1 files changed, 148 insertions, 0 deletions
diff --git a/opcodes/cgen-opc.c b/opcodes/cgen-opc.c
index d34aac8..dbc5175 100644
--- a/opcodes/cgen-opc.c
+++ b/opcodes/cgen-opc.c
@@ -613,3 +613,151 @@ cgen_signed_overflow_ok_p (CGEN_CPU_DESC cd)
 {
   return cd->signed_overflow_ok_p;
 }
+/* Functions for manipulating CGEN_BITSET.  */
+
+/* Create a bit mask.  */
+CGEN_BITSET *
+cgen_bitset_create (unsigned bit_count)
+{
+  CGEN_BITSET * mask = xmalloc (sizeof (* mask));
+  cgen_bitset_init (mask, bit_count);
+  return mask;
+}
+
+/* Initialize an existing bit mask.  */
+
+void
+cgen_bitset_init (CGEN_BITSET * mask, unsigned bit_count)
+{
+  if (! mask)
+    return;
+  mask->length = (bit_count / 8) + 1;
+  mask->bits = xmalloc (mask->length);
+  cgen_bitset_clear (mask);
+}
+
+/* Clear the bits of a bit mask.  */
+
+void
+cgen_bitset_clear (CGEN_BITSET * mask)
+{
+  unsigned i;
+
+  if (! mask)
+    return;
+
+  for (i = 0; i < mask->length; ++i)
+    mask->bits[i] = 0;
+}
+
+/* Add a bit to a bit mask.  */
+
+void
+cgen_bitset_add (CGEN_BITSET * mask, unsigned bit_num)
+{
+  int byte_ix, bit_ix;
+  int bit_mask;
+
+  if (! mask)
+    return;
+  byte_ix = bit_num / 8;
+  bit_ix = bit_num % 8;
+  bit_mask = 1 << (7 - bit_ix);
+  mask->bits[byte_ix] |= bit_mask;
+}
+
+/* Set a bit mask.  */
+
+void
+cgen_bitset_set (CGEN_BITSET * mask, unsigned bit_num)
+{
+  if (! mask)
+    return;
+  cgen_bitset_clear (mask);
+  cgen_bitset_add (mask, bit_num);
+}
+
+/* Test for a bit in a bit mask.
+   Returns 1 if the bit is found  */
+
+int
+cgen_bitset_contains (CGEN_BITSET * mask, unsigned bit_num)
+{
+  int byte_ix, bit_ix;
+  int bit_mask;
+
+  if (! mask)
+    return 1; /* No bit restrictions.  */
+
+  byte_ix = bit_num / 8;
+  bit_ix = 7 - (bit_num % 8);
+  bit_mask = 1 << bit_ix;
+  return (mask->bits[byte_ix] & bit_mask) >> bit_ix;
+}
+
+/* Compare two bit masks for equality.
+   Returns 0 if they are equal.  */
+
+int
+cgen_bitset_compare (CGEN_BITSET * mask1, CGEN_BITSET * mask2)
+{
+  if (mask1 == mask2)
+    return 0;
+  if (! mask1 || ! mask2)
+    return 1;
+  if (mask1->length != mask2->length)
+    return 1;
+  return memcmp (mask1->bits, mask2->bits, mask1->length);
+}
+
+/* Test two bit masks for common bits.
+   Returns 1 if a common bit is found.  */
+
+int
+cgen_bitset_intersect_p (CGEN_BITSET * mask1, CGEN_BITSET * mask2)
+{
+  unsigned i, limit;
+
+  if (mask1 == mask2)
+    return 1;
+  if (! mask1 || ! mask2)
+    return 0;
+  limit = mask1->length < mask2->length ? mask1->length : mask2->length;
+
+  for (i = 0; i < limit; ++i)
+    if ((mask1->bits[i] & mask2->bits[i]))
+      return 1;
+
+  return 0;
+}
+
+/* Make a copy of a bit mask.  */
+
+CGEN_BITSET *
+cgen_bitset_copy (CGEN_BITSET * mask)
+{
+  CGEN_BITSET* newmask;
+
+  if (! mask)
+    return NULL;
+  newmask = cgen_bitset_create ((mask->length * 8) - 1);
+  memcpy (newmask->bits, mask->bits, mask->length);
+  return newmask;
+}
+
+/* Combine two bit masks.  */
+
+void
+cgen_bitset_union (CGEN_BITSET * mask1, CGEN_BITSET * mask2,
+		   CGEN_BITSET * result)
+{
+  unsigned i;
+
+  if (! mask1 || ! mask2 || ! result
+      || mask1->length != mask2->length
+      || mask1->length != result->length)
+    return;
+
+  for (i = 0; i < result->length; ++i)
+    result->bits[i] = mask1->bits[i] | mask2->bits[i];
+}