Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1206 insertions, 0 deletions

diff --git a/arch/arm/vfp/vfpdouble.c b/arch/arm/vfp/vfpdouble.c
new file mode 100644
index 000000000..423f56dd4
--- /dev/null
+++ b/arch/arm/vfp/vfpdouble.c
@@ -0,0 +1,1206 @@
+/*
+ *  linux/arch/arm/vfp/vfpdouble.c
+ *
+ * This code is derived in part from John R. Housers softfloat library, which
+ * carries the following notice:
+ *
+ * ===========================================================================
+ * This C source file is part of the SoftFloat IEC/IEEE Floating-point
+ * Arithmetic Package, Release 2.
+ *
+ * Written by John R. Hauser.  This work was made possible in part by the
+ * International Computer Science Institute, located at Suite 600, 1947 Center
+ * Street, Berkeley, California 94704.  Funding was partially provided by the
+ * National Science Foundation under grant MIP-9311980.  The original version
+ * of this code was written as part of a project to build a fixed-point vector
+ * processor in collaboration with the University of California at Berkeley,
+ * overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
+ * is available through the web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
+ * arithmetic/softfloat.html'.
+ *
+ * THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort
+ * has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
+ * TIMES RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO
+ * PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
+ * AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
+ *
+ * Derivative works are acceptable, even for commercial purposes, so long as
+ * (1) they include prominent notice that the work is derivative, and (2) they
+ * include prominent notice akin to these three paragraphs for those parts of
+ * this code that are retained.
+ * ===========================================================================
+ */
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+
+#include <asm/div64.h>
+#include <asm/vfp.h>
+
+#include "vfpinstr.h"
+#include "vfp.h"
+
+static struct vfp_double vfp_double_default_qnan = {
+	.exponent	= 2047,
+	.sign		= 0,
+	.significand	= VFP_DOUBLE_SIGNIFICAND_QNAN,
+};
+
+static void vfp_double_dump(const char *str, struct vfp_double *d)
+{
+	pr_debug("VFP: %s: sign=%d exponent=%d significand=%016llx\n",
+		 str, d->sign != 0, d->exponent, d->significand);
+}
+
+static void vfp_double_normalise_denormal(struct vfp_double *vd)
+{
+	int bits = 31 - fls(vd->significand >> 32);
+	if (bits == 31)
+		bits = 63 - fls(vd->significand);
+
+	vfp_double_dump("normalise_denormal: in", vd);
+
+	if (bits) {
+		vd->exponent -= bits - 1;
+		vd->significand <<= bits;
+	}
+
+	vfp_double_dump("normalise_denormal: out", vd);
+}
+
+u32 vfp_double_normaliseround(int dd, struct vfp_double *vd, u32 fpscr, u32 exceptions, const char *func)
+{
+	u64 significand, incr;
+	int exponent, shift, underflow;
+	u32 rmode;
+
+	vfp_double_dump("pack: in", vd);
+
+	/*
+	 * Infinities and NaNs are a special case.
+	 */
+	if (vd->exponent == 2047 && (vd->significand == 0 || exceptions))
+		goto pack;
+
+	/*
+	 * Special-case zero.
+	 */
+	if (vd->significand == 0) {
+		vd->exponent = 0;
+		goto pack;
+	}
+
+	exponent = vd->exponent;
+	significand = vd->significand;
+
+	shift = 32 - fls(significand >> 32);
+	if (shift == 32)
+		shift = 64 - fls(significand);
+	if (shift) {
+		exponent -= shift;
+		significand <<= shift;
+	}
+
+#ifdef DEBUG
+	vd->exponent = exponent;
+	vd->significand = significand;
+	vfp_double_dump("pack: normalised", vd);
+#endif
+
+	/*
+	 * Tiny number?
+	 */
+	underflow = exponent < 0;
+	if (underflow) {
+		significand = vfp_shiftright64jamming(significand, -exponent);
+		exponent = 0;
+#ifdef DEBUG
+		vd->exponent = exponent;
+		vd->significand = significand;
+		vfp_double_dump("pack: tiny number", vd);
+#endif
+		if (!(significand & ((1ULL << (VFP_DOUBLE_LOW_BITS + 1)) - 1)))
+			underflow = 0;
+	}
+
+	/*
+	 * Select rounding increment.
+	 */
+	incr = 0;
+	rmode = fpscr & FPSCR_RMODE_MASK;
+
+	if (rmode == FPSCR_ROUND_NEAREST) {
+		incr = 1ULL << VFP_DOUBLE_LOW_BITS;
+		if ((significand & (1ULL << (VFP_DOUBLE_LOW_BITS + 1))) == 0)
+			incr -= 1;
+	} else if (rmode == FPSCR_ROUND_TOZERO) {
+		incr = 0;
+	} else if ((rmode == FPSCR_ROUND_PLUSINF) ^ (vd->sign != 0))
+		incr = (1ULL << (VFP_DOUBLE_LOW_BITS + 1)) - 1;
+
+	pr_debug("VFP: rounding increment = 0x%08llx\n", incr);
+
+	/*
+	 * Is our rounding going to overflow?
+	 */
+	if ((significand + incr) < significand) {
+		exponent += 1;
+		significand = (significand >> 1) | (significand & 1);
+		incr >>= 1;
+#ifdef DEBUG
+		vd->exponent = exponent;
+		vd->significand = significand;
+		vfp_double_dump("pack: overflow", vd);
+#endif
+	}
+
+	/*
+	 * If any of the low bits (which will be shifted out of the
+	 * number) are non-zero, the result is inexact.
