Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 819 insertions, 0 deletions

diff --git a/arch/m68k/math-emu/multi_arith.h b/arch/m68k/math-emu/multi_arith.h
new file mode 100644
index 00000000000..02251e5afd8
--- /dev/null
+++ b/arch/m68k/math-emu/multi_arith.h
@@ -0,0 +1,819 @@
+/* multi_arith.h: multi-precision integer arithmetic functions, needed
+   to do extended-precision floating point.
+
+   (c) 1998 David Huggins-Daines.
+
+   Somewhat based on arch/alpha/math-emu/ieee-math.c, which is (c)
+   David Mosberger-Tang.
+
+   You may copy, modify, and redistribute this file under the terms of
+   the GNU General Public License, version 2, or any later version, at
+   your convenience. */
+
+/* Note:
+
+   These are not general multi-precision math routines.  Rather, they
+   implement the subset of integer arithmetic that we need in order to
+   multiply, divide, and normalize 128-bit unsigned mantissae.  */
+
+#ifndef MULTI_ARITH_H
+#define MULTI_ARITH_H
+
+#if 0	/* old code... */
+
+/* Unsigned only, because we don't need signs to multiply and divide. */
+typedef unsigned int int128[4];
+
+/* Word order */
+enum {
+	MSW128,
+	NMSW128,
+	NLSW128,
+	LSW128
+};
+
+/* big-endian */
+#define LO_WORD(ll) (((unsigned int *) &ll)[1])
+#define HI_WORD(ll) (((unsigned int *) &ll)[0])
+
+/* Convenience functions to stuff various integer values into int128s */
+
+static inline void zero128(int128 a)
+{
+	a[LSW128] = a[NLSW128] = a[NMSW128] = a[MSW128] = 0;
+}
+
+/* Human-readable word order in the arguments */
+static inline void set128(unsigned int i3, unsigned int i2, unsigned int i1,
+			  unsigned int i0, int128 a)
+{
+	a[LSW128] = i0;
+	a[NLSW128] = i1;
+	a[NMSW128] = i2;
+	a[MSW128] = i3;
+}
+
+/* Convenience functions (for testing as well) */
+static inline void int64_to_128(unsigned long long src, int128 dest)
+{
+	dest[LSW128] = (unsigned int) src;
+	dest[NLSW128] = src >> 32;
+	dest[NMSW128] = dest[MSW128] = 0;
+}
+
+static inline void int128_to_64(const int128 src, unsigned long long *dest)
+{
+	*dest = src[LSW128] | (long long) src[NLSW128] << 32;
+}
+
+static inline void put_i128(const int128 a)
+{
+	printk("%08x %08x %08x %08x\n", a[MSW128], a[NMSW128],
+	       a[NLSW128], a[LSW128]);
+}
+
+/* Internal shifters:
+
+   Note that these are only good for 0 < count < 32.
+ */
+
+static inline void _lsl128(unsigned int count, int128 a)
+{
+	a[MSW128] = (a[MSW128] << count) | (a[NMSW128] >> (32 - count));
+	a[NMSW128] = (a[NMSW128] << count) | (a[NLSW128] >> (32 - count));
+	a[NLSW128] = (a[NLSW128] << count) | (a[LSW128] >> (32 - count));
+	a[LSW128] <<= count;
+}
+
+static inline void _lsr128(unsigned int count, int128 a)
+{
+	a[LSW128] = (a[LSW128] >> count) | (a[NLSW128] << (32 - count));
+	a[NLSW128] = (a[NLSW128] >> count) | (a[NMSW128] << (32 - count));
+	a[NMSW128] = (a[NMSW128] >> count) | (a[MSW128] << (32 - count));
