altos: Rename 'core' to 'kernel'

[fw/altos] / src / kernel / ao_int64.c

diff --git a/src/kernel/ao_int64.c b/src/kernel/ao_int64.c
new file mode 100644 (file)
index 0000000..aa23dbe
--- /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);
+}