+	 */
+	if (significand & ((1 << (VFP_DOUBLE_LOW_BITS + 1)) - 1))
+		exceptions |= FPSCR_IXC;
+
+	/*
+	 * Do our rounding.
+	 */
+	significand += incr;
+
+	/*
+	 * Infinity?
+	 */
+	if (exponent >= 2046) {
+		exceptions |= FPSCR_OFC | FPSCR_IXC;
+		if (incr == 0) {
+			vd->exponent = 2045;
+			vd->significand = 0x7fffffffffffffffULL;
+		} else {
+			vd->exponent = 2047;		/* infinity */
+			vd->significand = 0;
+		}
+	} else {
+		if (significand >> (VFP_DOUBLE_LOW_BITS + 1) == 0)
+			exponent = 0;
+		if (exponent || significand > 0x8000000000000000ULL)
+			underflow = 0;
+		if (underflow)
+			exceptions |= FPSCR_UFC;
+		vd->exponent = exponent;
+		vd->significand = significand >> 1;
+	}
+
+ pack:
+	vfp_double_dump("pack: final", vd);
+	{
+		s64 d = vfp_double_pack(vd);
+		pr_debug("VFP: %s: d(d%d)=%016llx exceptions=%08x\n", func,
+			 dd, d, exceptions);
+		vfp_put_double(d, dd);
+	}
+	return exceptions;
+}
+
+/*
+ * Propagate the NaN, setting exceptions if it is signalling.
+ * 'n' is always a NaN.  'm' may be a number, NaN or infinity.
+ */
+static u32
+vfp_propagate_nan(struct vfp_double *vdd, struct vfp_double *vdn,
+		  struct vfp_double *vdm, u32 fpscr)
+{
+	struct vfp_double *nan;
+	int tn, tm = 0;
+
+	tn = vfp_double_type(vdn);
+
+	if (vdm)
+		tm = vfp_double_type(vdm);
+
+	if (fpscr & FPSCR_DEFAULT_NAN)
+		/*
+		 * Default NaN mode - always returns a quiet NaN
+		 */
+		nan = &vfp_double_default_qnan;
+	else {
+		/*
+		 * Contemporary mode - select the first signalling
+		 * NAN, or if neither are signalling, the first
+		 * quiet NAN.
+		 */
+		if (tn == VFP_SNAN || (tm != VFP_SNAN && tn == VFP_QNAN))
+			nan = vdn;
+		else
+			nan = vdm;
+		/*
+		 * Make the NaN quiet.
+		 */
+		nan->significand |= VFP_DOUBLE_SIGNIFICAND_QNAN;
+	}
+
+	*vdd = *nan;
+
+	/*
+	 * If one was a signalling NAN, raise invalid operation.
+	 */
+	return tn == VFP_SNAN || tm == VFP_SNAN ? FPSCR_IOC : VFP_NAN_FLAG;
+}
+
+/*
+ * Extended operations
+ */
+static u32 vfp_double_fabs(int dd, int unused, int dm, u32 fpscr)
+{
+	vfp_put_double(vfp_double_packed_abs(vfp_get_double(dm)), dd);
+	return 0;
+}
+
+static u32 vfp_double_fcpy(int dd, int unused, int dm, u32 fpscr)
+{
+	vfp_put_double(vfp_get_double(dm), dd);
+	return 0;
+}
+
+static u32 vfp_double_fneg(int dd, int unused, int dm, u32 fpscr)
+{
+	vfp_put_double(vfp_double_packed_negate(vfp_get_double(dm)), dd);
+	return 0;
+}
+
+static u32 vfp_double_fsqrt(int dd, int unused, int dm, u32 fpscr)
+{
+	struct vfp_double vdm, vdd;
+	int ret, tm;
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+	tm = vfp_double_type(&vdm);
+	if (tm & (VFP_NAN|VFP_INFINITY)) {
+		struct vfp_double *vdp = &vdd;
+
+		if (tm & VFP_NAN)
+			ret = vfp_propagate_nan(vdp, &vdm, NULL, fpscr);
+		else if (vdm.sign == 0) {
+ sqrt_copy:
+			vdp = &vdm;
+			ret = 0;
+		} else {
+ sqrt_invalid:
+			vdp = &vfp_double_default_qnan;
+			ret = FPSCR_IOC;
+		}
+		vfp_put_double(vfp_double_pack(vdp), dd);
+		return ret;
+	}
+
+	/*
+	 * sqrt(+/- 0) == +/- 0
+	 */
+	if (tm & VFP_ZERO)
+		goto sqrt_copy;
+
+	/*
+	 * Normalise a denormalised number
+	 */
+	if (tm & VFP_DENORMAL)
+		vfp_double_normalise_denormal(&vdm);
+
+	/*
+	 * sqrt(<0) = invalid
+	 */
+	if (vdm.sign)
+		goto sqrt_invalid;
+
+	vfp_double_dump("sqrt", &vdm);
+
+	/*
+	 * Estimate the square root.
+	 */
+	vdd.sign = 0;
+	vdd.exponent = ((vdm.exponent - 1023) >> 1) + 1023;
+	vdd.significand = (u64)vfp_estimate_sqrt_significand(vdm.exponent, vdm.significand >> 32) << 31;
+
+	vfp_double_dump("sqrt estimate1", &vdd);
+
+	vdm.significand >>= 1 + (vdm.exponent & 1);
+	vdd.significand += 2 + vfp_estimate_div128to64(vdm.significand, 0, vdd.significand);
+
+	vfp_double_dump("sqrt estimate2", &vdd);
+
+	/*
+	 * And now adjust.