+	a[MSW128] >>= count;
+}
+
+/* Should be faster, one would hope */
+
+static inline void lslone128(int128 a)
+{
+	asm volatile ("lsl.l #1,%0\n"
+		      "roxl.l #1,%1\n"
+		      "roxl.l #1,%2\n"
+		      "roxl.l #1,%3\n"
+		      :
+		      "=d" (a[LSW128]),
+		      "=d"(a[NLSW128]),
+		      "=d"(a[NMSW128]),
+		      "=d"(a[MSW128])
+		      :
+		      "0"(a[LSW128]),
+		      "1"(a[NLSW128]),
+		      "2"(a[NMSW128]),
+		      "3"(a[MSW128]));
+}
+
+static inline void lsrone128(int128 a)
+{
+	asm volatile ("lsr.l #1,%0\n"
+		      "roxr.l #1,%1\n"
+		      "roxr.l #1,%2\n"
+		      "roxr.l #1,%3\n"
+		      :
+		      "=d" (a[MSW128]),
+		      "=d"(a[NMSW128]),
+		      "=d"(a[NLSW128]),
+		      "=d"(a[LSW128])
+		      :
+		      "0"(a[MSW128]),
+		      "1"(a[NMSW128]),
+		      "2"(a[NLSW128]),
+		      "3"(a[LSW128]));
+}
+
+/* Generalized 128-bit shifters:
+
+   These bit-shift to a multiple of 32, then move whole longwords.  */
+
+static inline void lsl128(unsigned int count, int128 a)
+{
+	int wordcount, i;
+
+	if (count % 32)
+		_lsl128(count % 32, a);
+
+	if (0 == (wordcount = count / 32))
+		return;
+
+	/* argh, gak, endian-sensitive */
+	for (i = 0; i < 4 - wordcount; i++) {
+		a[i] = a[i + wordcount];
+	}
+	for (i = 3; i >= 4 - wordcount; --i) {
+		a[i] = 0;
+	}
+}
+
+static inline void lsr128(unsigned int count, int128 a)
+{
+	int wordcount, i;
+
+	if (count % 32)
+		_lsr128(count % 32, a);
+
+	if (0 == (wordcount = count / 32))
+		return;
+
+	for (i = 3; i >= wordcount; --i) {
+		a[i] = a[i - wordcount];
+	}
+	for (i = 0; i < wordcount; i++) {
+		a[i] = 0;
+	}
+}
+
+static inline int orl128(int a, int128 b)
+{
+	b[LSW128] |= a;
+}
+
+static inline int btsthi128(const int128 a)
+{
+	return a[MSW128] & 0x80000000;
+}
+
+/* test bits (numbered from 0 = LSB) up to and including "top" */
+static inline int bftestlo128(int top, const int128 a)
+{
+	int r = 0;
+
+	if (top > 31)
+		r |= a[LSW128];
+	if (top > 63)
+		r |= a[NLSW128];
+	if (top > 95)
+		r |= a[NMSW128];
+
+	r |= a[3 - (top / 32)] & ((1 << (top % 32 + 1)) - 1);
+
+	return (r != 0);
+}
+
+/* Aargh.  We need these because GCC is broken */
+/* FIXME: do them in assembly, for goodness' sake! */
+static inline void mask64(int pos, unsigned long long *mask)
+{
+	*mask = 0;
+
+	if (pos < 32) {
+		LO_WORD(*mask) = (1 << pos) - 1;
+		return;
+	}
+	LO_WORD(*mask) = -1;
+	HI_WORD(*mask) = (1 << (pos - 32)) - 1;
+}
+
+static inline void bset64(int pos, unsigned long long *dest)
+{
+	/* This conditional will be optimized away.  Thanks, GCC! */
+	if (pos < 32)
+		asm volatile ("bset %1,%0":"=m"
+			      (LO_WORD(*dest)):"id"(pos));
+	else
+		asm volatile ("bset %1,%0":"=m"
+			      (HI_WORD(*dest)):"id"(pos - 32));
+}
+
+static inline int btst64(int pos, unsigned long long dest)
+{
+	if (pos < 32)
+		return (0 != (LO_WORD(dest) & (1 << pos)));
