Ejemplo n.º 1
0
struct fp_ext *
fp_fdiv(struct fp_ext *dest, struct fp_ext *src)
{
	union fp_mant128 temp;
	int exp;

	dprint(PINSTR, "fdiv\n");

	fp_dyadic_check(dest, src);

	/* calculate the correct sign now, as it's necessary for infinities */
	dest->sign = src->sign ^ dest->sign;

	/* Handle infinities */
	if (IS_INF(dest)) {
		/* infinity / infinity = NaN (quiet, as always) */
		if (IS_INF(src))
			fp_set_nan(dest);
		/* infinity / anything else = infinity (with approprate sign) */
		return dest;
	}
	if (IS_INF(src)) {
		/* anything / infinity = zero (with appropriate sign) */
		dest->exp = 0;
		dest->mant.m64 = 0;
		dest->lowmant = 0;

		return dest;
	}

	/* zeroes */
	if (IS_ZERO(dest)) {
		/* zero / zero = NaN */
		if (IS_ZERO(src))
			fp_set_nan(dest);
		/* zero / anything else = zero */
		return dest;
	}
	if (IS_ZERO(src)) {
		/* anything / zero = infinity (with appropriate sign) */
		fp_set_sr(FPSR_EXC_DZ);
		dest->exp = 0x7fff;
		dest->mant.m64 = 0;

		return dest;
	}

	exp = dest->exp - src->exp + 0x3fff;

	/* shift up the mantissa for denormalized numbers,
	   so that the highest bit is set, this makes lots
	   of things below easier */
	if ((long)dest->mant.m32[0] >= 0)
		exp -= fp_overnormalize(dest);
	if ((long)src->mant.m32[0] >= 0)
		exp -= fp_overnormalize(src);

	/* now, do the 64-bit divide */
	fp_dividemant(&temp, dest, src);

	/* normalize it back to 64 bits and stuff it back into the
	   destination struct */
	if (!temp.m32[0]) {
		exp--;
		fp_putmant128(dest, &temp, 32);
	} else
		fp_putmant128(dest, &temp, 31);

	if (exp >= 0x7fff) {
		fp_set_ovrflw(dest);
		return dest;
	}
	dest->exp = exp;
	if (exp < 0) {
		fp_set_sr(FPSR_EXC_UNFL);
		fp_denormalize(dest, -exp);
	}

	return dest;
}
Ejemplo n.º 2
0
struct fp_ext *
fp_fdiv(struct fp_ext *dest, struct fp_ext *src)
{
	union fp_mant128 temp;
	int exp;

	dprint(PINSTR, "fdiv\n");

	fp_dyadic_check(dest, src);

	/*                                                                  */
	dest->sign = src->sign ^ dest->sign;

	/*                   */
	if (IS_INF(dest)) {
		/*                                              */
		if (IS_INF(src))
			fp_set_nan(dest);
		/*                                                            */
		return dest;
	}
	if (IS_INF(src)) {
		/*                                                    */
		dest->exp = 0;
		dest->mant.m64 = 0;
		dest->lowmant = 0;

		return dest;
	}

	/*        */
	if (IS_ZERO(dest)) {
		/*                   */
		if (IS_ZERO(src))
			fp_set_nan(dest);
		/*                             */
		return dest;
	}
	if (IS_ZERO(src)) {
		/*                                                    */
		fp_set_sr(FPSR_EXC_DZ);
		dest->exp = 0x7fff;
		dest->mant.m64 = 0;

		return dest;
	}

	exp = dest->exp - src->exp + 0x3fff;

	/*                                                
                                                   
                           */
	if ((long)dest->mant.m32[0] >= 0)
		exp -= fp_overnormalize(dest);
	if ((long)src->mant.m32[0] >= 0)
		exp -= fp_overnormalize(src);

	/*                           */
	fp_dividemant(&temp, dest, src);

