re PR target/79729 (ICE in ix86_print_operand, at config/i386/i386.c:18231)

	PR target/79729
	* config/i386/i386.c (ix86_print_operand) <case 'R'>: Replace
	gcc_unreachable with output_operand_lossage.

	* gcc.target/i386/pr79729.c: New test.

From-SVN: r245781

gcc/ChangeLog

+2017-02-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/79729
+	* config/i386/i386.c (ix86_print_operand) <case 'R'>: Replace
+	gcc_unreachable with output_operand_lossage.
+
 2017-02-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/79740

gcc/config/i386/i386.c

@@ -18234,7 +18234,8 @@ ix86_print_operand (FILE *file, rtx x, int code)
 	      fputs ("{rz-sae}", file);
 	      break;
 	    default:
-	      gcc_unreachable ();
+	      output_operand_lossage ("operand is not a specific integer, "
+				      "invalid operand code 'R'");
 	    }
 
 	  if (ASSEMBLER_DIALECT == ASM_ATT)

gcc/testsuite/ChangeLog

+2017-02-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/79729
+	* gcc.target/i386/pr79729.c: New test.
+
 2017-02-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/79740

gcc/testsuite/gcc.target/i386/pr79729.c

+/* PR target/79729 */
+/* { dg-do compile } */
+
+void
+foo (int x)
+{
+  __asm__ volatile ("# %R0" : : "n" (129));	/* { dg-error "invalid operand code" } */
+}