+	else
+		return (0 != (HI_WORD(dest) & (1 << (pos - 32))));
+}
+
+static inline void lsl64(int count, unsigned long long *dest)
+{
+	if (count < 32) {
+		HI_WORD(*dest) = (HI_WORD(*dest) << count)
+		    | (LO_WORD(*dest) >> count);
+		LO_WORD(*dest) <<= count;
+		return;
+	}
+	count -= 32;
+	HI_WORD(*dest) = LO_WORD(*dest) << count;
+	LO_WORD(*dest) = 0;
+}
+
+static inline void lsr64(int count, unsigned long long *dest)
+{
+	if (count < 32) {
+		LO_WORD(*dest) = (LO_WORD(*dest) >> count)
+		    | (HI_WORD(*dest) << (32 - count));
+		HI_WORD(*dest) >>= count;
+		return;
+	}
+	count -= 32;
+	LO_WORD(*dest) = HI_WORD(*dest) >> count;
+	HI_WORD(*dest) = 0;
+}
+#endif
+
+static inline void fp_denormalize(struct fp_ext *reg, unsigned int cnt)
+{
+	reg->exp += cnt;
+
+	switch (cnt) {
+	case 0 ... 8:
+		reg->lowmant = reg->mant.m32[1] << (8 - cnt);
+		reg->mant.m32[1] = (reg->mant.m32[1] >> cnt) |
+				   (reg->mant.m32[0] << (32 - cnt));
+		reg->mant.m32[0] = reg->mant.m32[0] >> cnt;
+		break;
+	case 9 ... 32:
+		reg->lowmant = reg->mant.m32[1] >> (cnt - 8);
+		if (reg->mant.m32[1] << (40 - cnt))
+			reg->lowmant |= 1;
+		reg->mant.m32[1] = (reg->mant.m32[1] >> cnt) |
+				   (reg->mant.m32[0] << (32 - cnt));
+		reg->mant.m32[0] = reg->mant.m32[0] >> cnt;
+		break;
+	case 33 ... 39:
+		asm volatile ("bfextu %1{%2,#8},%0" : "=d" (reg->lowmant)
+			: "m" (reg->mant.m32[0]), "d" (64 - cnt));
+		if (reg->mant.m32[1] << (40 - cnt))
+			reg->lowmant |= 1;
+		reg->mant.m32[1] = reg->mant.m32[0] >> (cnt - 32);
+		reg->mant.m32[0] = 0;
+		break;
+	case 40 ... 71:
+		reg->lowmant = reg->mant.m32[0] >> (cnt - 40);
+		if ((reg->mant.m32[0] << (72 - cnt)) || reg->mant.m32[1])
+			reg->lowmant |= 1;
+		reg->mant.m32[1] = reg->mant.m32[0] >> (cnt - 32);
+		reg->mant.m32[0] = 0;
+		break;
+	default:
+		reg->lowmant = reg->mant.m32[0] || reg->mant.m32[1];
+		reg->mant.m32[0] = 0;
+		reg->mant.m32[1] = 0;
+		break;
+	}
+}
+
+static inline int fp_overnormalize(struct fp_ext *reg)
+{
+	int shift;
+
+	if (reg->mant.m32[0]) {
+		asm ("bfffo %1{#0,#32},%0" : "=d" (shift) : "dm" (reg->mant.m32[0]));
+		reg->mant.m32[0] = (reg->mant.m32[0] << shift) | (reg->mant.m32[1] >> (32 - shift));
+		reg->mant.m32[1] = (reg->mant.m32[1] << shift);
+	} else {
+		asm ("bfffo %1{#0,#32},%0" : "=d" (shift) : "dm" (reg->mant.m32[1]));
+		reg->mant.m32[0] = (reg->mant.m32[1] << shift);
+		reg->mant.m32[1] = 0;
+		shift += 32;
+	}
+
+	return shift;
+}
+
+static inline int fp_addmant(struct fp_ext *dest, struct fp_ext *src)
+{
+	int carry;
+
+	/* we assume here, gcc only insert move and a clr instr */
+	asm volatile ("add.b %1,%0" : "=d,g" (dest->lowmant)
+		: "g,d" (src->lowmant), "0,0" (dest->lowmant));
+	asm volatile ("addx.l %1,%0" : "=d" (dest->mant.m32[1])
+		: "d" (src->mant.m32[1]), "0" (dest->mant.m32[1]));
+	asm volatile ("addx.l %1,%0" : "=d" (dest->mant.m32[0])
