re PR rtl-optimization/33669 (Revision 128957 miscompiles 481.wrf)

2007-10-07  Kenneth Zadeck <zadeck@naturalbridge.com>

	PR middle-end/33669
	* ra-conflict.c (record_one_conflict_between_regnos, 
	set_conflicts_for_earlyclobber, global_conflicts): Improved logging.
	(global_conflicts): Enhanced incorrect check.

From-SVN: r129193

gcc/ChangeLog

+2007-10-07  Kenneth Zadeck <zadeck@naturalbridge.com>
+
+	PR middle-end/33669
+	* ra-conflict.c (record_one_conflict_between_regnos, 
+	set_conflicts_for_earlyclobber, global_conflicts): Improved logging.
+	(global_conflicts): Enhanced incorrect check.
+	
 2007-10-09  Geoffrey Keating  <geoffk@apple.com>
 
 	* dwarf2out.c (output_call_frame_info): FDEs are always emitted

gcc/ra-conflict.c

@@ -401,9 +401,6 @@ set_conflicts_for_earlyclobber (rtx insn)
 						    recog_data.operand[use + 1]);
 		}
 	}
-
-  if (dump_file) 
-    fprintf (dump_file, "  finished early clobber conflicts.\n");
 }
 
 
@@ -983,12 +980,12 @@ global_conflicts (void)
 			set_renumbers_live (&renumbers_live, live_subregs, live_subregs_used, 
 					    allocnum, renumber);
 		    }
-		  
-		  else if (!sparseset_bit_p (allocnos_live, allocnum))
+		  else if (live_subregs_used[allocnum] > 0
+			   || !sparseset_bit_p (allocnos_live, allocnum))
 		    {
 		      if (dump_file)
-			fprintf (dump_file, "    dying pseudo\n");
-		      
+			fprintf (dump_file, "    %sdying pseudo\n", 
+				 (live_subregs_used[allocnum] > 0) ? "partially ": "");
 		      /* Resetting the live_subregs_used is
 			 effectively saying do not use the subregs
 			 because we are reading the whole pseudo.  */
@@ -1071,6 +1068,8 @@ global_conflicts (void)
 		 FIXME: We should consider either adding a new kind of
 		 clobber, or adding a flag to the clobber distinguish
 		 these two cases.  */
+	      if (dump_file && VEC_length (df_ref_t, clobbers))
+		fprintf (dump_file, "  clobber conflicts\n");
 	      for (k = VEC_length (df_ref_t, clobbers) - 1; k >= 0; k--)
 		{
 		  struct df_ref *def = VEC_index (df_ref_t, clobbers, k);
@@ -1132,6 +1131,8 @@ global_conflicts (void)
 	      if (GET_CODE (PATTERN (insn)) == PARALLEL && multiple_sets (insn))
 		{ 
 		  int j;
+		  if (dump_file)
+		    fprintf (dump_file, "  multiple sets\n");
 		  for (j = VEC_length (df_ref_t, dying_regs) - 1; j >= 0; j--)
 		    {
 		      int used_in_output = 0;