1b2b0af50d
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1842 c046a42c-6fe2-441c-8c8c-71466251a162
364 lines
7.8 KiB
C
364 lines
7.8 KiB
C
/* Native implementation of soft float functions. Only a single status
|
|
context is supported */
|
|
#include "softfloat.h"
|
|
#include <math.h>
|
|
|
|
void set_float_rounding_mode(int val STATUS_PARAM)
|
|
{
|
|
STATUS(float_rounding_mode) = val;
|
|
#if defined(_BSD) && !defined(__APPLE__)
|
|
fpsetround(val);
|
|
#elif defined(__arm__)
|
|
/* nothing to do */
|
|
#else
|
|
fesetround(val);
|
|
#endif
|
|
}
|
|
|
|
#ifdef FLOATX80
|
|
void set_floatx80_rounding_precision(int val STATUS_PARAM)
|
|
{
|
|
STATUS(floatx80_rounding_precision) = val;
|
|
}
|
|
#endif
|
|
|
|
#if defined(_BSD)
|
|
#define lrint(d) ((long)rint(d))
|
|
#define llrint(d) ((long long)rint(d))
|
|
#endif
|
|
|
|
#if defined(__powerpc__)
|
|
|
|
/* correct (but slow) PowerPC rint() (glibc version is incorrect) */
|
|
double qemu_rint(double x)
|
|
{
|
|
double y = 4503599627370496.0;
|
|
if (fabs(x) >= y)
|
|
return x;
|
|
if (x < 0)
|
|
y = -y;
|
|
y = (x + y) - y;
|
|
if (y == 0.0)
|
|
y = copysign(y, x);
|
|
return y;
|
|
}
|
|
|
|
#define rint qemu_rint
|
|
#endif
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE integer-to-floating-point conversion routines.
|
|
*----------------------------------------------------------------------------*/
|
|
float32 int32_to_float32(int v STATUS_PARAM)
|
|
{
|
|
return (float32)v;
|
|
}
|
|
|
|
float64 int32_to_float64(int v STATUS_PARAM)
|
|
{
|
|
return (float64)v;
|
|
}
|
|
|
|
#ifdef FLOATX80
|
|
floatx80 int32_to_floatx80(int v STATUS_PARAM)
|
|
{
|
|
return (floatx80)v;
|
|
}
|
|
#endif
|
|
float32 int64_to_float32( int64_t v STATUS_PARAM)
|
|
{
|
|
return (float32)v;
|
|
}
|
|
float64 int64_to_float64( int64_t v STATUS_PARAM)
|
|
{
|
|
return (float64)v;
|
|
}
|
|
#ifdef FLOATX80
|
|
floatx80 int64_to_floatx80( int64_t v STATUS_PARAM)
|
|
{
|
|
return (floatx80)v;
|
|
}
|
|
#endif
|
|
|
|
/* XXX: this code implements the x86 behaviour, not the IEEE one. */
|
|
#if HOST_LONG_BITS == 32
|
|
static inline int long_to_int32(long a)
|
|
{
|
|
return a;
|
|
}
|
|
#else
|
|
static inline int long_to_int32(long a)
|
|
{
|
|
if (a != (int32_t)a)
|
|
a = 0x80000000;
|
|
return a;
|
|
}
|
|
#endif
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE single-precision conversion routines.
|
|
*----------------------------------------------------------------------------*/
|
|
int float32_to_int32( float32 a STATUS_PARAM)
|
|
{
|
|
return long_to_int32(lrintf(a));
|
|
}
|
|
int float32_to_int32_round_to_zero( float32 a STATUS_PARAM)
|
|
{
|
|
return (int)a;
|
|
}
|
|
int64_t float32_to_int64( float32 a STATUS_PARAM)
|
|
{
|
|
return llrintf(a);
|
|
}
|
|
|
|
int64_t float32_to_int64_round_to_zero( float32 a STATUS_PARAM)
|
|
{
|
|
return (int64_t)a;
|
|
}
|
|
|
|
float64 float32_to_float64( float32 a STATUS_PARAM)
|
|
{
|
|
return a;
|
|
}
|
|
#ifdef FLOATX80
|
|
floatx80 float32_to_floatx80( float32 a STATUS_PARAM)
|
|
{
|
|
return a;
|
|
}
|
|
#endif
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE single-precision operations.
|
|
*----------------------------------------------------------------------------*/
|
|
float32 float32_round_to_int( float32 a STATUS_PARAM)
|
|
{
|
|
return rintf(a);
|
|
}
|
|
|
|
float32 float32_rem( float32 a, float32 b STATUS_PARAM)
|
|
{
|
|
return remainderf(a, b);
|
|
}
|
|
|
|
float32 float32_sqrt( float32 a STATUS_PARAM)
|
|
{
|
|
return sqrtf(a);
|
|
}
|
|
char float32_compare( float32 a, float32 b STATUS_PARAM )
|
|
{
|
|
if (a < b) {
|
|
return -1;
|
|
} else if (a == b) {
|
|
return 0;
|
|
} else if (a > b) {
|
|
return 1;
|
|
} else {
|
|
return 2;
|
|
}
|
|
}
|
|
char float32_compare_quiet( float32 a, float32 b STATUS_PARAM )
|
|
{
|
|
if (isless(a, b)) {
|
|
return -1;
|
|
} else if (a == b) {
|
|
return 0;
|
|
} else if (isgreater(a, b)) {
|
|
return 1;
|
|
} else {
|
|
return 2;
|
|
}
|
|
}
|
|
char float32_is_signaling_nan( float32 a1)
|
|
{
|
|
float32u u;
|
|
uint32_t a;
|
|
u.f = a1;
|
|
a = u.i;
|
|
return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE double-precision conversion routines.
