0cb847f6d3
Fixed bugs in execution of float64 packed instructions (almost all instructions affected)
211 lines
10 KiB
C
Executable File
211 lines
10 KiB
C
Executable File
/*============================================================================
|
|
This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic
|
|
Package, Release 2b.
|
|
|
|
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://www.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 ALL LOSSES,
|
|
COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
|
|
EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
|
|
INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
|
|
OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
|
|
|
|
Derivative works are acceptable, even for commercial purposes, so long as
|
|
(1) the source code for the derivative work includes prominent notice that
|
|
the work is derivative, and (2) the source code includes prominent notice with
|
|
these four paragraphs for those parts of this code that are retained.
|
|
=============================================================================*/
|
|
|
|
/*============================================================================
|
|
* Adapted for Bochs (x86 achitecture simulator) by
|
|
* Stanislav Shwartsman (gate@fidonet.org.il)
|
|
* ==========================================================================*/
|
|
|
|
/*
|
|
* Still to be fixed:
|
|
* -----------------
|
|
* * Denormals support for add/sub/compare/convert operations (implemented)
|
|
* * Flush underflow to zero feature support (implemented)
|
|
* * Floating point reciprocal and sqrt reciprocal operations
|
|
*/
|
|
|
|
#include <config.h> /* generated by configure script from config.h.in */
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE floating-point types.
|
|
*----------------------------------------------------------------------------*/
|
|
typedef Bit32u float32, Float32;
|
|
typedef Bit64u float64, Float64;
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE floating-point class.
|
|
*----------------------------------------------------------------------------*/
|
|
typedef enum {
|
|
float_negative_zero,
|
|
float_positive_zero,
|
|
float_NaN,
|
|
float_negative_inf,
|
|
float_positive_inf,
|
|
float_denormal,
|
|
float_normalized,
|
|
} float_class_t;
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| 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 NaN operands handling mode.
|
|
*----------------------------------------------------------------------------*/
|
|
enum float_nan_handling_mode_t {
|
|
float_larger_significand_nan = 0, // this mode used by x87 FPU
|
|
float_first_operand_nan = 1 // this mode used by SSE
|
|
};
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE floating-point rounding mode.
|
|
*----------------------------------------------------------------------------*/
|
|
enum float_round_t {
|
|
float_round_nearest_even = 0,
|
|
float_round_down = 1,
|
|
float_round_up = 2,
|
|
float_round_to_zero = 3
|
|
};
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE floating-point exception flags.
|
|
*----------------------------------------------------------------------------*/
|
|
enum float_exception_flag_t {
|
|
float_flag_invalid = 0x01,
|
|
float_flag_denormal = 0x02,
|
|
float_flag_divbyzero = 0x04,
|
|
float_flag_overflow = 0x08,
|
|
float_flag_underflow = 0x10,
|
|
float_flag_inexact = 0x20,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE floating-point ordering relations
|
|
*----------------------------------------------------------------------------*/
|
|
enum {
|
|
float_relation_less = -1,
|
|
float_relation_equal = 0,
|
|
float_relation_greater = 1,
|
|
float_relation_unordered = 2,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE floating-point status structure.
|
|
*----------------------------------------------------------------------------*/
|
|
struct float_status_t
|
|
{
|
|
int float_detect_tininess;
|
|
int float_rounding_mode;
|
|
int float_exception_flags;
|
|
int float_nan_handling_mode;
|
|
int flush_underflow_to_zero; /* flag register */
|
|
};
|
|
typedef struct float_status_t softfloat_status_word_t;
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Returns current floating point rounding mode specified by status word
|
|
*----------------------------------------------------------------------------*/
|
|
int get_float_rounding_mode(float_status_t &status);
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Routine to raise any or all of the software IEC/IEEE floating-point
|
|
| exception flags.
|
|
*----------------------------------------------------------------------------*/
|
|
void float_raise(float_status_t &status, int);
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE integer-to-floating-point conversion routines.