+	 */
+	if ((vdd.significand & VFP_DOUBLE_LOW_BITS_MASK) <= 5) {
+		if (vdd.significand < 2) {
+			vdd.significand = ~0ULL;
+		} else {
+			u64 termh, terml, remh, reml;
+			vdm.significand <<= 2;
+			mul64to128(&termh, &terml, vdd.significand, vdd.significand);
+			sub128(&remh, &reml, vdm.significand, 0, termh, terml);
+			while ((s64)remh < 0) {
+				vdd.significand -= 1;
+				shift64left(&termh, &terml, vdd.significand);
+				terml |= 1;
+				add128(&remh, &reml, remh, reml, termh, terml);
+			}
+			vdd.significand |= (remh | reml) != 0;
+		}
+	}
+	vdd.significand = vfp_shiftright64jamming(vdd.significand, 1);
+
+	return vfp_double_normaliseround(dd, &vdd, fpscr, 0, "fsqrt");
+}
+
+/*
+ * Equal	:= ZC
+ * Less than	:= N
+ * Greater than	:= C
+ * Unordered	:= CV
+ */
+static u32 vfp_compare(int dd, int signal_on_qnan, int dm, u32 fpscr)
+{
+	s64 d, m;
+	u32 ret = 0;
+
+	m = vfp_get_double(dm);
+	if (vfp_double_packed_exponent(m) == 2047 && vfp_double_packed_mantissa(m)) {
+		ret |= FPSCR_C | FPSCR_V;
+		if (signal_on_qnan || !(vfp_double_packed_mantissa(m) & (1ULL << (VFP_DOUBLE_MANTISSA_BITS - 1))))
+			/*
+			 * Signalling NaN, or signalling on quiet NaN
+			 */
+			ret |= FPSCR_IOC;
+	}
+
+	d = vfp_get_double(dd);
+	if (vfp_double_packed_exponent(d) == 2047 && vfp_double_packed_mantissa(d)) {
+		ret |= FPSCR_C | FPSCR_V;
+		if (signal_on_qnan || !(vfp_double_packed_mantissa(d) & (1ULL << (VFP_DOUBLE_MANTISSA_BITS - 1))))
+			/*
+			 * Signalling NaN, or signalling on quiet NaN
+			 */
+			ret |= FPSCR_IOC;
+	}
+
+	if (ret == 0) {
+		if (d == m || vfp_double_packed_abs(d | m) == 0) {
+			/*
+			 * equal
+			 */
+			ret |= FPSCR_Z | FPSCR_C;
+		} else if (vfp_double_packed_sign(d ^ m)) {
+			/*
+			 * different signs
+			 */
+			if (vfp_double_packed_sign(d))
+				/*
+				 * d is negative, so d < m
+				 */
+				ret |= FPSCR_N;
+			else
+				/*
+				 * d is positive, so d > m
+				 */
+				ret |= FPSCR_C;
+		} else if ((vfp_double_packed_sign(d) != 0) ^ (d < m)) {
+			/*
+			 * d < m
+			 */
+			ret |= FPSCR_N;
+		} else if ((vfp_double_packed_sign(d) != 0) ^ (d > m)) {
+			/*
+			 * d > m
+			 */
+			ret |= FPSCR_C;
+		}
+	}
+
+	return ret;
+}
+
+static u32 vfp_double_fcmp(int dd, int unused, int dm, u32 fpscr)
+{
+	return vfp_compare(dd, 0, dm, fpscr);
+}
+
+static u32 vfp_double_fcmpe(int dd, int unused, int dm, u32 fpscr)
+{
+	return vfp_compare(dd, 1, dm, fpscr);
+}
+
+static u32 vfp_double_fcmpz(int dd, int unused, int dm, u32 fpscr)
+{
+	return vfp_compare(dd, 0, VFP_REG_ZERO, fpscr);
+}
+
+static u32 vfp_double_fcmpez(int dd, int unused, int dm, u32 fpscr)
+{
+	return vfp_compare(dd, 1, VFP_REG_ZERO, fpscr);
+}
+
+static u32 vfp_double_fcvts(int sd, int unused, int dm, u32 fpscr)
+{
+	struct vfp_double vdm;
+	struct vfp_single vsd;
+	int tm;
+	u32 exceptions = 0;
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+
+	tm = vfp_double_type(&vdm);
+
+	/*
+	 * If we have a signalling NaN, signal invalid operation.
+	 */
+	if (tm == VFP_SNAN)
+		exceptions = FPSCR_IOC;
+
+	if (tm & VFP_DENORMAL)
+		vfp_double_normalise_denormal(&vdm);
+
+	vsd.sign = vdm.sign;
+	vsd.significand = vfp_hi64to32jamming(vdm.significand);
+
+	/*
+	 * If we have an infinity or a NaN, the exponent must be 255
+	 */
+	if (tm & (VFP_INFINITY|VFP_NAN)) {
+		vsd.exponent = 255;
+		if (tm == VFP_QNAN)
+			vsd.significand |= VFP_SINGLE_SIGNIFICAND_QNAN;
+		goto pack_nan;
+	} else if (tm & VFP_ZERO)
+		vsd.exponent = 0;
+	else
+		vsd.exponent = vdm.exponent - (1023 - 127);
+
+	return vfp_single_normaliseround(sd, &vsd, fpscr, exceptions, "fcvts");
+
+ pack_nan:
+	vfp_put_float(vfp_single_pack(&vsd), sd);
+	return exceptions;
+}
+
+static u32 vfp_double_fuito(int dd, int unused, int dm, u32 fpscr)
+{
+	struct vfp_double vdm;
+	u32 m = vfp_get_float(dm);
+
+	vdm.sign = 0;
+	vdm.exponent = 1023 + 63 - 1;
+	vdm.significand = (u64)m;
+
+	return vfp_double_normaliseround(dd, &vdm, fpscr, 0, "fuito");
+}
+
+static u32 vfp_double_fsito(int dd, int unused, int dm, u32 fpscr)
+{
+	struct vfp_double vdm;
+	u32 m = vfp_get_float(dm);
+
+	vdm.sign = (m & 0x80000000) >> 16;
+	vdm.exponent = 1023 + 63 - 1;
+	vdm.significand = vdm.sign ? -m : m;
+
+	return vfp_double_normaliseround(dd, &vdm, fpscr, 0, "fsito");
+}
+
+static u32 vfp_double_ftoui(int sd, int unused, int dm, u32 fpscr)
+{
+	struct vfp_double vdm;
+	u32 d, exceptions = 0;
+	int rmode = fpscr & FPSCR_RMODE_MASK;
+	int tm;
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+
+	/*
+	 * Do we have a denormalised number?