|
|
*----------------------------------------------------------------------------*/
|
|
int float64_to_int32( float64 a STATUS_PARAM)
|
|
{
|
|
return long_to_int32(lrint(a));
|
|
}
|
|
int float64_to_int32_round_to_zero( float64 a STATUS_PARAM)
|
|
{
|
|
return (int)a;
|
|
}
|
|
int64_t float64_to_int64( float64 a STATUS_PARAM)
|
|
{
|
|
return llrint(a);
|
|
}
|
|
int64_t float64_to_int64_round_to_zero( float64 a STATUS_PARAM)
|
|
{
|
|
return (int64_t)a;
|
|
}
|
|
float32 float64_to_float32( float64 a STATUS_PARAM)
|
|
{
|
|
return a;
|
|
}
|
|
#ifdef FLOATX80
|
|
floatx80 float64_to_floatx80( float64 a STATUS_PARAM)
|
|
{
|
|
return a;
|
|
}
|
|
#endif
|
|
#ifdef FLOAT128
|
|
float128 float64_to_float128( float64 a STATUS_PARAM)
|
|
{
|
|
return a;
|
|
}
|
|
#endif
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE double-precision operations.
|
|
*----------------------------------------------------------------------------*/
|
|
float64 float64_round_to_int( float64 a STATUS_PARAM )
|
|
{
|
|
#if defined(__arm__)
|
|
switch(STATUS(float_rounding_mode)) {
|
|
default:
|
|
case float_round_nearest_even:
|
|
asm("rndd %0, %1" : "=f" (a) : "f"(a));
|
|
break;
|
|
case float_round_down:
|
|
asm("rnddm %0, %1" : "=f" (a) : "f"(a));
|
|
break;
|
|
case float_round_up:
|
|
asm("rnddp %0, %1" : "=f" (a) : "f"(a));
|
|
break;
|
|
case float_round_to_zero:
|
|
asm("rnddz %0, %1" : "=f" (a) : "f"(a));
|
|
break;
|
|
}
|
|
#else
|
|
return rint(a);
|
|
#endif
|
|
}
|
|
|
|
float64 float64_rem( float64 a, float64 b STATUS_PARAM)
|
|
{
|
|
return remainder(a, b);
|
|
}
|
|
|
|
float64 float64_sqrt( float64 a STATUS_PARAM)
|
|
{
|
|
return sqrt(a);
|
|
}
|
|
char float64_compare( float64 a, float64 b STATUS_PARAM )
|
|
{
|
|
if (a < b) {
|
|
return -1;
|
|
} else if (a == b) {
|
|
return 0;
|
|
} else if (a > b) {
|
|
return 1;
|
|
} else {
|
|
return 2;
|
|
}
|
|
}
|
|
char float64_compare_quiet( float64 a, float64 b STATUS_PARAM )
|
|
{
|
|
if (isless(a, b)) {
|
|
return -1;
|
|
} else if (a == b) {
|
|
return 0;
|
|
} else if (isgreater(a, b)) {
|
|
return 1;
|
|
} else {
|
|
return 2;
|
|
}
|
|
}
|
|
char float64_is_signaling_nan( float64 a1)
|
|
{
|
|
float64u u;
|
|
uint64_t a;
|
|
u.f = a1;
|
|
a = u.i;
|
|
return
|
|
( ( ( a>>51 ) & 0xFFF ) == 0xFFE )
|
|
&& ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
|
|
|
|
}
|
|
|
|
#ifdef FLOATX80
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE extended double-precision conversion routines.
|
|
*----------------------------------------------------------------------------*/
|
|
int floatx80_to_int32( floatx80 a STATUS_PARAM)
|
|
{
|
|
return long_to_int32(lrintl(a));
|
|
}
|
|
int floatx80_to_int32_round_to_zero( floatx80 a STATUS_PARAM)
|
|
{
|
|
return (int)a;
|
|
}
|
|
int64_t floatx80_to_int64( floatx80 a STATUS_PARAM)
|
|
{
|
|
return llrintl(a);
|
|
}
|
|
int64_t floatx80_to_int64_round_to_zero( floatx80 a STATUS_PARAM)
|
|
{
|
|
return (int64_t)a;
|
|
}
|
|
float32 floatx80_to_float32( floatx80 a STATUS_PARAM)
|
|
{
|
|
return a;
|
|
}
|
|
float64 floatx80_to_float64( floatx80 a STATUS_PARAM)
|
|
{
|
|
return a;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Software IEC/IEEE extended double-precision operations.
|
|
*----------------------------------------------------------------------------*/
|
|
floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM)
|
|
{
|
|
return rintl(a);
|
|
}
|
|
floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM)
|
|
{
|
|
return remainderl(a, b);
|
|
}
|
|
floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM)
|
|
{
|
|
return sqrtl(a);
|
|
}
|
|
char floatx80_compare( floatx80 a, floatx80 b STATUS_PARAM )
|
|
{
|
|
if (a < b) {
|
|
return -1;
|
|
} else if (a == b) {
|
|
return 0;
|
|
} else if (a > b) {
|
|
return 1;
|
|
} else {
|
|
return 2;
|
|
}
|
|
}
|
|
char floatx80_compare_quiet( floatx80 a, floatx80 b STATUS_PARAM )
|
|
{
|
|
if (isless(a, b)) {
|
|
return -1;
|
|
} else if (a == b) {
|
|
return 0;
|
|
} else if (isgreater(a, b)) {
|
|
return 1;
|
|
} else {
|
|
return 2;
|
|
}
|
|
}
|
|
char floatx80_is_signaling_nan( floatx80 a1)
|
|
{
|
|
floatx80u u;
|
|
u.f = a1;
|
|
return ( ( u.i.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( u.i.low<<1 );
|
|
}
|
|
|
|
#endif
|