You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1004 B
44 lines
1004 B
15 years ago
|
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
#include "platform.h"
|
||
|
|
#include "primitives.h"
|
||
|
|
#include "internals.h"
|
||
|
|
#include "specialize.h"
|
||
|
|
#include "softfloat.h"
|
||
|
|
|
||
|
|
float32_t f64_to_f32( float64_t a )
|
||
|
|
{
|
||
|
|
union ui64_f64 uA;
|
||
|
|
uint_fast64_t uiA;
|
||
|
|
bool sign;
|
||
|
|
int_fast16_t exp;
|
||
|
|
uint_fast64_t sig;
|
||
|
|
uint_fast32_t uiZ, sig32;
|
||
|
|
union ui32_f32 uZ;
|
||
|
|
|
||
|
|
uA.f = a;
|
||
|
|
uiA = uA.ui;
|
||
|
|
sign = signF64UI( uiA );
|
||
|
|
exp = expF64UI( uiA );
|
||
|
|
sig = fracF64UI( uiA );
|
||
|
|
if ( exp == 0x7FF ) {
|
||
|
|
uiZ =
|
||
|
|
sig ? softfloat_commonNaNToF32UI(
|
||
|
|
softfloat_f64UIToCommonNaN( uiA ) )
|
||
|
|
: packToF32UI( sign, 0xFF, 0 );
|
||
|
|
goto uiZ;
|
||
|
|
}
|
||
|
|
sig32 = softfloat_shortShift64RightJam( sig, 22 );
|
||
|
|
if ( ! ( exp | sig32 ) ) {
|
||
|
|
uiZ = packToF32UI( sign, 0, 0 );
|
||
|
|
goto uiZ;
|
||
|
|
}
|
||
|
|
return softfloat_roundPackToF32( sign, exp - 0x381, sig32 | 0x40000000 );
|
||
|
|
uiZ:
|
||
|
|
uZ.ui = uiZ;
|
||
|
|
return uZ.f;
|
||
|
|
|
||
|
|
}
|
||
|
|
|