+	 */
+	tm = vfp_double_type(&vdm);
+	if (tm & VFP_DENORMAL)
+		exceptions |= FPSCR_IDC;
+
+	if (tm & VFP_NAN)
+		vdm.sign = 0;
+
+	if (vdm.exponent >= 1023 + 32) {
+		d = vdm.sign ? 0 : 0xffffffff;
+		exceptions = FPSCR_IOC;
+	} else if (vdm.exponent >= 1023 - 1) {
+		int shift = 1023 + 63 - vdm.exponent;
+		u64 rem, incr = 0;
+
+		/*
+		 * 2^0 <= m < 2^32-2^8
+		 */
+		d = (vdm.significand << 1) >> shift;
+		rem = vdm.significand << (65 - shift);
+
+		if (rmode == FPSCR_ROUND_NEAREST) {
+			incr = 0x8000000000000000ULL;
+			if ((d & 1) == 0)
+				incr -= 1;
+		} else if (rmode == FPSCR_ROUND_TOZERO) {
+			incr = 0;
+		} else if ((rmode == FPSCR_ROUND_PLUSINF) ^ (vdm.sign != 0)) {
+			incr = ~0ULL;
+		}
+
+		if ((rem + incr) < rem) {
+			if (d < 0xffffffff)
+				d += 1;
+			else
+				exceptions |= FPSCR_IOC;
+		}
+
+		if (d && vdm.sign) {
+			d = 0;
+			exceptions |= FPSCR_IOC;
+		} else if (rem)
+			exceptions |= FPSCR_IXC;
+	} else {
+		d = 0;
+		if (vdm.exponent | vdm.significand) {
+			exceptions |= FPSCR_IXC;
+			if (rmode == FPSCR_ROUND_PLUSINF && vdm.sign == 0)
+				d = 1;
+			else if (rmode == FPSCR_ROUND_MINUSINF && vdm.sign) {
+				d = 0;
+				exceptions |= FPSCR_IOC;
+			}
+		}
+	}
+
+	pr_debug("VFP: ftoui: d(s%d)=%08x exceptions=%08x\n", sd, d, exceptions);
+
+	vfp_put_float(d, sd);
+
+	return exceptions;
+}
+
+static u32 vfp_double_ftouiz(int sd, int unused, int dm, u32 fpscr)
+{
+	return vfp_double_ftoui(sd, unused, dm, FPSCR_ROUND_TOZERO);
+}
+
+static u32 vfp_double_ftosi(int sd, int unused, int dm, u32 fpscr)
+{
+	struct vfp_double vdm;
+	u32 d, exceptions = 0;
+	int rmode = fpscr & FPSCR_RMODE_MASK;
+	int tm;
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+	vfp_double_dump("VDM", &vdm);
+
+	/*
+	 * Do we have denormalised number?
+	 */
+	tm = vfp_double_type(&vdm);
+	if (tm & VFP_DENORMAL)
+		exceptions |= FPSCR_IDC;
+
+	if (tm & VFP_NAN) {
+		d = 0;
+		exceptions |= FPSCR_IOC;
+	} else if (vdm.exponent >= 1023 + 32) {
+		d = 0x7fffffff;
+		if (vdm.sign)
+			d = ~d;
+		exceptions |= FPSCR_IOC;
+	} else if (vdm.exponent >= 1023 - 1) {
+		int shift = 1023 + 63 - vdm.exponent;	/* 58 */
+		u64 rem, incr = 0;
+
+		d = (vdm.significand << 1) >> shift;
+		rem = vdm.significand << (65 - shift);
+
+		if (rmode == FPSCR_ROUND_NEAREST) {
+			incr = 0x8000000000000000ULL;
+			if ((d & 1) == 0)
+				incr -= 1;
+		} else if (rmode == FPSCR_ROUND_TOZERO) {
+			incr = 0;
+		} else if ((rmode == FPSCR_ROUND_PLUSINF) ^ (vdm.sign != 0)) {
+			incr = ~0ULL;
+		}
+
+		if ((rem + incr) < rem && d < 0xffffffff)
+			d += 1;
+		if (d > 0x7fffffff + (vdm.sign != 0)) {
+			d = 0x7fffffff + (vdm.sign != 0);
+			exceptions |= FPSCR_IOC;
+		} else if (rem)
+			exceptions |= FPSCR_IXC;
+
+		if (vdm.sign)
+			d = -d;
+	} else {
+		d = 0;
+		if (vdm.exponent | vdm.significand) {
+			exceptions |= FPSCR_IXC;
+			if (rmode == FPSCR_ROUND_PLUSINF && vdm.sign == 0)
+				d = 1;
+			else if (rmode == FPSCR_ROUND_MINUSINF && vdm.sign)
+				d = -1;
+		}
+	}
+
+	pr_debug("VFP: ftosi: d(s%d)=%08x exceptions=%08x\n", sd, d, exceptions);
+
+	vfp_put_float((s32)d, sd);
+
+	return exceptions;
+}
+
+static u32 vfp_double_ftosiz(int dd, int unused, int dm, u32 fpscr)
