extF80_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	extF80_to_i32 (extFloat80_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

extF80_to_i32()

int_fast32_t extF80_to_i32	(	extFloat80_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 45 of file extF80_to_i32.c.

{
    union { struct extFloat80M s; extFloat80_t f; } uA;
    uint_fast16_t uiA64;
    bool sign;
    int_fast32_t exp;
    uint_fast64_t sig;
    int_fast32_t shiftDist;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA64 = uA.s.signExp;
    sign = signExtF80UI64( uiA64 );
    exp  = expExtF80UI64( uiA64 );
    sig = uA.s.signif;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
#if (i32_fromNaN != i32_fromPosOverflow) || (i32_fromNaN != i32_fromNegOverflow)
    if ( (exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF )) ) {
#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
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0x4032 - exp;
    if ( shiftDist <= 0 ) shiftDist = 1;
    sig = softfloat_shiftRightJam64( sig, shiftDist );
    return softfloat_roundToI32( sign, sig, roundingMode, exact );
 
}

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