re PR target/79804 (ICE in print_reg, at config/i386/i386.c:17637)

	PR target/79804
	* config/i386/i386.c (print_reg): Remove assert for disalowed
	regno values, call output_operand_lossage instead.

testsuite/ChangeLog:

	PR target/79804
	* gcc.target/i386/pr79804.c: New test.

From-SVN: r247037

gcc/ChangeLog

 2017-04-20  Uros Bizjak  <ubizjak@gmail.com>
 
+	PR target/79804
+	* config/i386/i386.c (print_reg): Remove assert for disalowed
+	regno values, call output_operand_lossage instead.
+
+2017-04-20  Uros Bizjak  <ubizjak@gmail.com>
+
 	PR target/78090
 	* config/i386/constraints.md (Yc): New register constraint.
 	* config/i386/i386.md (*float<SWI48:mode><MODEF:mode>2_mixed):

gcc/config/i386/i386.c

@@ -17650,12 +17650,16 @@ print_reg (rtx x, int code, FILE *file)
 
   regno = REGNO (x);
 
-  gcc_assert (regno != ARG_POINTER_REGNUM
-	      && regno != FRAME_POINTER_REGNUM
-	      && regno != FPSR_REG
-	      && regno != FPCR_REG);
-
-  if (regno == FLAGS_REG)
+  if (regno == ARG_POINTER_REGNUM
+      || regno == FRAME_POINTER_REGNUM
+      || regno == FPSR_REG
+      || regno == FPCR_REG)
+    {
+      output_operand_lossage
+	("invalid use of register '%s'", reg_names[regno]);
+      return;
+    }
+  else if (regno == FLAGS_REG)
     {
       output_operand_lossage ("invalid use of asm flag output");
       return;

gcc/testsuite/ChangeLog

 2017-04-20  Uros Bizjak  <ubizjak@gmail.com>
 
+	PR target/79804
+	* gcc.target/i386/pr79804.c: New test.
+
+2017-04-20  Uros Bizjak  <ubizjak@gmail.com>
+
 	PR target/78090
 	* gcc.target/i386/conversion-2.c: Remove obsolete test.
 

gcc/testsuite/gcc.target/i386/pr79804.c

+/* PR target/79804 */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+void foo (void)
+{
+  register int r20 asm ("20");
+
+  asm volatile ("# %0" : "=r"(r20));  /* { dg-error "invalid use of register" } */
+}