--- rxvt-unicode/src/rxvtutil.h	2007/12/02 22:37:14	1.34
+++ rxvt-unicode/src/rxvtutil.h	2008/11/05 14:43:54	1.38
@@ -15,10 +15,18 @@
 
 #if __GNUC__ >= 4
 # define rxvt_attribute(x) __attribute__(x)
+# define expect(expr,value)         __builtin_expect ((expr),(value))
 #else
 # define rxvt_attribute(x)
+# define expect(expr,value)         (expr)
 #endif
 
+// put into ifs if you are very sure that the expression
+// is mostly true or mosty false. note that these return
+// booleans, not the expression.
+#define expect_false(expr) expect ((expr) != 0, 0)
+#define expect_true(expr)  expect ((expr) != 0, 1)
+
 #define NORETURN rxvt_attribute ((noreturn))
 #define UNUSED   rxvt_attribute ((unused))
 #define CONST    rxvt_attribute ((const))
@@ -101,8 +109,12 @@
 #define IN_RANGE_EXC(val,beg,end) \
   ((unsigned int)(val) - (unsigned int)(beg) <  (unsigned int)(end) - (unsigned int)(beg))
 
+// for m >= -n, ensure remainder lies between 0..n-1
+#define MOD(m,n) (((m) + (n)) % (n))
+
 // makes dynamically allocated objects zero-initialised
-struct zero_initialized {
+struct zero_initialized
+{
   void *operator new (size_t s);
   void operator delete (void *p, size_t s);
 };
@@ -113,7 +125,8 @@
  *  Copyright (C) 1997-98 Kay Roemer & Arno Puder
  */
 template<class T>
-struct simplevec {
+struct simplevec
+{
     typedef T* iterator;
     typedef const T* const_iterator;
     typedef unsigned long size_type;
@@ -364,7 +377,8 @@
 
 template<typename T>
 struct vector : simplevec<T>
-{ };
+{
+};
 
 struct stringvec : simplevec<char *>
 {
@@ -377,7 +391,8 @@
 
 #if 0
 template<typename T>
-struct rxvt_vec : simplevec<void *> {
+struct rxvt_vec : simplevec<void *>
+{
   typedef T *iterator;
 
   void push_back (T d) { simplevec<void *>::push_back ((void *)d); }
@@ -392,7 +407,8 @@
 #endif
 
 template<typename T>
-struct auto_ptr {
+struct auto_ptr
+{
   T *p;
 
   auto_ptr () : p (0) { }