+{
+	return vfp_double_ftosi(dd, unused, dm, FPSCR_ROUND_TOZERO);
+}
+
+
+static struct op fops_ext[32] = {
+	[FEXT_TO_IDX(FEXT_FCPY)]	= { vfp_double_fcpy,   0 },
+	[FEXT_TO_IDX(FEXT_FABS)]	= { vfp_double_fabs,   0 },
+	[FEXT_TO_IDX(FEXT_FNEG)]	= { vfp_double_fneg,   0 },
+	[FEXT_TO_IDX(FEXT_FSQRT)]	= { vfp_double_fsqrt,  0 },
+	[FEXT_TO_IDX(FEXT_FCMP)]	= { vfp_double_fcmp,   OP_SCALAR },
+	[FEXT_TO_IDX(FEXT_FCMPE)]	= { vfp_double_fcmpe,  OP_SCALAR },
+	[FEXT_TO_IDX(FEXT_FCMPZ)]	= { vfp_double_fcmpz,  OP_SCALAR },
+	[FEXT_TO_IDX(FEXT_FCMPEZ)]	= { vfp_double_fcmpez, OP_SCALAR },
+	[FEXT_TO_IDX(FEXT_FCVT)]	= { vfp_double_fcvts,  OP_SCALAR|OP_SD },
+	[FEXT_TO_IDX(FEXT_FUITO)]	= { vfp_double_fuito,  OP_SCALAR|OP_SM },
+	[FEXT_TO_IDX(FEXT_FSITO)]	= { vfp_double_fsito,  OP_SCALAR|OP_SM },
+	[FEXT_TO_IDX(FEXT_FTOUI)]	= { vfp_double_ftoui,  OP_SCALAR|OP_SD },
+	[FEXT_TO_IDX(FEXT_FTOUIZ)]	= { vfp_double_ftouiz, OP_SCALAR|OP_SD },
+	[FEXT_TO_IDX(FEXT_FTOSI)]	= { vfp_double_ftosi,  OP_SCALAR|OP_SD },
+	[FEXT_TO_IDX(FEXT_FTOSIZ)]	= { vfp_double_ftosiz, OP_SCALAR|OP_SD },
+};
+
+
+
+
+static u32
+vfp_double_fadd_nonnumber(struct vfp_double *vdd, struct vfp_double *vdn,
+			  struct vfp_double *vdm, u32 fpscr)
+{
+	struct vfp_double *vdp;
+	u32 exceptions = 0;
+	int tn, tm;
+
+	tn = vfp_double_type(vdn);
+	tm = vfp_double_type(vdm);
+
+	if (tn & tm & VFP_INFINITY) {
+		/*
+		 * Two infinities.  Are they different signs?
+		 */
+		if (vdn->sign ^ vdm->sign) {
+			/*
+			 * different signs -> invalid
+			 */
+			exceptions = FPSCR_IOC;
+			vdp = &vfp_double_default_qnan;
+		} else {
+			/*
+			 * same signs -> valid
+			 */
+			vdp = vdn;
+		}
+	} else if (tn & VFP_INFINITY && tm & VFP_NUMBER) {
+		/*
+		 * One infinity and one number -> infinity
+		 */
+		vdp = vdn;
+	} else {
+		/*
+		 * 'n' is a NaN of some type
+		 */
+		return vfp_propagate_nan(vdd, vdn, vdm, fpscr);
+	}
+	*vdd = *vdp;
+	return exceptions;
+}
+
+static u32
+vfp_double_add(struct vfp_double *vdd, struct vfp_double *vdn,
+	       struct vfp_double *vdm, u32 fpscr)
+{
+	u32 exp_diff;
+	u64 m_sig;
+
+	if (vdn->significand & (1ULL << 63) ||
+	    vdm->significand & (1ULL << 63)) {
+		pr_info("VFP: bad FP values in %s\n", __func__);
+		vfp_double_dump("VDN", vdn);
+		vfp_double_dump("VDM", vdm);
+	}
+
+	/*
+	 * Ensure that 'n' is the largest magnitude number.  Note that
+	 * if 'n' and 'm' have equal exponents, we do not swap them.
+	 * This ensures that NaN propagation works correctly.
+	 */
+	if (vdn->exponent < vdm->exponent) {
+		struct vfp_double *t = vdn;
+		vdn = vdm;
+		vdm = t;
+	}
+
+	/*
+	 * Is 'n' an infinity or a NaN?  Note that 'm' may be a number,
+	 * infinity or a NaN here.
+	 */
+	if (vdn->exponent == 2047)
+		return vfp_double_fadd_nonnumber(vdd, vdn, vdm, fpscr);
+
+	/*
+	 * We have two proper numbers, where 'vdn' is the larger magnitude.
+	 *
+	 * Copy 'n' to 'd' before doing the arithmetic.
+	 */
+	*vdd = *vdn;
+
+	/*
+	 * Align 'm' with the result.
+	 */
+	exp_diff = vdn->exponent - vdm->exponent;
+	m_sig = vfp_shiftright64jamming(vdm->significand, exp_diff);
+
+	/*
+	 * If the signs are different, we are really subtracting.
