s_roundToI32.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	softfloat_roundToI32 (bool sign, uint_fast64_t sig, uint_fast8_t roundingMode, bool exact)

Function Documentation

softfloat_roundToI32()

int_fast32_t softfloat_roundToI32	(	bool	sign,
		uint_fast64_t	sig,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 45 of file s_roundToI32.c.

{
    uint_fast16_t roundIncrement, roundBits;
    uint_fast32_t sig32;
    union { uint32_t ui; int32_t i; } uZ;
    int_fast32_t z;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    roundIncrement = 0x800;
    if (
        (roundingMode != softfloat_round_near_maxMag)
            && (roundingMode != softfloat_round_near_even)
    ) {
        roundIncrement = 0;
        if ( 
            sign
                ? (roundingMode == softfloat_round_min)
#ifdef SOFTFLOAT_ROUND_ODD
                      || (roundingMode == softfloat_round_odd)
#endif
                : (roundingMode == softfloat_round_max)
        ) {
            roundIncrement = 0xFFF;
        }
    }
    roundBits = sig & 0xFFF;
    sig += roundIncrement;
    if ( sig & UINT64_C( 0xFFFFF00000000000 ) ) goto invalid;
    sig32 = sig>>12;
    if (
        (roundBits == 0x800) && (roundingMode == softfloat_round_near_even)
    ) {
        sig32 &= ~(uint_fast32_t) 1;
    }
    uZ.ui = sign ? -sig32 : sig32;
    z = uZ.i;
    if ( z && ((z < 0) ^ sign) ) 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 ? i32_fromNegOverflow : i32_fromPosOverflow;
 
}

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