f32_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	f32_to_i32_r_minMag (float32_t a, bool exact)

Function Documentation

f32_to_i32_r_minMag()

int_fast32_t f32_to_i32_r_minMag	(	float32_t	a,
		bool	exact )

Definition at line 44 of file f32_to_i32_r_minMag.c.

{
    union ui32_f32 uA;
    uint_fast32_t uiA;
    int_fast16_t exp;
    uint_fast32_t sig;
    int_fast16_t shiftDist;
    bool sign;
    int_fast32_t absZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    exp = expF32UI( uiA );
    sig = fracF32UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0x9E - exp;
    if ( 32 <= shiftDist ) {
        if ( exact && (exp | sig) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
        return 0;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sign = signF32UI( uiA );
    if ( shiftDist <= 0 ) {
        if ( uiA == packToF32UI( 1, 0x9E, 0 ) ) return -0x7FFFFFFF - 1;
        softfloat_raiseFlags( softfloat_flag_invalid );
        return
            (exp == 0xFF) && sig ? i32_fromNaN
                : sign ? i32_fromNegOverflow : i32_fromPosOverflow;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sig = (sig | 0x00800000)<<8;
    absZ = sig>>shiftDist;
    if ( exact && ((uint_fast32_t) absZ<<shiftDist != sig) ) {
        softfloat_exceptionFlags |= softfloat_flag_inexact;
    }
    return sign ? -absZ : absZ;
 
}

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