+	 */
+	if (vdn->sign ^ vdm->sign) {
+		m_sig = vdn->significand - m_sig;
+		if ((s64)m_sig < 0) {
+			vdd->sign = vfp_sign_negate(vdd->sign);
+			m_sig = -m_sig;
+		} else if (m_sig == 0) {
+			vdd->sign = (fpscr & FPSCR_RMODE_MASK) ==
+				      FPSCR_ROUND_MINUSINF ? 0x8000 : 0;
+		}
+	} else {
+		m_sig += vdn->significand;
+	}
+	vdd->significand = m_sig;
+
+	return 0;
+}
+
+static u32
+vfp_double_multiply(struct vfp_double *vdd, struct vfp_double *vdn,
+		    struct vfp_double *vdm, u32 fpscr)
+{
+	vfp_double_dump("VDN", vdn);
+	vfp_double_dump("VDM", vdm);
+
+	/*
+	 * Ensure that 'n' is the largest magnitude number.  Note that
+	 * if 'n' and 'm' have equal exponents, we do not swap them.
+	 * This ensures that NaN propagation works correctly.
+	 */
+	if (vdn->exponent < vdm->exponent) {
+		struct vfp_double *t = vdn;
+		vdn = vdm;
+		vdm = t;
+		pr_debug("VFP: swapping M <-> N\n");
+	}
+
+	vdd->sign = vdn->sign ^ vdm->sign;
+
+	/*
+	 * If 'n' is an infinity or NaN, handle it.  'm' may be anything.
+	 */
+	if (vdn->exponent == 2047) {
+		if (vdn->significand || (vdm->exponent == 2047 && vdm->significand))
+			return vfp_propagate_nan(vdd, vdn, vdm, fpscr);
+		if ((vdm->exponent | vdm->significand) == 0) {
+			*vdd = vfp_double_default_qnan;
+			return FPSCR_IOC;
+		}
+		vdd->exponent = vdn->exponent;
+		vdd->significand = 0;
+		return 0;
+	}
+
+	/*
+	 * If 'm' is zero, the result is always zero.  In this case,
+	 * 'n' may be zero or a number, but it doesn't matter which.
+	 */
+	if ((vdm->exponent | vdm->significand) == 0) {
+		vdd->exponent = 0;
+		vdd->significand = 0;
+		return 0;
+	}
+
+	/*
+	 * We add 2 to the destination exponent for the same reason
+	 * as the addition case - though this time we have +1 from
+	 * each input operand.
+	 */
+	vdd->exponent = vdn->exponent + vdm->exponent - 1023 + 2;
+	vdd->significand = vfp_hi64multiply64(vdn->significand, vdm->significand);
+
+	vfp_double_dump("VDD", vdd);
+	return 0;
+}
+
+#define NEG_MULTIPLY	(1 << 0)
+#define NEG_SUBTRACT	(1 << 1)
+
+static u32
+vfp_double_multiply_accumulate(int dd, int dn, int dm, u32 fpscr, u32 negate, char *func)
+{
+	struct vfp_double vdd, vdp, vdn, vdm;
+	u32 exceptions;
+
+	vfp_double_unpack(&vdn, vfp_get_double(dn));
+	if (vdn.exponent == 0 && vdn.significand)
+		vfp_double_normalise_denormal(&vdn);
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+	if (vdm.exponent == 0 && vdm.significand)
+		vfp_double_normalise_denormal(&vdm);
+
+	exceptions = vfp_double_multiply(&vdp, &vdn, &vdm, fpscr);
+	if (negate & NEG_MULTIPLY)
+		vdp.sign = vfp_sign_negate(vdp.sign);
+
+	vfp_double_unpack(&vdn, vfp_get_double(dd));
+	if (vdn.exponent == 0 && vdn.significand)
+		vfp_double_normalise_denormal(&vdn);
+	if (negate & NEG_SUBTRACT)
+		vdn.sign = vfp_sign_negate(vdn.sign);
+
+	exceptions |= vfp_double_add(&vdd, &vdn, &vdp, fpscr);
+
+	return vfp_double_normaliseround(dd, &vdd, fpscr, exceptions, func);
+}
+
+/*
+ * Standard operations
+ */
+
+/*
+ * sd = sd + (sn * sm)
+ */
+static u32 vfp_double_fmac(int dd, int dn, int dm, u32 fpscr)
+{
+	return vfp_double_multiply_accumulate(dd, dn, dm, fpscr, 0, "fmac");
+}
+
+/*
+ * sd = sd - (sn * sm)
+ */
+static u32 vfp_double_fnmac(int dd, int dn, int dm, u32 fpscr)
+{
+	return vfp_double_multiply_accumulate(dd, dn, dm, fpscr, NEG_MULTIPLY, "fnmac");
+}
+
+/*
+ * sd = -sd + (sn * sm)
+ */
+static u32 vfp_double_fmsc(int dd, int dn, int dm, u32 fpscr)
+{
+	return vfp_double_multiply_accumulate(dd, dn, dm, fpscr, NEG_SUBTRACT, "fmsc");
+}
+
+/*
+ * sd = -sd - (sn * sm)
+ */
+static u32 vfp_double_fnmsc(int dd, int dn, int dm, u32 fpscr)
+{
