X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/36c67859bdb3aae4d5b837290939548bd24ad842..0f32e0f83177bd620a1deee0e0641f8323742b6c:/mpx.c

diff --git a/mpx.c b/mpx.c
index 13b6fa0..f89a89b 100644
--- a/mpx.c
+++ b/mpx.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: mpx.c,v 1.10 2000/10/08 12:06:12 mdw Exp $
+ * $Id: mpx.c,v 1.11 2001/04/03 19:36:05 mdw Exp $
  *
  * Low-level multiprecision arithmetic
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: mpx.c,v $
+ * Revision 1.11  2001/04/03 19:36:05  mdw
+ * Add some simple bitwise operations so that Perl can use them.
+ *
  * Revision 1.10  2000/10/08 12:06:12  mdw
  * Provide @mpx_ueq@ for rapidly testing equality of two integers.
  *
@@ -400,6 +403,50 @@ void mpx_lsr(mpw *dv, mpw *dvl, const mpw *av, const mpw *avl, size_t n)
 done:;
 }
 
+/*----- Bitwise operations ------------------------------------------------*/
+
+/* --- @mpx_and@, @mpx_or@, @mpx_xor@, @mpx_not@ --- *
+ *
+ * Arguments:	@mpw *dv, *dvl@ = destination vector
+ *		@const mpw *av, *avl@ = first source vector
+ *		@const mpw *bv, *bvl@ = second source vector
+ *
+ * Returns:	---
+ *
+ * Use;		Does the obvious bitwise operations.
+ */
+
+#define MPX_BITBINOP(name, op)						\
+									\
+void mpx_##name(mpw *dv, mpw *dvl, const mpw *av, const mpw *avl,	\
+		const mpw *bv, const mpw *bvl)				\
+{									\
+  MPX_SHRINK(av, avl);							\
+  MPX_SHRINK(bv, bvl);							\
+									\
+  while (dv < dvl) {							\
+    mpw a, b;								\
+    a = (av < avl) ? *av++ : 0;						\
+    b = (bv < bvl) ? *bv++ : 0;						\
+    *dv++ = a op b;							\
+  }									\
+}
+
+MPX_BITBINOP(and, &)
+MPX_BITBINOP(or, |)
+MPX_BITBINOP(xor, ^)
+
+void mpx_not(mpw *dv, mpw *dvl, const mpw *av, const mpw *avl)
+{
+  MPX_SHRINK(av, avl);
+
+  while (dv < dvl) {
+    mpw a;
+    a = (av < avl) ? *av++ : 0;
+    *dv++ = ~a;
+  }
+}
+
 /*----- Unsigned arithmetic -----------------------------------------------*/
 
 /* --- @mpx_2c@ --- *