tree-ssa-loop-ivcanon.c (constant_after_peeling): Do not require sth as strict…

tree-ssa-loop-ivcanon.c (constant_after_peeling): Do not require sth as strict as a simple_iv but a chrec without symbols and an...

2016-04-21  Richard Biener  <rguenther@suse.de>

	* tree-ssa-loop-ivcanon.c (constant_after_peeling): Do not require
	sth as strict as a simple_iv but a chrec without symbols and an
	operand defined in the loop we are peeling (and not some subloop).
	(propagate_constants_for_unrolling): Propagate all constants.

	* gcc.dg/vect/no-scevccp-outer-13.c: Adjust to prevent unrolling
	of inner loops.
	* gcc.dg/vect/no-scevccp-outer-7.c: Likewise.
	* gcc.dg/vect/vect-104.c: Likewise.

From-SVN: r247048

gcc/ChangeLog

+2016-04-21  Richard Biener  <rguenther@suse.de>
+
+	* tree-ssa-loop-ivcanon.c (constant_after_peeling): Do not require
+	sth as strict as a simple_iv but a chrec without symbols and an
+	operand defined in the loop we are peeling (and not some subloop).
+	(propagate_constants_for_unrolling): Propagate all constants.
+
 2017-04-20  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/79804

gcc/testsuite/ChangeLog

+2016-04-21  Richard Biener  <rguenther@suse.de>
+
+	* gcc.dg/vect/no-scevccp-outer-13.c: Adjust to prevent unrolling
+	of inner loops.
+	* gcc.dg/vect/no-scevccp-outer-7.c: Likewise.
+	* gcc.dg/vect/vect-104.c: Likewise.
+
 2017-04-21  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR tree-optimization/80426

gcc/testsuite/gcc.dg/vect/no-scevccp-outer-13.c

 /* { dg-require-effective-target vect_int } */
+/* { dg-additional-options "--param max-completely-peel-times=1" } */
 
 #include <stdarg.h>
 #include "tree-vect.h"

gcc/testsuite/gcc.dg/vect/no-scevccp-outer-7.c

 /* { dg-require-effective-target vect_int } */
+/* { dg-additional-options "--param max-completely-peel-times=1" } */
 
 #include <stdarg.h>
 #include "tree-vect.h"

gcc/testsuite/gcc.dg/vect/vect-104.c

 /* { dg-require-effective-target vect_int } */
+/* { dg-additional-options "--param max-completely-peel-times=1" } */
 
 #include <stdlib.h>
 #include <stdarg.h>

gcc/tree-ssa-loop-ivcanon.c

@@ -157,8 +157,6 @@ struct loop_size
 static bool
 constant_after_peeling (tree op, gimple *stmt, struct loop *loop)
 {
-  affine_iv iv;
-
   if (is_gimple_min_invariant (op))
     return true;
 
@@ -188,12 +186,12 @@ constant_after_peeling (tree op, gimple *stmt, struct loop *loop)
       return false;
     }
 
-  /* Induction variables are constants.  */
-  if (!simple_iv (loop, loop_containing_stmt (stmt), op, &iv, false))
-    return false;
-  if (!is_gimple_min_invariant (iv.base))
+  /* Induction variables are constants when defined in loop.  */
+  if (loop_containing_stmt (stmt) != loop)
     return false;
-  if (!is_gimple_min_invariant (iv.step))
+  tree ev = analyze_scalar_evolution (loop, op);
+  if (chrec_contains_undetermined (ev)
+      || chrec_contains_symbols (ev))
     return false;
   return true;
 }
@@ -1259,7 +1257,7 @@ propagate_constants_for_unrolling (basic_block bb)
 
       if (! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (result)
 	  && gimple_phi_num_args (phi) == 1
-	  && TREE_CODE (arg) == INTEGER_CST)
+	  && CONSTANT_CLASS_P (arg))
 	{
 	  replace_uses_by (result, arg);
 	  gsi_remove (&gsi, true);
@@ -1276,7 +1274,7 @@ propagate_constants_for_unrolling (basic_block bb)
       tree lhs;
 
       if (is_gimple_assign (stmt)
-	  && gimple_assign_rhs_code (stmt) == INTEGER_CST
+	  && TREE_CODE_CLASS (gimple_assign_rhs_code (stmt)) == tcc_constant
 	  && (lhs = gimple_assign_lhs (stmt), TREE_CODE (lhs) == SSA_NAME)
 	  && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs))
 	{