===================================================================
@@ -155,7 +155,7 @@ along with GCC; see the file COPYING3.
static void vect_estimate_min_profitable_iters (loop_vec_info, int *, int *);
static stmt_vec_info vect_is_simple_reduction (loop_vec_info, stmt_vec_info,
- bool *);
+ bool *, bool *);
/* Subroutine of vect_determine_vf_for_stmt that handles only one
statement. VECTYPE_MAYBE_SET_P is true if STMT_VINFO_VECTYPE
@@ -489,7 +489,7 @@ vect_analyze_scalar_cycles_1 (loop_vec_i
tree init, step;
auto_vec<stmt_vec_info, 64> worklist;
gphi_iterator gsi;
- bool double_reduc;
+ bool double_reduc, reduc_chain;
DUMP_VECT_SCOPE ("vect_analyze_scalar_cycles");
@@ -561,7 +561,8 @@ vect_analyze_scalar_cycles_1 (loop_vec_i
&& STMT_VINFO_DEF_TYPE (stmt_vinfo) == vect_unknown_def_type);
stmt_vec_info reduc_stmt_info
- = vect_is_simple_reduction (loop_vinfo, stmt_vinfo, &double_reduc);
+ = vect_is_simple_reduction (loop_vinfo, stmt_vinfo, &double_reduc,
+ &reduc_chain);
if (reduc_stmt_info)
{
STMT_VINFO_REDUC_DEF (stmt_vinfo) = reduc_stmt_info;
@@ -596,7 +597,7 @@ vect_analyze_scalar_cycles_1 (loop_vec_i
/* Store the reduction cycles for possible vectorization in
loop-aware SLP if it was not detected as reduction
chain. */
- if (! REDUC_GROUP_FIRST_ELEMENT (reduc_stmt_info))
+ if (! reduc_chain)
LOOP_VINFO_REDUCTIONS (loop_vinfo).safe_push
(reduc_stmt_info);
}
@@ -2854,7 +2866,7 @@ check_reduction_path (dump_user_location
static stmt_vec_info
vect_is_simple_reduction (loop_vec_info loop_info, stmt_vec_info phi_info,
- bool *double_reduc)
+ bool *double_reduc, bool *reduc_chain_p)
{
gphi *phi = as_a <gphi *> (phi_info->stmt);
gimple *phi_use_stmt = NULL;
@@ -2862,6 +2874,7 @@ vect_is_simple_reduction (loop_vec_info
use_operand_p use_p;
*double_reduc = false;
+ *reduc_chain_p = false;
STMT_VINFO_REDUC_TYPE (phi_info) = TREE_CODE_REDUCTION;
tree phi_name = PHI_RESULT (phi);
@@ -3036,6 +3049,7 @@ vect_is_simple_reduction (loop_vec_info
LOOP_VINFO_REDUCTION_CHAINS (loop_info).safe_push (reduc_chain[0]);
REDUC_GROUP_SIZE (reduc_chain[0]) = reduc_chain.length ();
+ *reduc_chain_p = true;
if (dump_enabled_p ())
dump_printf_loc (MSG_NOTE, vect_location,
"reduction: detected reduction chain\n");
===================================================================
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-ftree-vectorize" } */
+
+long int x1;
+int fr;
+
+int
+us (int sk, int jx)
+{
+ while (sk < 1)
+ {
+ jx *= 2;
+ fr += x1 + 1;
+ ++sk;
+ }
+
+ return jx;
+}