f128M_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	f128M_to_i64_r_minMag (const float128_t *aPtr, bool exact)

Function Documentation

f128M_to_i64_r_minMag()

int_fast64_t f128M_to_i64_r_minMag	(	const float128_t *	aPtr,
		bool	exact )

Definition at line 55 of file f128M_to_i64_r_minMag.c.

{
    const uint32_t *aWPtr;
    uint32_t uiA96;
    bool sign;
    int32_t exp;
    uint32_t sig96;
    int32_t shiftDist;
    uint32_t sig[4];
    uint64_t uiZ;
    union { uint64_t ui; int64_t i; } uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    aWPtr = (const uint32_t *) aPtr;
    uiA96 = aWPtr[indexWordHi( 4 )];
    sign  = signF128UI96( uiA96 );
    exp   = expF128UI96( uiA96 );
    sig96 = fracF128UI96( uiA96 );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0x403E - exp;
    if ( shiftDist < 0 ) goto invalid;
    if ( exact ) {
        if ( exp ) sig96 |= 0x00010000;
        sig[indexWord( 4, 3 )] = sig96;
        sig[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )];
        sig[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )];
        sig[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )];
        softfloat_shiftRightJam128M( sig, shiftDist + 17, sig );
        uiZ = (uint64_t) sig[indexWord( 4, 2 )]<<32 | sig[indexWord( 4, 1 )];
        if ( uiZ>>63 && (! sign || (uiZ != UINT64_C( 0x8000000000000000 ))) ) {
            goto invalid;
        }
        if ( sig[indexWordLo( 4 )] ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
    } else {
        if ( 64 <= shiftDist ) return 0;
        uiZ =
              (uint64_t) sig96<<47
            | (uint64_t) aWPtr[indexWord( 4, 2 )]<<15
            | aWPtr[indexWord( 4, 1 )]>>17;
        if ( shiftDist ) {
            uiZ |= UINT64_C( 0x8000000000000000 );
            uiZ >>= shiftDist;
        } else {
            if ( uiZ || ! sign ) goto invalid;
            uiZ |= UINT64_C( 0x8000000000000000 );
        }
    }
    if ( sign ) uiZ = -uiZ;
    uZ.ui = uiZ;
    return uZ.i;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_raiseFlags( softfloat_flag_invalid );
    return
        (exp == 0x7FFF)
            && (sig96
                    || (aWPtr[indexWord( 4, 2 )] | aWPtr[indexWord( 4, 1 )]
                            | aWPtr[indexWord( 4, 0 )]))
            ? i64_fromNaN
            : sign ? i64_fromNegOverflow : i64_fromPosOverflow;
 
}

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