soft float support

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1332 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 329 insertions, 0 deletions

diff --git a/fpu/softfloat.h b/fpu/softfloat.h
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+/*============================================================================
+
+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.
+
+=============================================================================*/
+
+#ifndef SOFTFLOAT_H
+#define SOFTFLOAT_H
+
+#include <inttypes.h>
+#include "config.h"
+
+/*----------------------------------------------------------------------------
+| Each of the following `typedef's defines the most convenient type that holds
+| integers of at least as many bits as specified.  For example, `uint8' should
+| be the most convenient type that can hold unsigned integers of as many as
+| 8 bits.  The `flag' type must be able to hold either a 0 or 1.  For most
+| implementations of C, `flag', `uint8', and `int8' should all be `typedef'ed
+| to the same as `int'.
+*----------------------------------------------------------------------------*/
+typedef char flag;
+typedef uint8_t uint8;
+typedef int8_t int8;
+typedef int uint16;
+typedef int int16;
+typedef unsigned int uint32;
+typedef signed int int32;
+typedef uint64_t uint64;
+typedef int64_t int64;
+
+/*----------------------------------------------------------------------------
+| Each of the following `typedef's defines a type that holds integers
+| of _exactly_ the number of bits specified.  For instance, for most
+| implementation of C, `bits16' and `sbits16' should be `typedef'ed to
+| `unsigned short int' and `signed short int' (or `short int'), respectively.
+*----------------------------------------------------------------------------*/
+typedef uint8_t bits8;
+typedef int8_t sbits8;
+typedef uint16_t bits16;
+typedef int16_t sbits16;
+typedef uint32_t bits32;
+typedef int32_t sbits32;
+typedef uint64_t bits64;
+typedef int64_t sbits64;
+
+#define LIT64( a ) a##LL
+#define INLINE static inline
+
+/*----------------------------------------------------------------------------
+| The macro `FLOATX80' must be defined to enable the extended double-precision
+| floating-point format `floatx80'.  If this macro is not defined, the
+| `floatx80' type will not be defined, and none of the functions that either
+| input or output the `floatx80' type will be defined.  The same applies to
+| the `FLOAT128' macro and the quadruple-precision format `float128'.
+*----------------------------------------------------------------------------*/
+#ifdef CONFIG_SOFTFLOAT
+/* bit exact soft float support */
+#define FLOATX80
+#define FLOAT128
+#else
+/* native float support */
+#if (defined(__i386__) || defined(__x86_64__)) && !defined(_BSD)
+#define FLOATX80
+#endif
+#endif /* !CONFIG_SOFTFLOAT */
+
+#define STATUS_PARAM , float_status *status
+#define STATUS(field) status->field
+#define STATUS_VAR , status
+
+#ifdef CONFIG_SOFTFLOAT
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE floating-point types.
+*----------------------------------------------------------------------------*/
+typedef uint32_t float32;
+typedef uint64_t float64;
+#ifdef FLOATX80
+typedef struct {
+    uint64_t low;
+    uint16_t high;
+} floatx80;
+#endif
+#ifdef FLOAT128
+typedef struct {
+#ifdef WORDS_BIGENDIAN
+    uint64_t high, low;
+#else
+    uint64_t low, high;
+#endif
+} float128;
+#endif
+
+/*----------------------------------------------------------------------------
+| 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
+};
+
+/*----------------------------------------------------------------------------
+| 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
+};
+
+typedef struct float_status {
+    signed char float_detect_tininess;
+    signed char float_rounding_mode;
+    signed char float_exception_flags;
+#ifdef FLOATX80
+    signed char floatx80_rounding_precision;
+#endif
+} float_status;
+
+void set_float_rounding_mode(int val STATUS_PARAM);
+#ifdef FLOATX80
+void set_floatx80_rounding_precision(int val STATUS_PARAM);
+#endif
+
+/*----------------------------------------------------------------------------
+| Routine to raise any or all of the software IEC/IEEE floating-point
+| exception flags.
