f128_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	f128_to_i32 (float128_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

f128_to_i32()

int_fast32_t f128_to_i32	(	float128_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 44 of file f128_to_i32.c.

{
    union ui128_f128 uA;
    uint_fast64_t uiA64, uiA0;
    bool sign;
    int_fast32_t exp;
    uint_fast64_t sig64, sig0;
    int_fast32_t shiftDist;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA64 = uA.ui.v64;
    uiA0  = uA.ui.v0;
    sign  = signF128UI64( uiA64 );
    exp   = expF128UI64( uiA64 );
    sig64 = fracF128UI64( uiA64 );
    sig0  = uiA0;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
#if (i32_fromNaN != i32_fromPosOverflow) || (i32_fromNaN != i32_fromNegOverflow)
    if ( (exp == 0x7FFF) && (sig64 | sig0) ) {
#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 );
    sig64 |= (sig0 != 0);
    shiftDist = 0x4023 - exp;
    if ( 0 < shiftDist ) sig64 = softfloat_shiftRightJam64( sig64, shiftDist );
    return softfloat_roundToI32( sign, sig64, roundingMode, exact );
 
}

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