f128M_to_i32.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 (const float128_t *aPtr, uint_fast8_t roundingMode, bool exact)

Function Documentation

f128M_to_i32()

int_fast32_t f128M_to_i32	(	const float128_t *	aPtr,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 57 of file f128M_to_i32.c.

{
    const uint32_t *aWPtr;
    uint32_t uiA96;
    bool sign;
    int32_t exp;
    uint64_t sig64;
    int32_t shiftDist;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    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 (i32_fromNaN != i32_fromPosOverflow) || (i32_fromNaN != i32_fromNegOverflow)
    if ( (exp == 0x7FFF) && sig64 ) {
#if (i32_fromNaN == i32_fromPosOverflow)
        sign = 0;
#elif (i32_fromNaN == i32_fromNegOverflow)
        sign = 1;
#else
        softfloat_raiseFlags( softfloat_flag_invalid );
        return i32_fromNaN;
#endif
    }
#endif
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp ) sig64 |= UINT64_C( 0x0001000000000000 );
    shiftDist = 0x4023 - exp;
    if ( 0 < shiftDist ) sig64 = softfloat_shiftRightJam64( sig64, shiftDist );
    return softfloat_roundToI32( sign, sig64, roundingMode, exact );
 
}

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