extF80_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	extF80_to_i64_r_minMag (extFloat80_t a, bool exact)

Function Documentation

extF80_to_i64_r_minMag()

int_fast64_t extF80_to_i64_r_minMag	(	extFloat80_t	a,
		bool	exact )

Definition at line 44 of file extF80_to_i64_r_minMag.c.

{
    union { struct extFloat80M s; extFloat80_t f; } uA;
    uint_fast16_t uiA64;
    int_fast32_t exp;
    uint_fast64_t sig;
    int_fast32_t shiftDist;
    bool sign;
    int_fast64_t absZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA64 = uA.s.signExp;
    exp = expExtF80UI64( uiA64 );
    sig = uA.s.signif;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0x403E - exp;
    if ( 64 <= shiftDist ) {
        if ( exact && (exp | sig) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
        return 0;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sign = signExtF80UI64( uiA64 );
    if ( shiftDist <= 0 ) {
        if (
            (uiA64 == packToExtF80UI64( 1, 0x403E ))
                && (sig == UINT64_C( 0x8000000000000000 ))
        ) {
            return -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1;
        }
        softfloat_raiseFlags( softfloat_flag_invalid );
        return
            (exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ))
                ? i64_fromNaN
                : sign ? i64_fromNegOverflow : i64_fromPosOverflow;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    absZ = sig>>shiftDist;
    if ( exact && (uint64_t) (sig<<(-shiftDist & 63)) ) {
        softfloat_exceptionFlags |= softfloat_flag_inexact;
    }
    return sign ? -absZ : absZ;
 
}

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