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added abs, chs and compare functions 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1338 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-03-13 18:52:29 +00:00
parent 53cd663792
commit 1d6bda3561
2 changed files with 204 additions and 0 deletions
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135
fpu/softfloat.c
View File

@ -54,6 +54,11 @@ void set_float_rounding_mode(int val STATUS_PARAM)
STATUS(float_rounding_mode) = val;
}
void set_float_exception_flags(int val STATUS_PARAM)
{
STATUS(float_exception_flags) = val;
}
#ifdef FLOATX80
void set_floatx80_rounding_precision(int val STATUS_PARAM)
{
@ -5183,3 +5188,133 @@ flag float128_lt_quiet( float128 a, float128 b STATUS_PARAM )
#endif
/* misc functions */
float32 uint32_to_float32( unsigned int a STATUS_PARAM )
{
return int64_to_float32(a STATUS_VAR);
}
float64 uint32_to_float64( unsigned int a STATUS_PARAM )
{
return int64_to_float64(a STATUS_VAR);
}
unsigned int float32_to_uint32( float32 a STATUS_PARAM )
{
int64_t v;
unsigned int res;
v = float32_to_int64(a STATUS_VAR);
if (v < 0) {
res = 0;
float_raise( float_flag_invalid STATUS_VAR);
} else if (v > 0xffffffff) {
res = 0xffffffff;
float_raise( float_flag_invalid STATUS_VAR);
} else {
res = v;
}
return res;
}
unsigned int float32_to_uint32_round_to_zero( float32 a STATUS_PARAM )
{
int64_t v;
unsigned int res;
v = float32_to_int64_round_to_zero(a STATUS_VAR);
if (v < 0) {
res = 0;
float_raise( float_flag_invalid STATUS_VAR);
} else if (v > 0xffffffff) {
res = 0xffffffff;
float_raise( float_flag_invalid STATUS_VAR);
} else {
res = v;
}
return res;
}
unsigned int float64_to_uint32( float64 a STATUS_PARAM )
{
int64_t v;
unsigned int res;
v = float64_to_int64(a STATUS_VAR);
if (v < 0) {
res = 0;
float_raise( float_flag_invalid STATUS_VAR);
} else if (v > 0xffffffff) {
res = 0xffffffff;
float_raise( float_flag_invalid STATUS_VAR);
} else {
res = v;
}
return res;
}
unsigned int float64_to_uint32_round_to_zero( float64 a STATUS_PARAM )
{
int64_t v;
unsigned int res;
v = float64_to_int64_round_to_zero(a STATUS_VAR);
if (v < 0) {
res = 0;
float_raise( float_flag_invalid STATUS_VAR);
} else if (v > 0xffffffff) {
res = 0xffffffff;
float_raise( float_flag_invalid STATUS_VAR);
} else {
res = v;
}
return res;
}
#define COMPARE(s, nan_exp) \
INLINE char float ## s ## _compare_internal( float ## s a, float ## s b, \
int is_quiet STATUS_PARAM ) \
{ \
flag aSign, bSign; \
\
if (( ( extractFloat ## s ## Exp( a ) == nan_exp ) && \
extractFloat ## s ## Frac( a ) ) || \
( ( extractFloat ## s ## Exp( b ) == nan_exp ) && \
extractFloat ## s ## Frac( b ) )) { \
if (!is_quiet || \
float ## s ## _is_signaling_nan( a ) || \
float ## s ## _is_signaling_nan( b ) ) { \
float_raise( float_flag_invalid STATUS_VAR); \
} \
return float_relation_unordered; \
} \
aSign = extractFloat ## s ## Sign( a ); \
bSign = extractFloat ## s ## Sign( b ); \
if ( aSign != bSign ) { \
if ( (bits ## s) ( ( a | b )<<1 ) == 0 ) { \
/* zero case */ \
return float_relation_equal; \
} else { \
return 1 - (2 * aSign); \
} \
} else { \
if (a == b) { \
return float_relation_equal; \
} else { \
return 1 - 2 * (aSign ^ ( a < b )); \
} \
} \
} \
\
char float ## s ## _compare( float ## s a, float ## s b STATUS_PARAM ) \
{ \
return float ## s ## _compare_internal(a, b, 0 STATUS_VAR); \
} \
\
char float ## s ## _compare_quiet( float ## s a, float ## s b STATUS_PARAM ) \
{ \
return float ## s ## _compare_internal(a, b, 1 STATUS_VAR); \
}
COMPARE(32, 0xff)
COMPARE(64, 0x7ff)

