Directly operate on CONST_VECTOR encoding

This patch makes some pieces of code operate directly on the new
CONST_VECTOR encoding.

2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* cse.c (hash_rtx_cb): Hash only the encoded elements.
	* cselib.c (cselib_hash_rtx): Likewise.
	* expmed.c (make_tree): Build VECTOR_CSTs directly from the
	CONST_VECTOR encoding.

From-SVN: r256192

gcc/ChangeLog

+2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	* cse.c (hash_rtx_cb): Hash only the encoded elements.
+	* cselib.c (cselib_hash_rtx): Likewise.
+	* expmed.c (make_tree): Build VECTOR_CSTs directly from the
+	CONST_VECTOR encoding.
+
 2017-01-03  Jakub Jelinek  <jakub@redhat.com>
 	    Jeff Law  <law@redhat.com>
 

gcc/cse.c

@@ -2353,11 +2353,11 @@ hash_rtx_cb (const_rtx x, machine_mode mode,
 	int units;
 	rtx elt;
 
-	units = CONST_VECTOR_NUNITS (x);
+	units = const_vector_encoded_nelts (x);
 
 	for (i = 0; i < units; ++i)
 	  {
-	    elt = CONST_VECTOR_ELT (x, i);
+	    elt = CONST_VECTOR_ENCODED_ELT (x, i);
 	    hash += hash_rtx_cb (elt, GET_MODE (elt),
                                  do_not_record_p, hash_arg_in_memory_p,
                                  have_reg_qty, cb);

gcc/cselib.c

@@ -1163,11 +1163,11 @@ cselib_hash_rtx (rtx x, int create, machine_mode memmode)
 	int units;
 	rtx elt;
 
-	units = CONST_VECTOR_NUNITS (x);
+	units = const_vector_encoded_nelts (x);
 
 	for (i = 0; i < units; ++i)
 	  {
-	    elt = CONST_VECTOR_ELT (x, i);
+	    elt = CONST_VECTOR_ENCODED_ELT (x, i);
 	    hash += cselib_hash_rtx (elt, 0, memmode);
 	  }
 

gcc/expmed.c

@@ -5273,13 +5273,14 @@ make_tree (tree type, rtx x)
 
     case CONST_VECTOR:
       {
-	int units = CONST_VECTOR_NUNITS (x);
+	unsigned int npatterns = CONST_VECTOR_NPATTERNS (x);
+	unsigned int nelts_per_pattern = CONST_VECTOR_NELTS_PER_PATTERN (x);
 	tree itype = TREE_TYPE (type);
-	int i;
 
 	/* Build a tree with vector elements.  */
-	tree_vector_builder elts (type, units, 1);
-	for (i = 0; i < units; ++i)
+	tree_vector_builder elts (type, npatterns, nelts_per_pattern);
+	unsigned int count = elts.encoded_nelts ();
+	for (unsigned int i = 0; i < count; ++i)
 	  {
 	    rtx elt = CONST_VECTOR_ELT (x, i);
 	    elts.quick_push (make_tree (itype, elt));