blob: 9afebd74ecff9187baf19824c3d0a9c4787798bc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
#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 );
}
|