+	return vfp_double_multiply_accumulate(dd, dn, dm, fpscr, NEG_SUBTRACT | NEG_MULTIPLY, "fnmsc");
+}
+
+/*
+ * sd = sn * sm
+ */
+static u32 vfp_double_fmul(int dd, int dn, int dm, u32 fpscr)
+{
+	struct vfp_double vdd, vdn, vdm;
+	u32 exceptions;
+
+	vfp_double_unpack(&vdn, vfp_get_double(dn));
+	if (vdn.exponent == 0 && vdn.significand)
+		vfp_double_normalise_denormal(&vdn);
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+	if (vdm.exponent == 0 && vdm.significand)
+		vfp_double_normalise_denormal(&vdm);
+
+	exceptions = vfp_double_multiply(&vdd, &vdn, &vdm, fpscr);
+	return vfp_double_normaliseround(dd, &vdd, fpscr, exceptions, "fmul");
+}
+
+/*
+ * sd = -(sn * sm)
+ */
+static u32 vfp_double_fnmul(int dd, int dn, int dm, u32 fpscr)
+{
+	struct vfp_double vdd, vdn, vdm;
+	u32 exceptions;
+
+	vfp_double_unpack(&vdn, vfp_get_double(dn));
+	if (vdn.exponent == 0 && vdn.significand)
+		vfp_double_normalise_denormal(&vdn);
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+	if (vdm.exponent == 0 && vdm.significand)
+		vfp_double_normalise_denormal(&vdm);
+
+	exceptions = vfp_double_multiply(&vdd, &vdn, &vdm, fpscr);
+	vdd.sign = vfp_sign_negate(vdd.sign);
+
+	return vfp_double_normaliseround(dd, &vdd, fpscr, exceptions, "fnmul");
+}
+
+/*
+ * sd = sn + sm
+ */
+static u32 vfp_double_fadd(int dd, int dn, int dm, u32 fpscr)
+{
+	struct vfp_double vdd, vdn, vdm;
+	u32 exceptions;
+
+	vfp_double_unpack(&vdn, vfp_get_double(dn));
+	if (vdn.exponent == 0 && vdn.significand)
+		vfp_double_normalise_denormal(&vdn);
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+	if (vdm.exponent == 0 && vdm.significand)
+		vfp_double_normalise_denormal(&vdm);
+
+	exceptions = vfp_double_add(&vdd, &vdn, &vdm, fpscr);
+
+	return vfp_double_normaliseround(dd, &vdd, fpscr, exceptions, "fadd");
+}
+
+/*
+ * sd = sn - sm
+ */
+static u32 vfp_double_fsub(int dd, int dn, int dm, u32 fpscr)
+{
+	struct vfp_double vdd, vdn, vdm;
+	u32 exceptions;
+
+	vfp_double_unpack(&vdn, vfp_get_double(dn));
+	if (vdn.exponent == 0 && vdn.significand)
+		vfp_double_normalise_denormal(&vdn);
+
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+	if (vdm.exponent == 0 && vdm.significand)
+		vfp_double_normalise_denormal(&vdm);
+
+	/*
+	 * Subtraction is like addition, but with a negated operand.
+	 */
+	vdm.sign = vfp_sign_negate(vdm.sign);
+
+	exceptions = vfp_double_add(&vdd, &vdn, &vdm, fpscr);
+
+	return vfp_double_normaliseround(dd, &vdd, fpscr, exceptions, "fsub");
+}
+
+/*
+ * sd = sn / sm
+ */
+static u32 vfp_double_fdiv(int dd, int dn, int dm, u32 fpscr)
+{
+	struct vfp_double vdd, vdn, vdm;
+	u32 exceptions = 0;
+	int tm, tn;
+
+	vfp_double_unpack(&vdn, vfp_get_double(dn));
+	vfp_double_unpack(&vdm, vfp_get_double(dm));
+
+	vdd.sign = vdn.sign ^ vdm.sign;
+
+	tn = vfp_double_type(&vdn);
+	tm = vfp_double_type(&vdm);
+
+	/*
+	 * Is n a NAN?
+	 */
+	if (tn & VFP_NAN)
+		goto vdn_nan;
+
+	/*
+	 * Is m a NAN?
+	 */
+	if (tm & VFP_NAN)
+		goto vdm_nan;
+
+	/*
+	 * If n and m are infinity, the result is invalid
+	 * If n and m are zero, the result is invalid
+	 */
+	if (tm & tn & (VFP_INFINITY|VFP_ZERO))
+		goto invalid;
+
+	/*
+	 * If n is infinity, the result is infinity
+	 */
+	if (tn & VFP_INFINITY)
+		goto infinity;
+
+	/*
+	 * If m is zero, raise div0 exceptions
+	 */
+	if (tm & VFP_ZERO)
+		goto divzero;
+
+	/*
+	 * If m is infinity, or n is zero, the result is zero
+	 */
+	if (tm & VFP_INFINITY || tn & VFP_ZERO)
+		goto zero;
+
+	if (tn & VFP_DENORMAL)
+		vfp_double_normalise_denormal(&vdn);
+	if (tm & VFP_DENORMAL)
+		vfp_double_normalise_denormal(&vdm);
+
+	/*
+	 * Ok, we have two numbers, we can perform division.
