s_roundToUI32.c File Reference

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

Include dependency graph for s_roundToUI32.c:

Go to the source code of this file.

Functions
uint_fast32_t	softfloat_roundToUI32 (bool sign, uint_fast64_t sig, uint_fast8_t roundingMode, bool exact)

Function Documentation

softfloat_roundToUI32()

uint_fast32_t softfloat_roundToUI32	(	bool	sign,
		uint_fast64_t	sig,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 45 of file s_roundToUI32.c.

{
    uint_fast16_t roundIncrement, roundBits;
    uint_fast32_t z;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    roundIncrement = 0x800;
    if ( 
        (roundingMode != softfloat_round_near_maxMag) 
            && (roundingMode != softfloat_round_near_even)
    ) {
        roundIncrement = 0;
        if ( sign ) {
            if ( !sig ) return 0;
            if ( roundingMode == softfloat_round_min ) goto invalid;
#ifdef SOFTFLOAT_ROUND_ODD
            if ( roundingMode == softfloat_round_odd ) goto invalid;
#endif
        } else {
            if ( roundingMode == softfloat_round_max ) roundIncrement = 0xFFF;
        }
    }
    roundBits = sig & 0xFFF;
    sig += roundIncrement;
    if ( sig & UINT64_C( 0xFFFFF00000000000 ) ) goto invalid;
    z = sig>>12;
    if ( 
        (roundBits == 0x800) && (roundingMode == softfloat_round_near_even)
    ) {
        z &= ~(uint_fast32_t) 1;
    }
    if ( sign && z ) goto invalid;
    if ( roundBits ) {
#ifdef SOFTFLOAT_ROUND_ODD
        if ( roundingMode == softfloat_round_odd ) z |= 1;
#endif
        if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
    }
    return z;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_raiseFlags( softfloat_flag_invalid );
    return sign ? ui32_fromNegOverflow : ui32_fromPosOverflow;
 
}