middle-end: Store and use the SLP instance kind when aborting load/store lanes

This patch stores the SLP instance kind in the SLP instance so that we can use
it later when detecting load/store lanes support.

This also changes the load/store lane support check to only check if the SLP
kind is a store.  This means that in order for the load/lanes to work all
instances must be of kind store.

gcc/ChangeLog:

	* tree-vect-loop.c (vect_analyze_loop_2): Check kind.
	* tree-vect-slp.c (vect_build_slp_instance): New.
	(enum slp_instance_kind): Move to...
	* tree-vectorizer.h (enum slp_instance_kind): .. Here
	(SLP_INSTANCE_KIND): New.

1 files changed, 13 insertions, 0 deletions

diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h
index 0252d79..3ccd0fd 100644
--- a/gcc/tree-vectorizer.h
+++ b/gcc/tree-vectorizer.h
@@ -174,6 +174,15 @@ struct _slp_tree {
   static void operator delete (void *, size_t);
 };
 
+/* The enum describes the type of operations that an SLP instance
+   can perform. */
+
+enum slp_instance_kind {
+    slp_inst_kind_store,
+    slp_inst_kind_reduc_group,
+    slp_inst_kind_reduc_chain,
+    slp_inst_kind_ctor
+};
 
 /* SLP instance is a sequence of stmts in a loop that can be packed into
    SIMD stmts.  */
@@ -202,6 +211,9 @@ public:
      entries into the same subgraph, including itself.  */
   vec<_slp_instance *> subgraph_entries;
 
+  /* The type of operation the SLP instance is performing.  */
+  slp_instance_kind kind;
+
   dump_user_location_t location () const;
 } *slp_instance;
 
@@ -211,6 +223,7 @@ public:
 #define SLP_INSTANCE_UNROLLING_FACTOR(S)         (S)->unrolling_factor
 #define SLP_INSTANCE_LOADS(S)                    (S)->loads
 #define SLP_INSTANCE_ROOT_STMT(S)                (S)->root_stmt
+#define SLP_INSTANCE_KIND(S)                     (S)->kind
 
 #define SLP_TREE_CHILDREN(S)                     (S)->children
 #define SLP_TREE_SCALAR_STMTS(S)                 (S)->stmts