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.
45 lines
1.1 KiB
45 lines
1.1 KiB
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include "platform.h"
|
|
#include "internals.h"
|
|
#include "softfloat.h"
|
|
|
|
uint_fast64_t f64_to_ui64_r_minMag( float64_t a, bool exact )
|
|
{
|
|
union ui64_f64 uA;
|
|
uint_fast64_t uiA;
|
|
int_fast16_t exp;
|
|
uint_fast64_t sig;
|
|
int_fast16_t shiftCount;
|
|
uint_fast64_t z;
|
|
|
|
uA.f = a;
|
|
uiA = uA.ui;
|
|
exp = expF64UI( uiA );
|
|
sig = fracF64UI( uiA );
|
|
if ( exp < 0x3FF ) {
|
|
if ( exact && ( exp | sig ) ) {
|
|
softfloat_raiseFlags( softfloat_flag_inexact );
|
|
}
|
|
return 0;
|
|
}
|
|
if ( signF64UI( uiA ) ) goto invalid;
|
|
shiftCount = exp - 0x433;
|
|
if ( 0 <= shiftCount ) {
|
|
if ( 0x43E < exp ) goto invalid;
|
|
z = ( sig | UINT64_C( 0x0010000000000000 ) )<<shiftCount;
|
|
} else {
|
|
sig |= UINT64_C( 0x0010000000000000 );
|
|
z = sig>>( - shiftCount );
|
|
if ( exact && (uint64_t) ( sig<<( shiftCount & 63 ) ) ) {
|
|
softfloat_raiseFlags( softfloat_flag_inexact );
|
|
}
|
|
}
|
|
return z;
|
|
invalid:
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
|
return UINT64_C( 0xFFFFFFFFFFFFFFFF );
|
|
|
|
}
|
|
|
|
|