PR c++/48873

[pf3gnuchains/gcc-fork.git] / gcc / genattr.c

diff --git a/gcc/genattr.c b/gcc/genattr.c
index e4609ca..acb3a38 100644 (file)
--- a/gcc/genattr.c
+++ b/gcc/genattr.c
@@ -1,6 +1,6 @@
 /* Generate attribute information (insn-attr.h) from machine description.
-   Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008
-   Free Software Foundation, Inc.
+   Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008,
+   2010  Free Software Foundation, Inc.
    Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
 
 This file is part of GCC.
@@ -40,12 +40,18 @@ write_upcase (const char *str)
     putchar (TOUPPER(*str));
 }
 
+static VEC (rtx, heap) *const_attrs, *reservations;
+
+
 static void
 gen_attr (rtx attr)
 {
   const char *p, *tag;
   int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
 
+  if (is_const)
+    VEC_safe_push (rtx, heap, const_attrs, attr);
+
   printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
 
   /* If numeric attribute, don't need to write an enum.  */
@@ -92,6 +98,68 @@ extern int insn_current_length (rtx);\n\n\
     }
 }
 
+/* Check that attribute NAME is used in define_insn_reservation condition
+   EXP.  Return true if it is.  */
+static bool
+check_tune_attr (const char *name, rtx exp)
+{
+  switch (GET_CODE (exp))
+    {
+    case AND:
+      if (check_tune_attr (name, XEXP (exp, 0)))
+       return true;
+      return check_tune_attr (name, XEXP (exp, 1));
+
+    case IOR:
+      return (check_tune_attr (name, XEXP (exp, 0))
+             && check_tune_attr (name, XEXP (exp, 1)));
+
+    case EQ_ATTR:
+      return strcmp (XSTR (exp, 0), name) == 0;
+
+    default:
+      return false;
+    }
+}
+
+/* Try to find a const attribute (usually cpu or tune) that is used
+   in all define_insn_reservation conditions.  */
+static bool
+find_tune_attr (rtx exp)
+{
+  unsigned int i;
+  rtx attr;
+
+  switch (GET_CODE (exp))
+    {
+    case AND:
+    case IOR:
+      if (find_tune_attr (XEXP (exp, 0)))
+       return true;
+      return find_tune_attr (XEXP (exp, 1));
+
+    case EQ_ATTR:
+      if (strcmp (XSTR (exp, 0), "alternative") == 0)
+       return false;
+
+      FOR_EACH_VEC_ELT (rtx, const_attrs, i, attr)
+       if (strcmp (XSTR (attr, 0), XSTR (exp, 0)) == 0)
+         {
+           unsigned int j;
+           rtx resv;
+
+           FOR_EACH_VEC_ELT (rtx, reservations, j, resv)
+             if (! check_tune_attr (XSTR (attr, 0), XEXP (resv, 2)))
+               return false;
+           return true;
+         }
+      return false;
+
+    default:
+      return false;
+    }
+}
+
 int
 main (int argc, char **argv)
 {
@@ -162,11 +230,16 @@ main (int argc, char **argv)
         }
 
       else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
-       num_insn_reservations++;
+       {
+         num_insn_reservations++;
+         VEC_safe_push (rtx, heap, reservations, desc);
+       }
     }
 
   if (num_insn_reservations > 0)
     {
+      bool has_tune_attr
+       = find_tune_attr (XEXP (VEC_index (rtx, reservations, 0), 2));
       /* Output interface for pipeline hazards recognition based on
         DFA (deterministic finite state automata.  */
       printf ("\n#define INSN_SCHEDULING\n");
@@ -181,10 +254,24 @@ main (int argc, char **argv)
       printf ("#define CPU_UNITS_QUERY 0\n");
       printf ("#endif\n\n");
       /* Interface itself: */
-      printf ("/* Internal insn code number used by automata.  */\n");
-      printf ("extern int internal_dfa_insn_code (rtx);\n\n");
-      printf ("/* Insn latency time defined in define_insn_reservation. */\n");
-      printf ("extern int insn_default_latency (rtx);\n\n");
+      if (has_tune_attr)
+       {
+         printf ("/* Initialize fn pointers for internal_dfa_insn_code\n");
+         printf ("   and insn_default_latency.  */\n");
+         printf ("extern void init_sched_attrs (void);\n\n");
+         printf ("/* Internal insn code number used by automata.  */\n");
+         printf ("extern int (*internal_dfa_insn_code) (rtx);\n\n");
+         printf ("/* Insn latency time defined in define_insn_reservation. */\n");
+         printf ("extern int (*insn_default_latency) (rtx);\n\n");
+       }
+      else
+       {
+         printf ("#define init_sched_attrs() do { } while (0)\n\n");
+         printf ("/* Internal insn code number used by automata.  */\n");
+         printf ("extern int internal_dfa_insn_code (rtx);\n\n");
+         printf ("/* Insn latency time defined in define_insn_reservation. */\n");
+         printf ("extern int insn_default_latency (rtx);\n\n");
+       }
       printf ("/* Return nonzero if there is a bypass for given insn\n");
       printf ("   which is a data producer.  */\n");
       printf ("extern int bypass_p (rtx);\n\n");