poly_int: set_inc_state

This trivial patch makes auto-inc-dec.c:set_inc_state take a poly_int64.

2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* auto-inc-dec.c (set_inc_state): Take the mode size as a poly_int64
	rather than an int.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r256153

gcc/ChangeLog

@@ -2,6 +2,13 @@
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
 
+	* auto-inc-dec.c (set_inc_state): Take the mode size as a poly_int64
+	rather than an int.
+
+2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>
+	    Alan Hayward  <alan.hayward@arm.com>
+	    David Sherwood  <david.sherwood@arm.com>
+
 	* expr.c (expand_expr_real_1): Use tree_to_poly_uint64
 	instead of int_size_in_bytes when handling VIEW_CONVERT_EXPRs
 	via stack temporaries.  Treat the mode size as polynomial too.

gcc/auto-inc-dec.c

@@ -152,14 +152,14 @@ enum gen_form
 static rtx mem_tmp;
 
 static enum inc_state
-set_inc_state (HOST_WIDE_INT val, int size)
+set_inc_state (HOST_WIDE_INT val, poly_int64 size)
 {
   if (val == 0)
     return INC_ZERO;
   if (val < 0)
-    return (val == -size) ? INC_NEG_SIZE : INC_NEG_ANY;
+    return known_eq (val, -size) ? INC_NEG_SIZE : INC_NEG_ANY;
   else
-    return (val == size) ? INC_POS_SIZE : INC_POS_ANY;
+    return known_eq (val, size) ? INC_POS_SIZE : INC_POS_ANY;
 }
 
 /* The DECISION_TABLE that describes what form, if any, the increment