Exemplo n.º 1
0
struct fp_ext *
fp_fsgldiv(struct fp_ext *dest, struct fp_ext *src)
{
	int exp;
	unsigned long quot, rem;

	dprint(PINSTR, "fsgldiv\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;

	dest->mant.m32[0] &= 0xffffff00;
	src->mant.m32[0] &= 0xffffff00;

	/* do the 32-bit divide */
	if (dest->mant.m32[0] >= src->mant.m32[0]) {
		fp_sub64(dest->mant, src->mant);
		fp_div64(quot, rem, dest->mant.m32[0], 0, src->mant.m32[0]);
		dest->mant.m32[0] = 0x80000000 | (quot >> 1);
		dest->mant.m32[1] = (quot & 1) | rem;	/* only for rounding */
	} else {
Exemplo n.º 2
0
struct fp_ext *
fp_fsgldiv(struct fp_ext *dest, struct fp_ext *src)
{
	int exp;
	unsigned long quot, rem;

	dprint(PINSTR, "fsgldiv\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;

	dest->mant.m32[0] &= 0xffffff00;
	src->mant.m32[0] &= 0xffffff00;

	/*                      */
	if (dest->mant.m32[0] >= src->mant.m32[0]) {
		fp_sub64(dest->mant, src->mant);
		fp_div64(quot, rem, dest->mant.m32[0], 0, src->mant.m32[0]);
		dest->mant.m32[0] = 0x80000000 | (quot >> 1);
		dest->mant.m32[1] = (quot & 1) | rem;	/*                   */
	} else {