endif
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point ordering relations
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*----------------------------------------------------------------------------*/
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enum {
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float_relation_less = -1,
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float_relation_equal = 0,
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float_relation_greater = 1,
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float_relation_unordered = 2
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};
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/*----------------------------------------------------------------------------
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| Options to indicate which negations to perform in float*_muladd()
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| Using these differs from negating an input or output before calling
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| the muladd function in that this means that a NaN doesn't have its
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| sign bit inverted before it is propagated.
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*----------------------------------------------------------------------------*/
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enum {
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float_muladd_negate_c = 1,
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float_muladd_negate_product = 2,
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float_muladd_negate_result = float_muladd_negate_c | float_muladd_negate_product
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};
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point status structure.
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*----------------------------------------------------------------------------*/
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struct float_status_t
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{
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#ifdef FLOATX80
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int float_rounding_precision; /* floatx80 only */
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#endif
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int float_rounding_mode;
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int float_exception_flags;
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int float_exception_masks;
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int float_nan_handling_mode; /* flag register */
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int flush_underflow_to_zero; /* flag register */
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int denormals_are_zeros; /* flag register */
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};
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/*----------------------------------------------------------------------------
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| Routine to raise any or all of the software IEC/IEEE floating-point
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| exception flags.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE void float_raise(float_status_t &status, int flags)
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{
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status.float_exception_flags |= flags;
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}
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/*----------------------------------------------------------------------------
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| Routine to check if any or all of the software IEC/IEEE floating-point
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| exceptions are masked.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE int float_exception_masked(const float_status_t &status, int flag)
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{
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return status.float_exception_masks & flag;
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}
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/*----------------------------------------------------------------------------
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| Returns current floating point rounding mode specified by status word.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE int get_float_rounding_mode(const float_status_t &status)
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{
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return status.float_rounding_mode;
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}
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/*----------------------------------------------------------------------------
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| Returns current floating point precision (floatx80 only).
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*----------------------------------------------------------------------------*/
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#ifdef FLOATX80
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BX_CPP_INLINE int get_float_rounding_precision(const float_status_t &status)
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{
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return status.float_rounding_precision;
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}
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#endif
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/*----------------------------------------------------------------------------
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| Returns current floating point NaN operands handling mode specified
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| by status word.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE int get_float_nan_handling_mode(const float_status_t &status)
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{
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return status.float_nan_handling_mode;
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}
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/*----------------------------------------------------------------------------
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| Raise floating point precision lost up flag (floatx80 only).
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*----------------------------------------------------------------------------*/
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#ifdef FLOATX80
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BX_CPP_INLINE void set_float_rounding_up(float_status_t &status)
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{
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status.float_exception_flags |= RAISE_SW_C1;
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}
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#endif
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/*----------------------------------------------------------------------------
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| Returns 1 if the <denormals-are-zeros> feature is supported;
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| otherwise returns 0.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE int get_denormals_are_zeros(const float_status_t &status)
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{
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return status.denormals_are_zeros;
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}
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/*----------------------------------------------------------------------------
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| Returns 1 if the <flush-underflow-to-zero> feature is supported;
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| otherwise returns 0.
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*----------------------------------------------------------------------------*/
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BX_CPP_INLINE int get_flush_underflow_to_zero(const float_status_t &status)
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{
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return status.flush_underflow_to_zero;
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}
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE integer-to-floating-point conversion routines.
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*----------------------------------------------------------------------------*/
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float32 int32_to_float32(Bit32s, float_status_t &status);
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float64 int32_to_float64(Bit32s);
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float32 int64_to_float32(Bit64s, float_status_t &status);
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float64 int64_to_float64(Bit64s, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE single-precision conversion routines.
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*----------------------------------------------------------------------------*/
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Bit32s float32_to_int32(float32, float_status_t &status);
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Bit32s float32_to_int32_round_to_zero(float32, float_status_t &status);
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Bit64s float32_to_int64(float32, float_status_t &status);
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Bit64s float32_to_int64_round_to_zero(float32, float_status_t &status);
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Bit64u float32_to_uint64(float32, float_status_t &status);
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float64 float32_to_float64(float32, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE single-precision operations.
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*----------------------------------------------------------------------------*/
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float32 float32_round_to_int(float32, float_status_t &status);
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float32 float32_add(float32, float32, float_status_t &status);
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float32 float32_sub(float32, float32, float_status_t &status);
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float32 float32_mul(float32, float32, float_status_t &status);
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float32 float32_div(float32, float32, float_status_t &status);
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float32 float32_sqrt(float32, float_status_t &status);
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float32 float32_frc(float32, float_status_t &status);
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float32 float32_muladd(float32, float32, float32, int flags, float_status_t &status);
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BX_CPP_INLINE float32 float32_fmadd(float32 a, float32 b, float32 c, float_status_t &status)
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{
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return float32_muladd(a, b, c, 0, status);
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}
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BX_CPP_INLINE float32 float32_fmsub(float32 a, float32 b, float32 c, float_status_t &status)
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{
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return float32_muladd(a, b, c, float_muladd_negate_c, status);
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}
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BX_CPP_INLINE float32 float32_fnmadd(float32 a, float32 b, float32 c, float_status_t &status)
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{
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return float32_muladd(a, b, c, float_muladd_negate_product, status);
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}
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BX_CPP_INLINE float32 float32_fnmsub(float32 a, float32 b, float32 c, float_status_t &status)
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{
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return float32_muladd(a, b, c, float_muladd_negate_result, status);
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}
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int float32_compare(float32, float32, float_status_t &status);
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int float32_compare_quiet(float32, float32, float_status_t &status);
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float_class_t float32_class(float32);
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int float32_is_signaling_nan(float32);
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int float32_is_nan(float32);
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int float32_is_denormal(float32);
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float32 float32_min(float32 a, float32 b, float_status_t &status);
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float32 float32_max(float32 a, float32 b, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE double-precision conversion routines.