+	 */
+	vdd.exponent = vdn.exponent - vdm.exponent + 1023 - 1;
+	vdm.significand <<= 1;
+	if (vdm.significand <= (2 * vdn.significand)) {
+		vdn.significand >>= 1;
+		vdd.exponent++;
+	}
+	vdd.significand = vfp_estimate_div128to64(vdn.significand, 0, vdm.significand);
+	if ((vdd.significand & 0x1ff) <= 2) {
+		u64 termh, terml, remh, reml;
+		mul64to128(&termh, &terml, vdm.significand, vdd.significand);
+		sub128(&remh, &reml, vdn.significand, 0, termh, terml);
+		while ((s64)remh < 0) {
+			vdd.significand -= 1;
+			add128(&remh, &reml, remh, reml, 0, vdm.significand);
+		}
+		vdd.significand |= (reml != 0);
+	}
+	return vfp_double_normaliseround(dd, &vdd, fpscr, 0, "fdiv");
+
+ vdn_nan:
+	exceptions = vfp_propagate_nan(&vdd, &vdn, &vdm, fpscr);
+ pack:
+	vfp_put_double(vfp_double_pack(&vdd), dd);
+	return exceptions;
+
+ vdm_nan:
+	exceptions = vfp_propagate_nan(&vdd, &vdm, &vdn, fpscr);
+	goto pack;
+
+ zero:
+	vdd.exponent = 0;
+	vdd.significand = 0;
+	goto pack;
+
+ divzero:
+	exceptions = FPSCR_DZC;
+ infinity:
+	vdd.exponent = 2047;
+	vdd.significand = 0;
+	goto pack;
+
+ invalid:
+	vfp_put_double(vfp_double_pack(&vfp_double_default_qnan), dd);
+	return FPSCR_IOC;
+}
+
+static struct op fops[16] = {
+	[FOP_TO_IDX(FOP_FMAC)]	= { vfp_double_fmac,  0 },
+	[FOP_TO_IDX(FOP_FNMAC)]	= { vfp_double_fnmac, 0 },
+	[FOP_TO_IDX(FOP_FMSC)]	= { vfp_double_fmsc,  0 },
+	[FOP_TO_IDX(FOP_FNMSC)]	= { vfp_double_fnmsc, 0 },
+	[FOP_TO_IDX(FOP_FMUL)]	= { vfp_double_fmul,  0 },
+	[FOP_TO_IDX(FOP_FNMUL)]	= { vfp_double_fnmul, 0 },
+	[FOP_TO_IDX(FOP_FADD)]	= { vfp_double_fadd,  0 },
+	[FOP_TO_IDX(FOP_FSUB)]	= { vfp_double_fsub,  0 },
+	[FOP_TO_IDX(FOP_FDIV)]	= { vfp_double_fdiv,  0 },
+};
+
+#define FREG_BANK(x)	((x) & 0x0c)
+#define FREG_IDX(x)	((x) & 3)
+
+u32 vfp_double_cpdo(u32 inst, u32 fpscr)
+{
+	u32 op = inst & FOP_MASK;
+	u32 exceptions = 0;
+	unsigned int dest;
+	unsigned int dn = vfp_get_dn(inst);
+	unsigned int dm;
+	unsigned int vecitr, veclen, vecstride;
+	struct op *fop;
+
+	vecstride = (1 + ((fpscr & FPSCR_STRIDE_MASK) == FPSCR_STRIDE_MASK));
+
+	fop = (op == FOP_EXT) ? &fops_ext[FEXT_TO_IDX(inst)] : &fops[FOP_TO_IDX(op)];
+
+	/*
+	 * fcvtds takes an sN register number as destination, not dN.
+	 * It also always operates on scalars.
+	 */
+	if (fop->flags & OP_SD)
+		dest = vfp_get_sd(inst);
+	else
+		dest = vfp_get_dd(inst);
+
+	/*
+	 * f[us]ito takes a sN operand, not a dN operand.
+	 */
+	if (fop->flags & OP_SM)
+		dm = vfp_get_sm(inst);
+	else
+		dm = vfp_get_dm(inst);
+
+	/*
+	 * If destination bank is zero, vector length is always '1'.
+	 * ARM DDI0100F C5.1.3, C5.3.2.
+	 */
+	if ((fop->flags & OP_SCALAR) || (FREG_BANK(dest) == 0))
+		veclen = 0;
+	else
+		veclen = fpscr & FPSCR_LENGTH_MASK;
+
+	pr_debug("VFP: vecstride=%u veclen=%u\n", vecstride,
+		 (veclen >> FPSCR_LENGTH_BIT) + 1);
+
+	if (!fop->fn)
+		goto invalid;
+
+	for (vecitr = 0; vecitr <= veclen; vecitr += 1 << FPSCR_LENGTH_BIT) {
+		u32 except;
+		char type;
+
+		type = fop->flags & OP_SD ? 's' : 'd';
+		if (op == FOP_EXT)
+			pr_debug("VFP: itr%d (%c%u) = op[%u] (d%u)\n",
+				 vecitr >> FPSCR_LENGTH_BIT,
+				 type, dest, dn, dm);
+		else
+			pr_debug("VFP: itr%d (%c%u) = (d%u) op[%u] (d%u)\n",
+				 vecitr >> FPSCR_LENGTH_BIT,
+				 type, dest, dn, FOP_TO_IDX(op), dm);
+
+		except = fop->fn(dest, dn, dm, fpscr);
+		pr_debug("VFP: itr%d: exceptions=%08x\n",
+			 vecitr >> FPSCR_LENGTH_BIT, except);
+
+		exceptions |= except;
+
+		/*
+		 * CHECK: It appears to be undefined whether we stop when
+		 * we encounter an exception.  We continue.
+		 */
+		dest = FREG_BANK(dest) + ((FREG_IDX(dest) + vecstride) & 3);
+		dn = FREG_BANK(dn) + ((FREG_IDX(dn) + vecstride) & 3);
+		if (FREG_BANK(dm) != 0)
+			dm = FREG_BANK(dm) + ((FREG_IDX(dm) + vecstride) & 3);
+	}
+	return exceptions;
+
+ invalid:
+	return ~0;
+}