Allow libcalls to be installed for legacy __sync optabs.

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

diff --git a/gcc/regmove.c b/gcc/regmove.c
index d3c733e..a2baca1 100644 (file)
--- a/gcc/regmove.c
+++ b/gcc/regmove.c
@@ -514,7 +514,7 @@ optimize_reg_copy_3 (rtx insn, rtx dest, rtx src)
   rtx src_reg = XEXP (src, 0);
   int src_no = REGNO (src_reg);
   int dst_no = REGNO (dest);
-  rtx p, set;
+  rtx p, set, set_insn;
   enum machine_mode old_mode;
   basic_block bb = BLOCK_FOR_INSN (insn);
 
@@ -548,10 +548,10 @@ optimize_reg_copy_3 (rtx insn, rtx dest, rtx src)
   /* Do not use a SUBREG to truncate from one mode to another if truncation
      is not a nop.  */
   if (GET_MODE_BITSIZE (GET_MODE (src_reg)) <= GET_MODE_BITSIZE (GET_MODE (src))
-      && !TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (GET_MODE (src)),
-                                GET_MODE_BITSIZE (GET_MODE (src_reg))))
+      && !TRULY_NOOP_TRUNCATION_MODES_P (GET_MODE (src), GET_MODE (src_reg)))
     return;
 
+  set_insn = p;
   old_mode = GET_MODE (src_reg);
   PUT_MODE (src_reg, GET_MODE (src));
   XEXP (src, 0) = SET_SRC (set);
@@ -584,9 +584,19 @@ optimize_reg_copy_3 (rtx insn, rtx dest, rtx src)
     }
   else
     {
-      rtx note = find_reg_note (p, REG_EQUAL, NULL_RTX);
+      rtx note = find_reg_note (set_insn, REG_EQUAL, NULL_RTX);
       if (note)
-       remove_note (p, note);
+       {
+         if (rtx_equal_p (XEXP (note, 0), XEXP (src, 0)))
+           {
+             XEXP (note, 0)
+               = gen_rtx_fmt_e (GET_CODE (src), GET_MODE (src),
+                                XEXP (note, 0));
+             df_notes_rescan (set_insn);
+           }
+         else
+           remove_note (set_insn, note);
+       }
     }
 }
 
@@ -1225,12 +1235,12 @@ regmove_optimize (void)
   df_note_add_problem ();
   df_analyze ();
 
-  if (flag_ira_loop_pressure)
-    ira_set_pseudo_classes (dump_file);
-
   regstat_init_n_sets_and_refs ();
   regstat_compute_ri ();
 
+  if (flag_ira_loop_pressure)
+    ira_set_pseudo_classes (dump_file);
+
   regno_src_regno = XNEWVEC (int, nregs);
   for (i = nregs; --i >= 0; )
     regno_src_regno[i] = -1;
@@ -1371,7 +1381,6 @@ struct rtl_opt_pass pass_regmove =
   0,                                    /* properties_destroyed */
   0,                                    /* todo_flags_start */
   TODO_df_finish | TODO_verify_rtl_sharing |
-  TODO_dump_func |
   TODO_ggc_collect                      /* todo_flags_finish */
  }
 };