ui64_to_f128.c File Reference

#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "softfloat.h"

Include dependency graph for ui64_to_f128.c:

Go to the source code of this file.

Functions
float128_t	ui64_to_f128 (uint64_t a)

Function Documentation

ui64_to_f128()

float128_t ui64_to_f128

(

uint64_t

a

)

Definition at line 42 of file ui64_to_f128.c.

{
    uint_fast64_t uiZ64, uiZ0;
    int_fast8_t shiftDist;
    struct uint128 zSig;
    union ui128_f128 uZ;
 
    if ( ! a ) {
        uiZ64 = 0;
        uiZ0  = 0;
    } else {
        shiftDist = softfloat_countLeadingZeros64( a ) + 49;
        if ( 64 <= shiftDist ) {
            zSig.v64 = a<<(shiftDist - 64);
            zSig.v0  = 0;
        } else {
            zSig = softfloat_shortShiftLeft128( 0, a, shiftDist );
        }
        uiZ64 = packToF128UI64( 0, 0x406E - shiftDist, zSig.v64 );
        uiZ0  = zSig.v0;
    }
    uZ.ui.v64 = uiZ64;
    uZ.ui.v0  = uiZ0;
    return uZ.f;
 
}