f64_to_i64.c File Reference

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

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Functions
int_fast64_t	f64_to_i64 (float64_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

f64_to_i64()

int_fast64_t f64_to_i64	(	float64_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 44 of file f64_to_i64.c.

{
    union ui64_f64 uA;
    uint_fast64_t uiA;
    bool sign;
    int_fast16_t exp;
    uint_fast64_t sig;
    int_fast16_t shiftDist;
#ifdef SOFTFLOAT_FAST_INT64
    struct uint64_extra sigExtra;
#else
    uint32_t extSig[3];
#endif
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF64UI( uiA );
    exp  = expF64UI( uiA );
    sig  = fracF64UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp ) sig |= UINT64_C( 0x0010000000000000 );
    shiftDist = 0x433 - exp;
#ifdef SOFTFLOAT_FAST_INT64
    if ( shiftDist <= 0 ) {
        if ( shiftDist < -11 ) goto invalid;
        sigExtra.v = sig<<-shiftDist;
        sigExtra.extra = 0;
    } else {
        sigExtra = softfloat_shiftRightJam64Extra( sig, 0, shiftDist );
    }
    return
        softfloat_roundToI64(
            sign, sigExtra.v, sigExtra.extra, roundingMode, exact );
#else
    extSig[indexWord( 3, 0 )] = 0;
    if ( shiftDist <= 0 ) {
        if ( shiftDist < -11 ) goto invalid;
        sig <<= -shiftDist;
        extSig[indexWord( 3, 2 )] = sig>>32;
        extSig[indexWord( 3, 1 )] = sig;
    } else {
        extSig[indexWord( 3, 2 )] = sig>>32;
        extSig[indexWord( 3, 1 )] = sig;
        softfloat_shiftRightJam96M( extSig, shiftDist, extSig );
    }
    return softfloat_roundMToI64( sign, extSig, roundingMode, exact );
#endif
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_raiseFlags( softfloat_flag_invalid );
    return
        (exp == 0x7FF) && fracF64UI( uiA ) ? i64_fromNaN
            : sign ? i64_fromNegOverflow : i64_fromPosOverflow;
 
}

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