softfloat/f32_to_i32_r_minMag.c


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#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "softfloat.h"

int_fast32_t f32_to_i32_r_minMag( float32_t a, bool exact )
{
    union ui32_f32 uA;
    uint_fast32_t uiA;
    int_fast16_t exp;
    uint_fast32_t sig;
    bool sign;
    int_fast16_t shiftCount;
    int_fast32_t absZ;

    uA.f = a;
    uiA = uA.ui;
    exp = expF32UI( uiA );
    sig = fracF32UI( uiA );
    if ( exp < 0x7F ) {
        if ( exact && ( exp | sig ) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
        return 0;
    }
    sign = signF32UI( uiA );
    shiftCount = 0x9E - exp;
    if ( shiftCount <= 0 ) {
        if ( uiA != packToF32UI( 1, 0x9E, 0 ) ) {
            softfloat_raiseFlags( softfloat_flag_invalid );
            if ( ! sign || ( ( exp == 0xFF ) && sig ) ) return 0x7FFFFFFF;
        }
        return -0x7FFFFFFF - 1;
    }
    sig = ( sig | 0x00800000 )<<8;
    absZ = sig>>shiftCount;
    if ( exact && (uint32_t) ( sig<<( ( - shiftCount ) & 31 ) ) ) {
        softfloat_exceptionFlags |= softfloat_flag_inexact;
    }
    return sign ? - absZ : absZ;

}