f32_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	f32_to_i32 (float32_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

f32_to_i32()

int_fast32_t f32_to_i32	(	float32_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 44 of file f32_to_i32.c.

{
    union ui32_f32 uA;
    uint_fast32_t uiA;
    bool sign;
    int_fast16_t exp;
    uint_fast32_t sig;
    uint_fast64_t sig64;
    int_fast16_t shiftDist;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF32UI( uiA );
    exp  = expF32UI( uiA );
    sig  = fracF32UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
#if (i32_fromNaN != i32_fromPosOverflow) || (i32_fromNaN != i32_fromNegOverflow)
    if ( (exp == 0xFF) && sig ) {
#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 ) sig |= 0x00800000;
    sig64 = (uint_fast64_t) sig<<32;
    shiftDist = 0xAA - exp;
    if ( 0 < shiftDist ) sig64 = softfloat_shiftRightJam64( sig64, shiftDist );
    return softfloat_roundToI32( sign, sig64, roundingMode, exact );
 
}

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