+		: "d" (src->mant.m32[0]), "0" (dest->mant.m32[0]));
+	asm volatile ("addx.l %0,%0" : "=d" (carry) : "0" (0));
+
+	return carry;
+}
+
+static inline int fp_addcarry(struct fp_ext *reg)
+{
+	if (++reg->exp == 0x7fff) {
+		if (reg->mant.m64)
+			fp_set_sr(FPSR_EXC_INEX2);
+		reg->mant.m64 = 0;
+		fp_set_sr(FPSR_EXC_OVFL);
+		return 0;
+	}
+	reg->lowmant = (reg->mant.m32[1] << 7) | (reg->lowmant ? 1 : 0);
+	reg->mant.m32[1] = (reg->mant.m32[1] >> 1) |
+			   (reg->mant.m32[0] << 31);
+	reg->mant.m32[0] = (reg->mant.m32[0] >> 1) | 0x80000000;
+
+	return 1;
+}
+
+static inline void fp_submant(struct fp_ext *dest, struct fp_ext *src1,
+			      struct fp_ext *src2)
+{
+	/* we assume here, gcc only insert move and a clr instr */
+	asm volatile ("sub.b %1,%0" : "=d,g" (dest->lowmant)
+		: "g,d" (src2->lowmant), "0,0" (src1->lowmant));
+	asm volatile ("subx.l %1,%0" : "=d" (dest->mant.m32[1])
+		: "d" (src2->mant.m32[1]), "0" (src1->mant.m32[1]));
+	asm volatile ("subx.l %1,%0" : "=d" (dest->mant.m32[0])
+		: "d" (src2->mant.m32[0]), "0" (src1->mant.m32[0]));
+}
+
+#define fp_mul64(desth, destl, src1, src2) ({				\
+	asm ("mulu.l %2,%1:%0" : "=d" (destl), "=d" (desth)		\
+		: "g" (src1), "0" (src2));				\
+})
+#define fp_div64(quot, rem, srch, srcl, div)				\
+	asm ("divu.l %2,%1:%0" : "=d" (quot), "=d" (rem)		\
+		: "dm" (div), "1" (srch), "0" (srcl))
+#define fp_add64(dest1, dest2, src1, src2) ({				\
+	asm ("add.l %1,%0" : "=d,dm" (dest2)				\
+		: "dm,d" (src2), "0,0" (dest2));			\
+	asm ("addx.l %1,%0" : "=d" (dest1)				\
+		: "d" (src1), "0" (dest1));				\
+})
+#define fp_addx96(dest, src) ({						\
+	/* we assume here, gcc only insert move and a clr instr */	\
+	asm volatile ("add.l %1,%0" : "=d,g" (dest->m32[2])		\
+		: "g,d" (temp.m32[1]), "0,0" (dest->m32[2]));		\
+	asm volatile ("addx.l %1,%0" : "=d" (dest->m32[1])		\
+		: "d" (temp.m32[0]), "0" (dest->m32[1]));		\
+	asm volatile ("addx.l %1,%0" : "=d" (dest->m32[0])		\
+		: "d" (0), "0" (dest->m32[0]));				\
+})
+#define fp_sub64(dest, src) ({						\
+	asm ("sub.l %1,%0" : "=d,dm" (dest.m32[1])			\
+		: "dm,d" (src.m32[1]), "0,0" (dest.m32[1]));		\
+	asm ("subx.l %1,%0" : "=d" (dest.m32[0])			\
+		: "d" (src.m32[0]), "0" (dest.m32[0]));			\
+})
+#define fp_sub96c(dest, srch, srcm, srcl) ({				\
+	char carry;							\
+	asm ("sub.l %1,%0" : "=d,dm" (dest.m32[2])			\
+		: "dm,d" (srcl), "0,0" (dest.m32[2]));			\
+	asm ("subx.l %1,%0" : "=d" (dest.m32[1])			\
+		: "d" (srcm), "0" (dest.m32[1]));			\
+	asm ("subx.l %2,%1; scs %0" : "=d" (carry), "=d" (dest.m32[0])	\
+		: "d" (srch), "1" (dest.m32[0]));			\
+	carry;								\
+})
+
+static inline void fp_multiplymant(union fp_mant128 *dest, struct fp_ext *src1,
+				   struct fp_ext *src2)
+{
+	union fp_mant64 temp;
+
+	fp_mul64(dest->m32[0], dest->m32[1], src1->mant.m32[0], src2->mant.m32[0]);