69
fpu/softfloat.h
View File

@ -93,6 +93,16 @@ typedef int64_t sbits64;
#define STATUS(field) status->field
#define STATUS_VAR , status
/*----------------------------------------------------------------------------
| Software IEC/IEEE floating-point ordering relations
*----------------------------------------------------------------------------*/
enum {
float_relation_less = -1,
float_relation_equal = 0,
float_relation_greater = 1,
float_relation_unordered = 2
};
#ifdef CONFIG_SOFTFLOAT
/*----------------------------------------------------------------------------
| Software IEC/IEEE floating-point types.
@ -154,6 +164,11 @@ typedef struct float_status {
} float_status;
void set_float_rounding_mode(int val STATUS_PARAM);
void set_float_exception_flags(int val STATUS_PARAM);
INLINE int get_float_exception_flags(float_status *status)
{
return STATUS(float_exception_flags);
}
#ifdef FLOATX80
void set_floatx80_rounding_precision(int val STATUS_PARAM);
#endif
@ -169,6 +184,8 @@ void float_raise( signed char STATUS_PARAM);
*----------------------------------------------------------------------------*/
float32 int32_to_float32( int STATUS_PARAM );
float64 int32_to_float64( int STATUS_PARAM );
float32 uint32_to_float32( unsigned int STATUS_PARAM );
float64 uint32_to_float64( unsigned int STATUS_PARAM );
#ifdef FLOATX80
floatx80 int32_to_floatx80( int STATUS_PARAM );
#endif
@ -189,6 +206,8 @@ float128 int64_to_float128( int64_t STATUS_PARAM );
*----------------------------------------------------------------------------*/
int float32_to_int32( float32 STATUS_PARAM );
int float32_to_int32_round_to_zero( float32 STATUS_PARAM );
unsigned int float32_to_uint32( float32 STATUS_PARAM );
unsigned int float32_to_uint32_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 );
@ -215,13 +234,27 @@ 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_compare( float32, float32 STATUS_PARAM );
char float32_compare_quiet( float32, float32 STATUS_PARAM );
char float32_is_signaling_nan( float32 );
INLINE float32 float32_abs(float32 a)
{
return a & 0x7fffffff;
}
INLINE float32 float32_chs(float32 a)
{
return a ^ 0x80000000;
}
/*----------------------------------------------------------------------------
| Software IEC/IEEE double-precision conversion routines.
*----------------------------------------------------------------------------*/
int float64_to_int32( float64 STATUS_PARAM );
int float64_to_int32_round_to_zero( float64 STATUS_PARAM );
unsigned int float64_to_uint32( float64 STATUS_PARAM );
unsigned int float64_to_uint32_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 );
@ -248,8 +281,20 @@ 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_compare( float64, float64 STATUS_PARAM );
char float64_compare_quiet( float64, float64 STATUS_PARAM );
char float64_is_signaling_nan( float64 );
INLINE float64 float64_abs(float64 a)
{
return a & 0x7fffffffffffffffLL;
}
INLINE float64 float64_chs(float64 a)
{
return a ^ 0x8000000000000000LL;
}
#ifdef FLOATX80
/*----------------------------------------------------------------------------
@ -283,6 +328,18 @@ char floatx80_le_quiet( floatx80, floatx80 STATUS_PARAM );
char floatx80_lt_quiet( floatx80, floatx80 STATUS_PARAM );
char floatx80_is_signaling_nan( floatx80 );
INLINE floatx80 floatx80_abs(floatx80 a)
{
a.high &= 0x7fff;
return a;
}
INLINE floatx80 floatx80_chs(floatx80 a)
{
a.high ^= 0x8000;
return a;
}
#endif
#ifdef FLOAT128
@ -318,6 +375,18 @@ char float128_le_quiet( float128, float128 STATUS_PARAM );
char float128_lt_quiet( float128, float128 STATUS_PARAM );
char float128_is_signaling_nan( float128 );
INLINE float128 float128_abs(float128 a)
{
a.high &= 0x7fffffffffffffffLL;
return a;
}
INLINE float128 float128_chs(float128 a)
{
a.high ^= 0x8000000000000000LL;
return a;
}
#endif
#else /* CONFIG_SOFTFLOAT */