	/*                                                        
                       */
	if (!temp.m32[0]) {
		exp--;
		fp_putmant128(dest, &temp, 32);
	} else
		fp_putmant128(dest, &temp, 31);

	if (exp >= 0x7fff) {
		fp_set_ovrflw(dest);
		return dest;
	}
	dest->exp = exp;
	if (exp < 0) {
		fp_set_sr(FPSR_EXC_UNFL);
		fp_denormalize(dest, -exp);
	}

	return dest;
}
Ejemplo n.º 3
0
struct fp_ext *
fp_fmul(struct fp_ext *dest, struct fp_ext *src)
{
	union fp_mant128 temp;
	int exp;

	dprint(PINSTR, "fmul\n");

	fp_dyadic_check(dest, src);

	/* calculate the correct sign now, as it's necessary for infinities */
	dest->sign = src->sign ^ dest->sign;

	/* Handle infinities */
	if (IS_INF(dest)) {
		if (IS_ZERO(src))
			fp_set_nan(dest);
		return dest;
	}
	if (IS_INF(src)) {
		if (IS_ZERO(dest))
			fp_set_nan(dest);
		else
			fp_copy_ext(dest, src);
		return dest;
	}

	/* Of course, as we all know, zero * anything = zero.  You may
	   not have known that it might be a positive or negative
	   zero... */
	if (IS_ZERO(dest) || IS_ZERO(src)) {
		dest->exp = 0;
		dest->mant.m64 = 0;
		dest->lowmant = 0;

		return dest;
	}

	exp = dest->exp + src->exp - 0x3ffe;

	/* shift up the mantissa for denormalized numbers,
	   so that the highest bit is set, this makes the
	   shift of the result below easier */
	if ((long)dest->mant.m32[0] >= 0)
		exp -= fp_overnormalize(dest);
	if ((long)src->mant.m32[0] >= 0)
		exp -= fp_overnormalize(src);

	/* now, do a 64-bit multiply with expansion */
	fp_multiplymant(&temp, dest, src);

	/* normalize it back to 64 bits and stuff it back into the
	   destination struct */
	if ((long)temp.m32[0] > 0) {
		exp--;
		fp_putmant128(dest, &temp, 1);
	} else
		fp_putmant128(dest, &temp, 0);

	if (exp >= 0x7fff) {
		fp_set_ovrflw(dest);
		return dest;
	}
	dest->exp = exp;
	if (exp < 0) {
		fp_set_sr(FPSR_EXC_UNFL);
		fp_denormalize(dest, -exp);
	}

	return dest;
}
Ejemplo n.º 4
0
struct fp_ext *
fp_fmul(struct fp_ext *dest, struct fp_ext *src)
{
	union fp_mant128 temp;
	int exp;

	dprint(PINSTR, "fmul\n");

	fp_dyadic_check(dest, src);

	/*                                                                  */
	dest->sign = src->sign ^ dest->sign;

	/*                   */
	if (IS_INF(dest)) {
		if (IS_ZERO(src))
			fp_set_nan(dest);
		return dest;
	}
	if (IS_INF(src)) {
		if (IS_ZERO(dest))
			fp_set_nan(dest);
		else
			fp_copy_ext(dest, src);
		return dest;
	}

	/*                                                            
                                                          
            */
	if (IS_ZERO(dest) || IS_ZERO(src)) {
		dest->exp = 0;
		dest->mant.m64 = 0;
		dest->lowmant = 0;

		return dest;
	}

	exp = dest->exp + src->exp - 0x3ffe;

	/*                                                
                                                  
                                     */
	if ((long)dest->mant.m32[0] >= 0)
		exp -= fp_overnormalize(dest);
	if ((long)src->mant.m32[0] >= 0)
		exp -= fp_overnormalize(src);

	/*                                          */
	fp_multiplymant(&temp, dest, src);

	/*                                                        
                       */
	if ((long)temp.m32[0] > 0) {
		exp--;
		fp_putmant128(dest, &temp, 1);
	} else
		fp_putmant128(dest, &temp, 0);

	if (exp >= 0x7fff) {
		fp_set_ovrflw(dest);
		return dest;
	}
	dest->exp = exp;
	if (exp < 0) {
		fp_set_sr(FPSR_EXC_UNFL);
		fp_denormalize(dest, -exp);
	}

	return dest;
}