+	fp_mul64(dest->m32[2], dest->m32[3], src1->mant.m32[1], src2->mant.m32[1]);
+
+	fp_mul64(temp.m32[0], temp.m32[1], src1->mant.m32[0], src2->mant.m32[1]);
+	fp_addx96(dest, temp);
+
+	fp_mul64(temp.m32[0], temp.m32[1], src1->mant.m32[1], src2->mant.m32[0]);
+	fp_addx96(dest, temp);
+}
+
+static inline void fp_dividemant(union fp_mant128 *dest, struct fp_ext *src,
+				 struct fp_ext *div)
+{
+	union fp_mant128 tmp;
+	union fp_mant64 tmp64;
+	unsigned long *mantp = dest->m32;
+	unsigned long fix, rem, first, dummy;
+	int i;
+
+	/* the algorithm below requires dest to be smaller than div,
+	   but both have the high bit set */
+	if (src->mant.m64 >= div->mant.m64) {
+		fp_sub64(src->mant, div->mant);
+		*mantp = 1;
+	} else
+		*mantp = 0;
+	mantp++;
+
+	/* basic idea behind this algorithm: we can't divide two 64bit numbers
+	   (AB/CD) directly, but we can calculate AB/C0, but this means this
+	   quotient is off by C0/CD, so we have to multiply the first result
+	   to fix the result, after that we have nearly the correct result
+	   and only a few corrections are needed. */
+
+	/* C0/CD can be precalculated, but it's an 64bit division again, but
+	   we can make it a bit easier, by dividing first through C so we get
+	   10/1D and now only a single shift and the value fits into 32bit. */
+	fix = 0x80000000;
+	dummy = div->mant.m32[1] / div->mant.m32[0] + 1;
+	dummy = (dummy >> 1) | fix;
+	fp_div64(fix, dummy, fix, 0, dummy);
+	fix--;
+
+	for (i = 0; i < 3; i++, mantp++) {
+		if (src->mant.m32[0] == div->mant.m32[0]) {
+			fp_div64(first, rem, 0, src->mant.m32[1], div->mant.m32[0]);
+
+			fp_mul64(*mantp, dummy, first, fix);
+			*mantp += fix;
+		} else {
+			fp_div64(first, rem, src->mant.m32[0], src->mant.m32[1], div->mant.m32[0]);
+
+			fp_mul64(*mantp, dummy, first, fix);
+		}
+
+		fp_mul64(tmp.m32[0], tmp.m32[1], div->mant.m32[0], first - *mantp);
+		fp_add64(tmp.m32[0], tmp.m32[1], 0, rem);
+		tmp.m32[2] = 0;
+
+		fp_mul64(tmp64.m32[0], tmp64.m32[1], *mantp, div->mant.m32[1]);
+		fp_sub96c(tmp, 0, tmp64.m32[0], tmp64.m32[1]);
+
+		src->mant.m32[0] = tmp.m32[1];
+		src->mant.m32[1] = tmp.m32[2];
+
+		while (!fp_sub96c(tmp, 0, div->mant.m32[0], div->mant.m32[1])) {
+			src->mant.m32[0] = tmp.m32[1];
+			src->mant.m32[1] = tmp.m32[2];
+			*mantp += 1;
+		}
+	}
+}
+
+#if 0
+static inline unsigned int fp_fls128(union fp_mant128 *src)
+{
+	unsigned long data;
+	unsigned int res, off;
+
+	if ((data = src->m32[0]))
+		off = 0;
+	else if ((data = src->m32[1]))
+		off = 32;
+	else if ((data = src->m32[2]))
+		off = 64;
+	else if ((data = src->m32[3]))
+		off = 96;
+	else
+		return 128;
+
+	asm ("bfffo %1{#0,#32},%0" : "=d" (res) : "dm" (data));
+	return res + off;
+}
+
+static inline void fp_shiftmant128(union fp_mant128 *src, int shift)
+{
+	unsigned long sticky;
+
+	switch (shift) {
+	case 0:
+		return;
+	case 1:
+		asm volatile ("lsl.l #1,%0"