+*----------------------------------------------------------------------------*/
+void float_raise( signed char STATUS_PARAM);
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE integer-to-floating-point conversion routines.
+*----------------------------------------------------------------------------*/
+float32 int32_to_float32( int STATUS_PARAM );
+float64 int32_to_float64( int STATUS_PARAM );
+#ifdef FLOATX80
+floatx80 int32_to_floatx80( int STATUS_PARAM );
+#endif
+#ifdef FLOAT128
+float128 int32_to_float128( int STATUS_PARAM );
+#endif
+float32 int64_to_float32( int64_t STATUS_PARAM );
+float64 int64_to_float64( int64_t STATUS_PARAM );
+#ifdef FLOATX80
+floatx80 int64_to_floatx80( int64_t STATUS_PARAM );
+#endif
+#ifdef FLOAT128
+float128 int64_to_float128( int64_t STATUS_PARAM );
+#endif
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE single-precision conversion routines.
+*----------------------------------------------------------------------------*/
+int float32_to_int32( float32 STATUS_PARAM );
+int float32_to_int32_round_to_zero( float32 STATUS_PARAM );
+int64_t float32_to_int64( float32 STATUS_PARAM );
+int64_t float32_to_int64_round_to_zero( float32 STATUS_PARAM );
+float64 float32_to_float64( float32 STATUS_PARAM );
+#ifdef FLOATX80
+floatx80 float32_to_floatx80( float32 STATUS_PARAM );
+#endif
+#ifdef FLOAT128
+float128 float32_to_float128( float32 STATUS_PARAM );
+#endif
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE single-precision operations.
+*----------------------------------------------------------------------------*/
+float32 float32_round_to_int( float32 STATUS_PARAM );
+float32 float32_add( float32, float32 STATUS_PARAM );
+float32 float32_sub( float32, float32 STATUS_PARAM );
+float32 float32_mul( float32, float32 STATUS_PARAM );
+float32 float32_div( float32, float32 STATUS_PARAM );
+float32 float32_rem( float32, float32 STATUS_PARAM );
+float32 float32_sqrt( float32 STATUS_PARAM );
+char float32_eq( float32, float32 STATUS_PARAM );
+char float32_le( float32, float32 STATUS_PARAM );
+char float32_lt( float32, float32 STATUS_PARAM );
+char float32_eq_signaling( float32, float32 STATUS_PARAM );
+char float32_le_quiet( float32, float32 STATUS_PARAM );
+char float32_lt_quiet( float32, float32 STATUS_PARAM );
+char float32_is_signaling_nan( float32 );
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE double-precision conversion routines.
+*----------------------------------------------------------------------------*/
+int float64_to_int32( float64 STATUS_PARAM );
+int float64_to_int32_round_to_zero( float64 STATUS_PARAM );
+int64_t float64_to_int64( float64 STATUS_PARAM );
+int64_t float64_to_int64_round_to_zero( float64 STATUS_PARAM );
+float32 float64_to_float32( float64 STATUS_PARAM );
+#ifdef FLOATX80
+floatx80 float64_to_floatx80( float64 STATUS_PARAM );
+#endif
+#ifdef FLOAT128
+float128 float64_to_float128( float64 STATUS_PARAM );
+#endif
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE double-precision operations.
+*----------------------------------------------------------------------------*/
+float64 float64_round_to_int( float64 STATUS_PARAM );
+float64 float64_add( float64, float64 STATUS_PARAM );
+float64 float64_sub( float64, float64 STATUS_PARAM );
+float64 float64_mul( float64, float64 STATUS_PARAM );
+float64 float64_div( float64, float64 STATUS_PARAM );
+float64 float64_rem( float64, float64 STATUS_PARAM );
+float64 float64_sqrt( float64 STATUS_PARAM );
+char float64_eq( float64, float64 STATUS_PARAM );
+char float64_le( float64, float64 STATUS_PARAM );
+char float64_lt( float64, float64 STATUS_PARAM );
+char float64_eq_signaling( float64, float64 STATUS_PARAM );
+char float64_le_quiet( float64, float64 STATUS_PARAM );
+char float64_lt_quiet( float64, float64 STATUS_PARAM );
+char float64_is_signaling_nan( float64 );
+
+#ifdef FLOATX80
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE extended double-precision conversion routines.
