diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0b812c18a53f..0a4c2dcc4cef 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2002-12-09  Richard Henderson  <rth@redhat.com>
+
+	* config/i386/i386.h (TARGET_CPU_CPP_BUILTINS): Define
+	__tune_pentium2__ and __tune_pentium3__ as necessary.
+
 2002-12-09  Richard Henderson  <rth@redhat.com>
 
 	* target.h (gcc_target): Add cannot_force_const_mem.
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 287cec3e5039..493a2b5bf9cb 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -515,6 +515,15 @@ extern int x86_prefetch_sse;
 	{							\
 	  builtin_define ("__tune_i686__");			\
 	  builtin_define ("__tune_pentiumpro__");		\
+	  switch (last_cpu_char)				\
+	    {							\
+	    case '3':						\
+	      builtin_define ("__tune_pentium3__");		\
+	      /* FALLTHRU */					\
+	    case '2':						\
+	      builtin_define ("__tune_pentium2__");		\
+	      break;						\
+	    }							\
 	}							\
       else if (TARGET_K6)					\
 	{							\