+			: "=d" (src->m32[3]) : "0" (src->m32[3]));
+		asm volatile ("roxl.l #1,%0"
+			: "=d" (src->m32[2]) : "0" (src->m32[2]));
+		asm volatile ("roxl.l #1,%0"
+			: "=d" (src->m32[1]) : "0" (src->m32[1]));
+		asm volatile ("roxl.l #1,%0"
+			: "=d" (src->m32[0]) : "0" (src->m32[0]));
+		return;
+	case 2 ... 31:
+		src->m32[0] = (src->m32[0] << shift) | (src->m32[1] >> (32 - shift));
+		src->m32[1] = (src->m32[1] << shift) | (src->m32[2] >> (32 - shift));
+		src->m32[2] = (src->m32[2] << shift) | (src->m32[3] >> (32 - shift));
+		src->m32[3] = (src->m32[3] << shift);
+		return;
+	case 32 ... 63:
+		shift -= 32;
+		src->m32[0] = (src->m32[1] << shift) | (src->m32[2] >> (32 - shift));
+		src->m32[1] = (src->m32[2] << shift) | (src->m32[3] >> (32 - shift));
+		src->m32[2] = (src->m32[3] << shift);
+		src->m32[3] = 0;
+		return;
+	case 64 ... 95:
+		shift -= 64;
+		src->m32[0] = (src->m32[2] << shift) | (src->m32[3] >> (32 - shift));
+		src->m32[1] = (src->m32[3] << shift);
+		src->m32[2] = src->m32[3] = 0;
+		return;
+	case 96 ... 127:
+		shift -= 96;
+		src->m32[0] = (src->m32[3] << shift);
+		src->m32[1] = src->m32[2] = src->m32[3] = 0;
+		return;
+	case -31 ... -1:
+		shift = -shift;
+		sticky = 0;
+		if (src->m32[3] << (32 - shift))
+			sticky = 1;
+		src->m32[3] = (src->m32[3] >> shift) | (src->m32[2] << (32 - shift)) | sticky;
+		src->m32[2] = (src->m32[2] >> shift) | (src->m32[1] << (32 - shift));
+		src->m32[1] = (src->m32[1] >> shift) | (src->m32[0] << (32 - shift));
+		src->m32[0] = (src->m32[0] >> shift);
+		return;
+	case -63 ... -32:
+		shift = -shift - 32;
+		sticky = 0;
+		if ((src->m32[2] << (32 - shift)) || src->m32[3])
+			sticky = 1;
+		src->m32[3] = (src->m32[2] >> shift) | (src->m32[1] << (32 - shift)) | sticky;
+		src->m32[2] = (src->m32[1] >> shift) | (src->m32[0] << (32 - shift));
+		src->m32[1] = (src->m32[0] >> shift);
+		src->m32[0] = 0;
+		return;
+	case -95 ... -64:
+		shift = -shift - 64;
+		sticky = 0;
+		if ((src->m32[1] << (32 - shift)) || src->m32[2] || src->m32[3])
+			sticky = 1;
+		src->m32[3] = (src->m32[1] >> shift) | (src->m32[0] << (32 - shift)) | sticky;
+		src->m32[2] = (src->m32[0] >> shift);
+		src->m32[1] = src->m32[0] = 0;
+		return;
+	case -127 ... -96:
+		shift = -shift - 96;
+		sticky = 0;
+		if ((src->m32[0] << (32 - shift)) || src->m32[1] || src->m32[2] || src->m32[3])
+			sticky = 1;
+		src->m32[3] = (src->m32[0] >> shift) | sticky;
+		src->m32[2] = src->m32[1] = src->m32[0] = 0;
+		return;
+	}
+
+	if (shift < 0 && (src->m32[0] || src->m32[1] || src->m32[2] || src->m32[3]))
+		src->m32[3] = 1;
+	else
+		src->m32[3] = 0;
+	src->m32[2] = 0;
+	src->m32[1] = 0;
+	src->m32[0] = 0;
+}
+#endif
+
+static inline void fp_putmant128(struct fp_ext *dest, union fp_mant128 *src,
+				 int shift)
+{
+	unsigned long tmp;
+
+	switch (shift) {
+	case 0:
+		dest->mant.m64 = src->m64[0];
