re PR target/24600 (unrecognizable instruction)

ChangeLog:

	PR target/24600
	* loop.c (loop_givs_rescan): Use force_operand to expand
	complex GIVs.

testsuite/ChangeLog:

	PR target/24600
	* gcc.dg/pr24600.c: New test.

From-SVN: r106404

gcc/ChangeLog

+2005-11-02  Ulrich Weigand  <uweigand@de.ibm.com>
+
+	PR target/24600
+	* loop.c (loop_givs_rescan): Use force_operand to expand
+	complex GIVs.
+
 2005-11-02  Andrew Pinski  <pinskia@physics.uc.edu>
 
 	PR 22429

gcc/loop.c

@@ -5497,9 +5497,16 @@ loop_givs_rescan (struct loop *loop, struct iv_class *bl, rtx *reg_map)
 	  /* Not replaceable; emit an insn to set the original
 	     giv reg from the reduced giv.  */
 	  else if (REG_P (*v->location))
-	    loop_insn_emit_before (loop, 0, v->insn,
-				   gen_move_insn (*v->location,
-						  v->new_reg));
+	    {
+	      rtx tem;
+	      start_sequence ();
+	      tem = force_operand (v->new_reg, *v->location);
+	      if (tem != *v->location)
+		emit_move_insn (*v->location, tem);
+	      tem = get_insns ();
+	      end_sequence ();
+	      loop_insn_emit_before (loop, 0, v->insn, tem);
+	    }
 	  else if (GET_CODE (*v->location) == PLUS
 		   && REG_P (XEXP (*v->location, 0))
 		   && CONSTANT_P (XEXP (*v->location, 1)))

gcc/testsuite/ChangeLog

+2005-11-02  Ulrich Weigand  <uweigand@de.ibm.com>
+
+	PR target/24600
+	* gcc.dg/pr24600.c: New test.
+
 2005-11-02  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/19253

gcc/testsuite/gcc.dg/pr24600.c

+/* This used to ICE on s390 due to a old-loop bug.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+char *strcpy (char *dest, const char *src);
+
+void test (char *Line, int len)
+{
+  int z;
+
+  for (z = 1; z <= len; z++)
+    if (Line[z - 1])
+      strcpy (Line + z + 1, Line);
+}
+