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.
41 lines
1.1 KiB
41 lines
1.1 KiB
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include "platform.h"
|
|
#include "primitives.h"
|
|
#include "internals.h"
|
|
#include "softfloat.h"
|
|
|
|
uint_fast64_t f64_to_ui64( float64_t a, int_fast8_t roundingMode, bool exact )
|
|
{
|
|
union ui64_f64 uA;
|
|
uint_fast64_t uiA;
|
|
bool sign;
|
|
int_fast16_t exp;
|
|
uint_fast64_t sig;
|
|
int_fast16_t shiftCount;
|
|
struct uint64_extra sigExtra;
|
|
|
|
uA.f = a;
|
|
uiA = uA.ui;
|
|
sign = signF64UI( uiA );
|
|
exp = expF64UI( uiA );
|
|
sig = fracF64UI( uiA );
|
|
if ( exp ) sig |= UINT64_C( 0x0010000000000000 );
|
|
shiftCount = 0x433 - exp;
|
|
if ( shiftCount <= 0 ) {
|
|
if ( 0x43E < exp ) {
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
|
return UINT64_C( 0xFFFFFFFFFFFFFFFF );
|
|
}
|
|
sigExtra.v = sig<<( - shiftCount );
|
|
sigExtra.extra = 0;
|
|
} else {
|
|
sigExtra = softfloat_shift64ExtraRightJam( sig, 0, shiftCount );
|
|
}
|
|
return
|
|
softfloat_roundPackToUI64(
|
|
sign, sigExtra.v, sigExtra.extra, roundingMode, exact );
|
|
|
|
}
|
|
|
|
|