extF80M_to_i64_r_minMag.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	extF80M_to_i64_r_minMag (const extFloat80_t *aPtr, bool exact)

Function Documentation

extF80M_to_i64_r_minMag()

int_fast64_t extF80M_to_i64_r_minMag	(	const extFloat80_t *	aPtr,
		bool	exact )

Definition at line 55 of file extF80M_to_i64_r_minMag.c.

{
    const struct extFloat80M *aSPtr;
    uint_fast16_t uiA64;
    int32_t exp;
    uint64_t sig;
    int32_t shiftDist;
    bool sign, raiseInexact;
    int64_t z;
    uint64_t absZ;
    union { uint64_t ui; int64_t i; } u;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    aSPtr = (const struct extFloat80M *) aPtr;
    uiA64 = aSPtr->signExp;
    exp = expExtF80UI64( uiA64 );
    sig = aSPtr->signif;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( ! sig && (exp != 0x7FFF) ) return 0;
    shiftDist = 0x403E - exp;
    if ( 64 <= shiftDist ) {
        raiseInexact = exact;
        z = 0;
    } else {
        sign = signExtF80UI64( uiA64 );
        raiseInexact = false;
        if ( shiftDist < 0 ) {
            if ( shiftDist <= -63 ) goto invalid;
            shiftDist = -shiftDist;
            absZ = sig<<shiftDist;
            if ( absZ>>shiftDist != sig ) goto invalid;
        } else {
            absZ = sig;
            if ( shiftDist ) absZ >>= shiftDist;
            if ( exact && shiftDist ) raiseInexact = (absZ<<shiftDist != sig);
        }
        if ( sign ) {
            if ( UINT64_C( 0x8000000000000000 ) < absZ ) goto invalid;
            u.ui = -absZ;
            z = u.i;
        } else {
            if ( UINT64_C( 0x8000000000000000 ) <= absZ ) goto invalid;
            z = absZ;
        }
    }
    if ( raiseInexact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
    return z;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_raiseFlags( softfloat_flag_invalid );
    return
        (exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF )) ? i64_fromNaN
            : sign ? i64_fromNegOverflow : i64_fromPosOverflow;
 
}

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