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-rw-r--r--assert/assert.h23
1 files changed, 20 insertions, 3 deletions
diff --git a/assert/assert.h b/assert/assert.h
index 89e28b5453..9908d4176a 100644
--- a/assert/assert.h
+++ b/assert/assert.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,1992,1994-1999,2000,2001 Free Software Foundation, Inc.
+/* Copyright (C) 1991,1992,1994-2001,2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -84,16 +84,33 @@ extern void __assert (const char *__assertion, const char *__file, int __line)
 
 __END_DECLS
 
-# define assert(expr) \
+/* For the macro definition we use gcc's __builtin_expect if possible
+   to generate good code for the non-error case.  gcc 3.0 is a good
+   enough estimate for when the feature became available.  */
+# if __GNUC_PREREQ (3, 0)
+#  define assert(expr) \
+  (__ASSERT_VOID_CAST (__builtin_expect (expr, 1) ? 0 :			      \
+		       (__assert_fail (__STRING(expr), __FILE__, __LINE__,    \
+				       __ASSERT_FUNCTION), 0)))
+# else
+#  define assert(expr) \
   (__ASSERT_VOID_CAST ((expr) ? 0 :					      \
 		       (__assert_fail (__STRING(expr), __FILE__, __LINE__,    \
 				       __ASSERT_FUNCTION), 0)))
+# endif
 
 # ifdef	__USE_GNU
-#  define assert_perror(errnum) \
+#  if __GNUC_PREREQ (3, 0)
+#   define assert_perror(errnum) \
   (__ASSERT_VOID_CAST (!(errnum) ? 0 :					      \
 		       (__assert_perror_fail ((errnum), __FILE__, __LINE__,   \
 					      __ASSERT_FUNCTION), 0)))
+#  else
+#   define assert_perror(errnum) \
+  (__ASSERT_VOID_CAST (__builtin_expect (!(errnum), 1) ? 0 :		      \
+		       (__assert_perror_fail ((errnum), __FILE__, __LINE__,   \
+					      __ASSERT_FUNCTION), 0)))
+#  endif
 # endif
 
 /* Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'