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*----------------------------------------------------------------------------*/
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Bit32s float64_to_int32(float64, float_status_t &status);
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Bit32s float64_to_int32_round_to_zero(float64, float_status_t &status);
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Bit64s float64_to_int64(float64, float_status_t &status);
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Bit64s float64_to_int64_round_to_zero(float64, float_status_t &status);
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Bit64u float64_to_uint64(float64, float_status_t &status);
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float32 float64_to_float32(float64, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE double-precision operations.
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*----------------------------------------------------------------------------*/
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float64 float64_round_to_int(float64, float_status_t &status);
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float64 float64_add(float64, float64, float_status_t &status);
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float64 float64_sub(float64, float64, float_status_t &status);
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float64 float64_mul(float64, float64, float_status_t &status);
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float64 float64_div(float64, float64, float_status_t &status);
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float64 float64_sqrt(float64, float_status_t &status);
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float64 float64_frc(float64, float_status_t &status);
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float64 float64_muladd(float64, float64, float64, int flags, float_status_t &status);
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BX_CPP_INLINE float64 float64_fmadd(float64 a, float64 b, float64 c, float_status_t &status)
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{
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return float64_muladd(a, b, c, 0, status);
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}
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BX_CPP_INLINE float64 float64_fmsub(float64 a, float64 b, float64 c, float_status_t &status)
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{
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return float64_muladd(a, b, c, float_muladd_negate_c, status);
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}
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BX_CPP_INLINE float64 float64_fnmadd(float64 a, float64 b, float64 c, float_status_t &status)
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{
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return float64_muladd(a, b, c, float_muladd_negate_product, status);
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}
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BX_CPP_INLINE float64 float64_fnmsub(float64 a, float64 b, float64 c, float_status_t &status)
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{
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return float64_muladd(a, b, c, float_muladd_negate_result, status);
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}
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int float64_compare(float64, float64, float_status_t &status);
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int float64_compare_quiet(float64, float64, float_status_t &status);
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float_class_t float64_class(float64);
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int float64_is_signaling_nan(float64);
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int float64_is_nan(float64);
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int float64_is_denormal(float64);
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float64 float64_min(float64 a, float64 b, float_status_t &status);
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float64 float64_max(float64 a, float64 b, float_status_t &status);
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#ifdef FLOAT16
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float32 float16_to_float32(float16, float_status_t &status);
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float16 float32_to_float16(float32, float_status_t &status);
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float_class_t float16_class(float16);
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int float16_is_signaling_nan(float16);
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int float16_is_nan(float16);
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int float16_is_denormal(float16);
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#endif
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#ifdef FLOATX80
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE floating-point types.
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*----------------------------------------------------------------------------*/
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#ifdef BX_BIG_ENDIAN
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struct floatx80 { // leave alignment to compiler
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Bit16u exp;
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Bit64u fraction;
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};
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#else
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struct floatx80 {
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Bit64u fraction;
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Bit16u exp;
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};
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#endif
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE integer-to-floating-point conversion routines.
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*----------------------------------------------------------------------------*/
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floatx80 int32_to_floatx80(Bit32s);
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floatx80 int64_to_floatx80(Bit64s);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision conversion routines.
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*----------------------------------------------------------------------------*/
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floatx80 float32_to_floatx80(float32, float_status_t &status);
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floatx80 float64_to_floatx80(float64, float_status_t &status);
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Bit32s floatx80_to_int32(floatx80, float_status_t &status);
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Bit32s floatx80_to_int32_round_to_zero(floatx80, float_status_t &status);
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Bit64s floatx80_to_int64(floatx80, float_status_t &status);
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Bit64s floatx80_to_int64_round_to_zero(floatx80, float_status_t &status);
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float32 floatx80_to_float32(floatx80, float_status_t &status);
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float64 floatx80_to_float64(floatx80, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision operations.
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*----------------------------------------------------------------------------*/
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floatx80 floatx80_round_to_int(floatx80, float_status_t &status);
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floatx80 floatx80_add(floatx80, floatx80, float_status_t &status);
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floatx80 floatx80_sub(floatx80, floatx80, float_status_t &status);
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floatx80 floatx80_mul(floatx80, floatx80, float_status_t &status);
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floatx80 floatx80_div(floatx80, floatx80, float_status_t &status);
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floatx80 floatx80_sqrt(floatx80, float_status_t &status);
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float_class_t floatx80_class(floatx80);
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int floatx80_is_signaling_nan(floatx80);
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int floatx80_is_nan(floatx80);
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#endif /* FLOATX80 */
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#ifdef FLOAT128
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#ifdef BX_BIG_ENDIAN
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struct float128 {
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Bit64u hi, lo;
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};
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#else
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struct float128 {
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Bit64u lo, hi;
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};
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#endif
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE quadruple-precision conversion routines.
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*----------------------------------------------------------------------------*/
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float128 floatx80_to_float128(floatx80 a, float_status_t &status);
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floatx80 float128_to_floatx80(float128 a, float_status_t &status);
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float128 int64_to_float128(Bit64s a);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision operations.
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*----------------------------------------------------------------------------*/
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floatx80 floatx80_mul(floatx80 a, float128 b, float_status_t &status);
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE quadruple-precision operations.
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*----------------------------------------------------------------------------*/
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float128 float128_add(float128 a, float128 b, float_status_t &status);
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float128 float128_sub(float128 a, float128 b, float_status_t &status);
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float128 float128_mul(float128 a, float128 b, float_status_t &status);
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float128 float128_div(float128 a, float128 b, float_status_t &status);
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#endif /* FLOAT128 */
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#endif
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