|
|
*----------------------------------------------------------------------------*/
|
|
float32 int32_to_float32(Bit32s, float_status_t &status);
|
|
float64 int32_to_float64(Bit32s);
|
|
float32 int64_to_float32(Bit64s, float_status_t &status);
|
|
float64 int64_to_float64(Bit64s, float_status_t &status);
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE single-precision conversion routines.
|
|
*----------------------------------------------------------------------------*/
|
|
Bit32s float32_to_int32(float32, float_status_t &status);
|
|
Bit32s float32_to_int32_round_to_zero(float32, float_status_t &status);
|
|
Bit64s float32_to_int64(float32, float_status_t &status);
|
|
Bit64s float32_to_int64_round_to_zero(float32, float_status_t &status);
|
|
float64 float32_to_float64(float32, float_status_t &status);
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE single-precision operations.
|
|
*----------------------------------------------------------------------------*/
|
|
float32 float32_round_to_int(float32, float_status_t &status);
|
|
float32 float32_add(float32, float32, float_status_t &status);
|
|
float32 float32_sub(float32, float32, float_status_t &status);
|
|
float32 float32_mul(float32, float32, float_status_t &status);
|
|
float32 float32_div(float32, float32, float_status_t &status);
|
|
float32 float32_rem(float32, float32, float_status_t &status);
|
|
float32 float32_sqrt(float32, float_status_t &status);
|
|
|
|
typedef int (*float32_compare_method)(float32, float32, float_status_t &status);
|
|
int float32_eq(float32, float32, float_status_t &status);
|
|
int float32_le(float32, float32, float_status_t &status);
|
|
int float32_lt(float32, float32, float_status_t &status);
|
|
int float32_eq_signaling(float32, float32, float_status_t &status);
|
|
int float32_le_quiet(float32, float32, float_status_t &status);
|
|
int float32_lt_quiet(float32, float32, float_status_t &status);
|
|
int float32_unordered(float32, float32, float_status_t &status);
|
|
int float32_compare(float32, float32, float_status_t &status);
|
|
int float32_compare_quiet(float32, float32, float_status_t &status);
|
|
|
|
float_class_t float32_class(float32);
|
|
int float32_is_signaling_nan(float32);
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE double-precision conversion routines.
|
|
*----------------------------------------------------------------------------*/
|
|
Bit32s float64_to_int32(float64, float_status_t &status);
|
|
Bit32s float64_to_int32_round_to_zero(float64, float_status_t &status);
|
|
Bit64s float64_to_int64(float64, float_status_t &status);
|
|
Bit64s float64_to_int64_round_to_zero(float64, float_status_t &status);
|
|
float32 float64_to_float32(float64, float_status_t &status);
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE double-precision operations.
|
|
*----------------------------------------------------------------------------*/
|
|
float64 float64_round_to_int(float64, float_status_t &status);
|
|
float64 float64_add(float64, float64, float_status_t &status);
|
|
float64 float64_sub(float64, float64, float_status_t &status);
|
|
float64 float64_mul(float64, float64, float_status_t &status);
|
|
float64 float64_div(float64, float64, float_status_t &status);
|
|
float64 float64_rem(float64, float64, float_status_t &status);
|
|
float64 float64_sqrt(float64, float_status_t &status);
|
|
|
|
typedef int (*float64_compare_method)(float64, float64, float_status_t &status);
|
|
int float64_eq(float64, float64, float_status_t &status);
|
|
int float64_le(float64, float64, float_status_t &status);
|
|
int float64_lt(float64, float64, float_status_t &status);
|
|
int float64_eq_signaling(float64, float64, float_status_t &status);
|
|
int float64_le_quiet(float64, float64, float_status_t &status);
|
|
int float64_lt_quiet(float64, float64, float_status_t &status);
|
|
int float64_unordered(float64, float64, float_status_t &status);
|
|
int float64_compare(float64, float64, float_status_t &status);
|
|
int float64_compare_quiet(float64, float64, float_status_t &status);
|
|
|
|
float_class_t float64_class(float64);
|
|
int float64_is_signaling_nan(float64);
|