s_roundMToUI64.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_roundMToUI64.c:

Go to the source code of this file.

Functions
uint_fast64_t	softfloat_roundMToUI64 (bool sign, uint32_t *extSigPtr, uint_fast8_t roundingMode, bool exact)

Function Documentation

softfloat_roundMToUI64()

uint_fast64_t softfloat_roundMToUI64	(	bool	sign,
		uint32_t *	extSigPtr,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 45 of file s_roundMToUI64.c.

{
    uint64_t sig;
    uint32_t sigExtra;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sig =
        (uint64_t) extSigPtr[indexWord( 3, 2 )]<<32
            | extSigPtr[indexWord( 3, 1 )];
    sigExtra = extSigPtr[indexWordLo( 3 )];
    if (
        (roundingMode == softfloat_round_near_maxMag)
            || (roundingMode == softfloat_round_near_even)
    ) {
        if ( 0x80000000 <= sigExtra ) goto increment;
    } else {
        if ( sign ) {
            if ( !(sig | sigExtra) ) 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) && sigExtra ) {
 increment:
                ++sig;
                if ( !sig ) goto invalid;
                if (
                    (sigExtra == 0x80000000)
                        && (roundingMode == softfloat_round_near_even)
                ) {
                    sig &= ~(uint_fast64_t) 1;
                }
            }
        }
    }
    if ( sign && sig ) goto invalid;
    if ( sigExtra ) {
#ifdef SOFTFLOAT_ROUND_ODD
        if ( roundingMode == softfloat_round_odd ) sig |= 1;
#endif
        if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
    }
    return sig;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_raiseFlags( softfloat_flag_invalid );
    return sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
 
}