+		dest->lowmant = src->m32[2] >> 24;
+		if (src->m32[3] || (src->m32[2] << 8))
+			dest->lowmant |= 1;
+		break;
+	case 1:
+		asm volatile ("lsl.l #1,%0"
+			: "=d" (tmp) : "0" (src->m32[2]));
+		asm volatile ("roxl.l #1,%0"
+			: "=d" (dest->mant.m32[1]) : "0" (src->m32[1]));
+		asm volatile ("roxl.l #1,%0"
+			: "=d" (dest->mant.m32[0]) : "0" (src->m32[0]));
+		dest->lowmant = tmp >> 24;
+		if (src->m32[3] || (tmp << 8))
+			dest->lowmant |= 1;
+		break;
+	case 31:
+		asm volatile ("lsr.l #1,%1; roxr.l #1,%0"
+			: "=d" (dest->mant.m32[0])
+			: "d" (src->m32[0]), "0" (src->m32[1]));
+		asm volatile ("roxr.l #1,%0"
+			: "=d" (dest->mant.m32[1]) : "0" (src->m32[2]));
+		asm volatile ("roxr.l #1,%0"
+			: "=d" (tmp) : "0" (src->m32[3]));
+		dest->lowmant = tmp >> 24;
+		if (src->m32[3] << 7)
+			dest->lowmant |= 1;
+		break;
+	case 32:
+		dest->mant.m32[0] = src->m32[1];
+		dest->mant.m32[1] = src->m32[2];
+		dest->lowmant = src->m32[3] >> 24;
+		if (src->m32[3] << 8)
+			dest->lowmant |= 1;
+		break;
+	}
+}
+
+#if 0 /* old code... */
+static inline int fls(unsigned int a)
+{
+	int r;
+
+	asm volatile ("bfffo %1{#0,#32},%0"
+		      : "=d" (r) : "md" (a));
+	return r;
+}
+
+/* fls = "find last set" (cf. ffs(3)) */
+static inline int fls128(const int128 a)
+{
+	if (a[MSW128])
+		return fls(a[MSW128]);
+	if (a[NMSW128])
+		return fls(a[NMSW128]) + 32;
+	/* XXX: it probably never gets beyond this point in actual
+	   use, but that's indicative of a more general problem in the
+	   algorithm (i.e. as per the actual 68881 implementation, we
+	   really only need at most 67 bits of precision [plus
+	   overflow]) so I'm not going to fix it. */
+	if (a[NLSW128])
+		return fls(a[NLSW128]) + 64;
+	if (a[LSW128])
+		return fls(a[LSW128]) + 96;
+	else
+		return -1;
+}
+
+static inline int zerop128(const int128 a)
+{
+	return !(a[LSW128] | a[NLSW128] | a[NMSW128] | a[MSW128]);
+}
+
+static inline int nonzerop128(const int128 a)
+{
+	return (a[LSW128] | a[NLSW128] | a[NMSW128] | a[MSW128]);
+}
+
+/* Addition and subtraction */
+/* Do these in "pure" assembly, because "extended" asm is unmanageable
+   here */
+static inline void add128(const int128 a, int128 b)
+{
+	/* rotating carry flags */
+	unsigned int carry[2];
+
+	carry[0] = a[LSW128] > (0xffffffff - b[LSW128]);
+	b[LSW128] += a[LSW128];
+
+	carry[1] = a[NLSW128] > (0xffffffff - b[NLSW128] - carry[0]);
+	b[NLSW128] = a[NLSW128] + b[NLSW128] + carry[0];
+
+	carry[0] = a[NMSW128] > (0xffffffff - b[NMSW128] - carry[1]);
+	b[NMSW128] = a[NMSW128] + b[NMSW128] + carry[1];
+
+	b[MSW128] = a[MSW128] + b[MSW128] + carry[0];
+}
+
+/* Note: assembler semantics: "b -= a" */
+static inline void sub128(const int128 a, int128 b)
+{
+	/* rotating borrow flags */
+	unsigned int borrow[2];
+
+	borrow[0] = b[LSW128] < a[LSW128];
+	b[LSW128] -= a[LSW128];
+
