Add a few ops to check out some basic arithmetic functions; seems to …

…work.

src/ops/nqp_bigint.ops

@@ -7,11 +7,46 @@ BEGIN_OPS_PREAMBLE
 #include "../6model/sixmodelobject.h"
 #include "../6model/reprs/P6bigint.h"
 
+static mp_int * get_bigint(PARROT_INTERP, PMC *obj) {
+    /* XXX sanity checks... */
+    return &((P6bigintInstance *)PMC_data(obj))->i;
+}
+
 END_OPS_PREAMBLE
 
+/*
+ * The ops in here mostly just delegate off to libtommath. nqp_bigint_setup must be
+ * called before you create any types using the bigint representation. For all of the
+ * rest ops there are two variants. The first variant simply takes two objects and
+ * assumes they directly use the P6bigint REPR; the second one pulls out an (inlined)
+ * P6bigint attribute and works on that; this avoids the overhead of creating a boxed
+ * version only to throw it away again.
+ */
+
 inline op nqp_bigint_setup() :base_core {
     /* Register the bigint representation. */
     REGISTER_DYNAMIC_REPR(interp,
         Parrot_str_new_constant(interp, "P6bigint"),
         P6bigint_initialize);
 }
+
+inline op nqp_bigint_add(out PMC, in PMC, in PMC) :base_core {
+    mp_int *a = get_bigint(interp, $2);
+    mp_int *b = get_bigint(interp, $3);
+    $1 = REPR($2)->instance_of(interp, $2);
+    mp_add(a, b, get_bigint(interp, $1));
+}
+
+inline op nqp_bigint_sub(out PMC, in PMC, in PMC) :base_core {
+    mp_int *a = get_bigint(interp, $2);
+    mp_int *b = get_bigint(interp, $3);
+    $1 = REPR($2)->instance_of(interp, $2);
+    mp_sub(a, b, get_bigint(interp, $1));
+}
+
+inline op nqp_bigint_mul(out PMC, in PMC, in PMC) :base_core {
+    mp_int *a = get_bigint(interp, $2);
+    mp_int *b = get_bigint(interp, $3);
+    $1 = REPR($2)->instance_of(interp, $2);
+    mp_mul(a, b, get_bigint(interp, $1));
+}