f128M_to_i32_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_fast32_t	f128M_to_i32_r_minMag (const float128_t *aPtr, bool exact)

Function Documentation

f128M_to_i32_r_minMag()

int_fast32_t f128M_to_i32_r_minMag	(	const float128_t *	aPtr,
		bool	exact )

Definition at line 55 of file f128M_to_i32_r_minMag.c.

{
    const uint32_t *aWPtr;
    uint32_t uiA96;
    bool sign;
    int32_t exp;
    uint64_t sig64;
    int32_t shiftDist;
    uint32_t absZ, uiZ;
    union { uint32_t ui; int32_t i; } uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    aWPtr = (const uint32_t *) aPtr;
    uiA96 = aWPtr[indexWordHi( 4 )];
    sign = signF128UI96( uiA96 );
    exp  = expF128UI96( uiA96 );
    sig64 = (uint64_t) fracF128UI96( uiA96 )<<32 | aWPtr[indexWord( 4, 2 )];
    if ( aWPtr[indexWord( 4, 1 )] | aWPtr[indexWord( 4, 0 )] ) sig64 |= 1;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp < 0x3FFF ) {
        if ( exact && (exp | sig64) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
        return 0;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( 0x401F <= exp ) goto invalid;
    shiftDist = 0x402F - exp;
    sig64 |= UINT64_C( 0x0001000000000000 );
    absZ = sig64>>shiftDist;
    uiZ = sign ? -absZ : absZ;
    if ( uiZ>>31 != sign ) goto invalid;
    if ( exact && ((uint64_t) absZ<<shiftDist != sig64) ) {
        softfloat_exceptionFlags |= softfloat_flag_inexact;
    }
    uZ.ui = uiZ;
    return uZ.i;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_raiseFlags( softfloat_flag_invalid );
    return
        (exp == 0x7FFF) && sig64 ? i32_fromNaN
            : sign ? i32_fromNegOverflow : i32_fromPosOverflow;
 
}

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