optabs.c (prepare_float_lib_cmp): Always attach a REG_EQUAL note to the comparison...

	* optabs.c (prepare_float_lib_cmp): Always attach a REG_EQUAL note
	to the comparison, as emit_libcall_block calls copy_rtx on equiv.

From-SVN: r72262

gcc/ChangeLog

+2003-10-09  Roger Sayle  <roger@eyesopen.com>
+
+	* optabs.c (prepare_float_lib_cmp): Always attach a REG_EQUAL note
+	to the comparison, as emit_libcall_block calls copy_rtx on equiv.
+
 2003-10-09  Dorit Naishlos  <dorit@il.ibm.com>
 
 	* haifa-sched.c (ok_for_early_schedule): New function.

gcc/optabs.c

@@ -3871,70 +3871,62 @@ prepare_float_lib_cmp (rtx *px, rtx *py, enum rtx_code *pcomparison,
       y = convert_to_mode (mode, y, 0);
     }
 
-  /* If we're optimizing attach a REG_EQUAL note describing the semantics
-     of the libcall to the RTL.  The allows the RTL optimizers to delete
-     the libcall if the condition can be determined at compile-time.  */
-  if (optimize
-      && ! side_effects_p (x)
-      && ! side_effects_p (y))
+  /* Attach a REG_EQUAL note describing the semantics of the libcall to
+     the RTL.  The allows the RTL optimizers to delete the libcall if the
+     condition can be determined at compile-time.  */
+  if (comparison == UNORDERED)
     {
-      if (comparison == UNORDERED)
-	{
-	  rtx temp = simplify_gen_relational (NE, word_mode, mode, x, x);
-	  equiv = simplify_gen_relational (NE, word_mode, mode, y, y);
-	  equiv = simplify_gen_ternary (IF_THEN_ELSE, word_mode, word_mode,
-					temp, const_true_rtx, equiv);
-	}
-      else
+      rtx temp = simplify_gen_relational (NE, word_mode, mode, x, x);
+      equiv = simplify_gen_relational (NE, word_mode, mode, y, y);
+      equiv = simplify_gen_ternary (IF_THEN_ELSE, word_mode, word_mode,
+				    temp, const_true_rtx, equiv);
+    }
+  else
+    {
+      equiv = simplify_gen_relational (comparison, word_mode, mode, x, y);
+      if (! FLOAT_LIB_COMPARE_RETURNS_BOOL (mode, comparison))
 	{
-	  equiv = simplify_gen_relational (comparison, word_mode, mode, x, y);
-	  if (! FLOAT_LIB_COMPARE_RETURNS_BOOL (mode, comparison))
-	    {
-	      rtx true_rtx, false_rtx;
-
-	      switch (comparison)
-		{
-		case EQ:
-		  true_rtx = const0_rtx;
-		  false_rtx = const_true_rtx;
-		  break;
+	  rtx true_rtx, false_rtx;
 
-		case NE:
-		  true_rtx = const_true_rtx;
-		  false_rtx = const0_rtx;
-		  break;
-
-		case GT:
-		  true_rtx = const1_rtx;
-		  false_rtx = const0_rtx;
-		  break;
-
-		case GE:
-		  true_rtx = const0_rtx;
-		  false_rtx = constm1_rtx;
-		  break;
-
-		case LT:
-		  true_rtx = constm1_rtx;
-		  false_rtx = const0_rtx;
-		  break;
-
-		case LE:
-		  true_rtx = const0_rtx;
-		  false_rtx = const1_rtx;
-		  break;
-
-		default:
-		  abort ();
-		}
-	      equiv = simplify_gen_ternary (IF_THEN_ELSE, word_mode,
-					    word_mode, equiv,
-					    true_rtx, false_rtx);
+	  switch (comparison)
+	    {
+	    case EQ:
+	      true_rtx = const0_rtx;
+	      false_rtx = const_true_rtx;
+	      break;
+
+	    case NE:
+	      true_rtx = const_true_rtx;
+	      false_rtx = const0_rtx;
+	      break;
+
+	    case GT:
+	      true_rtx = const1_rtx;
+	      false_rtx = const0_rtx;
+	      break;
+
+	    case GE:
+	      true_rtx = const0_rtx;
+	      false_rtx = constm1_rtx;
+	      break;
+
+	    case LT:
+	      true_rtx = constm1_rtx;
+	      false_rtx = const0_rtx;
+	      break;
+
+	    case LE:
+	      true_rtx = const0_rtx;
+	      false_rtx = const1_rtx;
+	      break;
+
+	    default:
+	      abort ();
 	    }
+	  equiv = simplify_gen_ternary (IF_THEN_ELSE, word_mode, word_mode,
+					equiv, true_rtx, false_rtx);
 	}
     }
-  else
-    equiv = NULL_RTX;
 
   start_sequence ();
   value = emit_library_call_value (libfunc, NULL_RTX, LCT_CONST,