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added abs, chs and compare functions

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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
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@ -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)