+	borrow[1] = b[NLSW128] < a[NLSW128] + borrow[0];
+	b[NLSW128] = b[NLSW128] - a[NLSW128] - borrow[0];
+
+	borrow[0] = b[NMSW128] < a[NMSW128] + borrow[1];
+	b[NMSW128] = b[NMSW128] - a[NMSW128] - borrow[1];
+
+	b[MSW128] = b[MSW128] - a[MSW128] - borrow[0];
+}
+
+/* Poor man's 64-bit expanding multiply */
+static inline void mul64(unsigned long long a, unsigned long long b, int128 c)
+{
+	unsigned long long acc;
+	int128 acc128;
+
+	zero128(acc128);
+	zero128(c);
+
+	/* first the low words */
+	if (LO_WORD(a) && LO_WORD(b)) {
+		acc = (long long) LO_WORD(a) * LO_WORD(b);
+		c[NLSW128] = HI_WORD(acc);
+		c[LSW128] = LO_WORD(acc);
+	}
+	/* Next the high words */
+	if (HI_WORD(a) && HI_WORD(b)) {
+		acc = (long long) HI_WORD(a) * HI_WORD(b);
+		c[MSW128] = HI_WORD(acc);
+		c[NMSW128] = LO_WORD(acc);
+	}
+	/* The middle words */
+	if (LO_WORD(a) && HI_WORD(b)) {
+		acc = (long long) LO_WORD(a) * HI_WORD(b);
+		acc128[NMSW128] = HI_WORD(acc);
+		acc128[NLSW128] = LO_WORD(acc);
+		add128(acc128, c);
+	}
+	/* The first and last words */
+	if (HI_WORD(a) && LO_WORD(b)) {
+		acc = (long long) HI_WORD(a) * LO_WORD(b);
+		acc128[NMSW128] = HI_WORD(acc);
+		acc128[NLSW128] = LO_WORD(acc);
+		add128(acc128, c);
+	}
+}
+
+/* Note: unsigned */
+static inline int cmp128(int128 a, int128 b)
+{
+	if (a[MSW128] < b[MSW128])
+		return -1;
+	if (a[MSW128] > b[MSW128])
+		return 1;
+	if (a[NMSW128] < b[NMSW128])
+		return -1;
+	if (a[NMSW128] > b[NMSW128])
+		return 1;
+	if (a[NLSW128] < b[NLSW128])
+		return -1;
+	if (a[NLSW128] > b[NLSW128])
+		return 1;
+
+	return (signed) a[LSW128] - b[LSW128];
+}
+
+inline void div128(int128 a, int128 b, int128 c)
+{
+	int128 mask;
+
+	/* Algorithm:
+
+	   Shift the divisor until it's at least as big as the
+	   dividend, keeping track of the position to which we've
+	   shifted it, i.e. the power of 2 which we've multiplied it
+	   by.
+
+	   Then, for this power of 2 (the mask), and every one smaller
+	   than it, subtract the mask from the dividend and add it to
+	   the quotient until the dividend is smaller than the raised
+	   divisor.  At this point, divide the dividend and the mask
+	   by 2 (i.e. shift one place to the right).  Lather, rinse,
+	   and repeat, until there are no more powers of 2 left. */
+
+	/* FIXME: needless to say, there's room for improvement here too. */
+
+	/* Shift up */
+	/* XXX: since it just has to be "at least as big", we can
+	   probably eliminate this horribly wasteful loop.  I will
+	   have to prove this first, though */
+	set128(0, 0, 0, 1, mask);
+	while (cmp128(b, a) < 0 && !btsthi128(b)) {
+		lslone128(b);
+		lslone128(mask);
+	}
+
+	/* Shift down */
+	zero128(c);
+	do {
+		if (cmp128(a, b) >= 0) {
+			sub128(b, a);
+			add128(mask, c);
+		}
+		lsrone128(mask);
+		lsrone128(b);
+	} while (nonzerop128(mask));
+
+	/* The remainder is in a... */
+}
+#endif
+
+#endif	/* MULTI_ARITH_H */