re PR inline-asm/6162 (i386 asm reloader ice in reload_cse_simplify_operands)

	PR inline-asm/6162
	* reload.c (find_reloads): Only support one pair of commutative
	operands.

From-SVN: r76886

gcc/ChangeLog

+2004-01-28  Ian Lance Taylor  <ian@wasabisystems.com>
+
+	PR inline-asm/6162
+	* reload.c (find_reloads): Only support one pair of commutative
+	operands.
+
 2004-01-29  Roger Sayle  <roger@eyesopen.com>
 
 	PR java/13824

gcc/reload.c

@@ -2605,7 +2605,17 @@ find_reloads (rtx insn, int replace, int ind_levels, int live_known,
 	      if (i == noperands - 1)
 		abort ();
 
-	      commutative = i;
+	      /* We currently only support one commutative pair of
+		 operands.  Some existing asm code currently uses more
+		 than one pair.  Previously, that would usually work,
+		 but sometimes it would crash the compiler.  We
+		 continue supporting that case as well as we can by
+		 silently ignoring all but the first pair.  In the
+		 future we may handle it correctly.  */
+	      if (commutative < 0)
+		commutative = i;
+	      else if (!this_insn_is_asm)
+		abort ();
 	    }
 	  else if (ISDIGIT (c))
 	    {
@@ -2979,9 +2989,8 @@ find_reloads (rtx insn, int replace, int ind_levels, int live_known,
 		break;
 
 	      case '%':
-		/* The last operand should not be marked commutative.  */
-		if (i != noperands - 1)
-		  commutative = i;
+		/* We only support one commutative marker, the first
+		   one.  We already set commutative above.  */
 		break;
 
 	      case '?':