X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=src%2Fkernel%2Fao_int64.c;fp=src%2Fkernel%2Fao_int64.c;h=aa23dbe0f9cc27d37ff7a821cb20ec8f5c64105f;hp=0000000000000000000000000000000000000000;hb=24167015705ae831692b95735968b04a876f935e;hpb=bb9fdef607728cc326a82aa632e59724f272e53b

diff --git a/src/kernel/ao_int64.c b/src/kernel/ao_int64.c
new file mode 100644
index 00000000..aa23dbe0
--- /dev/null
+++ b/src/kernel/ao_int64.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright © 2013 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <ao_int64.h>
+
+__pdata ao_int64_t *__data ao_64r, *__data ao_64a, *__data ao_64b;
+
+void ao_plus64(__pdata ao_int64_t *r, __pdata ao_int64_t *a, __pdata ao_int64_t *b) __FATTR {
+	__LOCAL uint32_t	t;
+
+	r->high = a->high + b->high;
+	t = a->low + b->low;
+	if (t < a->low)
+		r->high++;
+	r->low = t;
+}
+
+void ao_minus64(__pdata ao_int64_t *r, __pdata ao_int64_t *a, __pdata ao_int64_t *b) __FATTR {
+	__LOCAL uint32_t	t;
+
+	r->high = a->high - b->high;
+	t = a->low - b->low;
+	if (t > a->low)
+		r->high--;
+	r->low = t;
+}
+
+void ao_rshift64(__pdata ao_int64_t *r, __pdata ao_int64_t *a, uint8_t d) __FATTR {
+	if (d < 32) {
+		r->low = a->low >> d;
+		if (d)
+			r->low |= a->high << (32 - d);
+		r->high = (int32_t) a->high >> d;
+	} else {
+		d &= 0x1f;
+		r->low = (int32_t) a->high >> d;
+		r->high = 0;
+	}
+}
+
+void ao_lshift64(__pdata ao_int64_t *r, __pdata ao_int64_t *a, uint8_t d) __FATTR {
+	if (d < 32) {
+		r->high = a->high << d;
+		if (d)
+			r->high |= a->low >> (32 - d);
+		r->low = a->low << d;
+	} else {
+		d &= 0x1f;
+		r->high = a->low << d;
+		r->low = 0;
+	}
+}
+
+static void ao_umul64_32_32(__ARG ao_int64_t *r, uint32_t a, uint32_t b) __reentrant {
+	__LOCAL uint32_t	s;
+	__LOCAL ao_int64_t	t;
+	r->low = (uint32_t) (uint16_t) a * (uint16_t) b;
+	r->high = (uint32_t) (uint16_t) (a >> 16) * (uint16_t) (b >> 16);
+
+	s = (uint32_t) (uint16_t) (a >> 16) * (uint16_t) b;
+
+	t.high = s >> 16;
+	t.low = s << 16;
+	ao_plus64(r, r, &t);
+
+	s = (uint32_t) (uint16_t) a * (uint16_t) (b >> 16);
+
+	t.high = s >> 16;
+	t.low = s << 16;
+	ao_plus64(r, r, &t);
+}
+
+void ao_neg64(__pdata ao_int64_t *r, __pdata ao_int64_t *a) __FATTR {
+	r->high = ~a->high;
+	if (!(r->low = ~a->low + 1))
+		r->high++;
+}
+
+void ao_mul64_32_32(__ARG ao_int64_t *r, int32_t a, int32_t b) __FATTR {
+	uint8_t		negative = 0;
+
+	if (a < 0) {
+		a = -a;
+		++negative;
+	}
+	if (b < 0) {
+		b = -b;
+		--negative;
+	}
+	ao_umul64_32_32(r, a, b);
+	if (negative)
+		ao_neg64(r, r);
+}
+
+static void ao_umul64(__ARG ao_int64_t *r, __ARG ao_int64_t *a, __ARG ao_int64_t *b) __reentrant {
+	__LOCAL ao_int64_t	r2, r3;
+
+	ao_umul64_32_32(&r2, a->high, b->low);
+	ao_umul64_32_32(&r3, a->low, b->high);
+	ao_umul64_32_32(r, a->low, b->low);
+
+	r->high += r2.low + r3.low;
+}
+
+static __ARG ao_int64_t	ap, bp;
+
+void ao_mul64(__ARG ao_int64_t *r, __ARG ao_int64_t *a, __ARG ao_int64_t *b) __FATTR {
+	uint8_t	negative = 0;
+
+	if (ao_int64_negativep(a)) {
+		ao_neg64(&ap, a);
+		a = &ap;
+		++negative;
+	}
+	if (ao_int64_negativep(b)) {
+		ao_neg64(&bp, b);
+		b = &bp;
+		--negative;
+	}
+	ao_umul64(r, a, b);
+	if (negative)
+		ao_neg64(r, r);
+}
+
+static void ao_umul64_64_16(__ARG ao_int64_t *r, __ARG ao_int64_t *a, uint16_t b) __reentrant {
+	__LOCAL uint32_t h;
+
+	h = a->high * b;
+	ao_umul64_32_32(r, a->low, b);
+	r->high += h;
+}
+
+void ao_mul64_64_16(__ARG ao_int64_t *r, __ARG ao_int64_t *a, __ARG uint16_t b) __FATTR {
+	uint8_t		negative = 0;
+
+	if ((int32_t) a->high < 0) {
+		ao_neg64(&ap, a);
+		a = &ap;
+		negative++;
+	} else
+		ao_umul64_64_16(r, a, b);
+	if (negative)
+		ao_neg64(r, r);
+}