+*----------------------------------------------------------------------------*/
+int floatx80_to_int32( floatx80 STATUS_PARAM );
+int floatx80_to_int32_round_to_zero( floatx80 STATUS_PARAM );
+int64_t floatx80_to_int64( floatx80 STATUS_PARAM );
+int64_t floatx80_to_int64_round_to_zero( floatx80 STATUS_PARAM );
+float32 floatx80_to_float32( floatx80 STATUS_PARAM );
+float64 floatx80_to_float64( floatx80 STATUS_PARAM );
+#ifdef FLOAT128
+float128 floatx80_to_float128( floatx80 STATUS_PARAM );
+#endif
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE extended double-precision operations.
+*----------------------------------------------------------------------------*/
+floatx80 floatx80_round_to_int( floatx80 STATUS_PARAM );
+floatx80 floatx80_add( floatx80, floatx80 STATUS_PARAM );
+floatx80 floatx80_sub( floatx80, floatx80 STATUS_PARAM );
+floatx80 floatx80_mul( floatx80, floatx80 STATUS_PARAM );
+floatx80 floatx80_div( floatx80, floatx80 STATUS_PARAM );
+floatx80 floatx80_rem( floatx80, floatx80 STATUS_PARAM );
+floatx80 floatx80_sqrt( floatx80 STATUS_PARAM );
+char floatx80_eq( floatx80, floatx80 STATUS_PARAM );
+char floatx80_le( floatx80, floatx80 STATUS_PARAM );
+char floatx80_lt( floatx80, floatx80 STATUS_PARAM );
+char floatx80_eq_signaling( floatx80, floatx80 STATUS_PARAM );
+char floatx80_le_quiet( floatx80, floatx80 STATUS_PARAM );
+char floatx80_lt_quiet( floatx80, floatx80 STATUS_PARAM );
+char floatx80_is_signaling_nan( floatx80 );
+
+#endif
+
+#ifdef FLOAT128
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE quadruple-precision conversion routines.
+*----------------------------------------------------------------------------*/
+int float128_to_int32( float128 STATUS_PARAM );
+int float128_to_int32_round_to_zero( float128 STATUS_PARAM );
+int64_t float128_to_int64( float128 STATUS_PARAM );
+int64_t float128_to_int64_round_to_zero( float128 STATUS_PARAM );
+float32 float128_to_float32( float128 STATUS_PARAM );
+float64 float128_to_float64( float128 STATUS_PARAM );
+#ifdef FLOATX80
+floatx80 float128_to_floatx80( float128 STATUS_PARAM );
+#endif
+
+/*----------------------------------------------------------------------------
+| Software IEC/IEEE quadruple-precision operations.
+*----------------------------------------------------------------------------*/
+float128 float128_round_to_int( float128 STATUS_PARAM );
+float128 float128_add( float128, float128 STATUS_PARAM );
+float128 float128_sub( float128, float128 STATUS_PARAM );
+float128 float128_mul( float128, float128 STATUS_PARAM );
+float128 float128_div( float128, float128 STATUS_PARAM );
+float128 float128_rem( float128, float128 STATUS_PARAM );
+float128 float128_sqrt( float128 STATUS_PARAM );
+char float128_eq( float128, float128 STATUS_PARAM );
+char float128_le( float128, float128 STATUS_PARAM );
+char float128_lt( float128, float128 STATUS_PARAM );
+char float128_eq_signaling( float128, float128 STATUS_PARAM );
+char float128_le_quiet( float128, float128 STATUS_PARAM );
+char float128_lt_quiet( float128, float128 STATUS_PARAM );
+char float128_is_signaling_nan( float128 );
+
+#endif
+
+#else /* CONFIG_SOFTFLOAT */
+
+#include "softfloat-native.h"
+
+#endif /* !CONFIG_SOFTFLOAT */
+
+#endif /* !SOFTFLOAT_H */