Mostly revert r254296

r254296 added support for (const ...) wrappers around vectors,
but in the end the agreement was to use a variable-length
encoding of CONST_VECTOR (and VECTOR_CST) instead.  This patch
therefore reverts the bits that are no longer needed.

The rtl.texi part isn't a full revert, since r254296 also updated the
documentation to mention unspecs in address calculations, and to relax
the requirement that the mode had to be Pmode.

2018-01-10  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* doc/rtl.texi: Remove documentation of (const ...) wrappers
	for vectors, as a partial revert of r254296.
	* rtl.h (const_vec_p): Delete.
	(const_vec_duplicate_p): Don't test for vector CONSTs.
	(unwrap_const_vec_duplicate, const_vec_series_p): Likewise.
	* expmed.c (make_tree): Likewise.

	Revert:
	* common.md (E, F): Use CONSTANT_P instead of checking for
	CONST_VECTOR.
	* emit-rtl.c (gen_lowpart_common): Use const_vec_p instead of
	checking for CONST_VECTOR.

From-SVN: r256421

1 files changed, 1 insertions, 16 deletions

diff --git a/gcc/expmed.c b/gcc/expmed.c
index 808b067..f34ed93 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -5355,22 +5355,7 @@ make_tree (tree type, rtx x)
       return fold_convert (type, make_tree (t, XEXP (x, 0)));
 
     case CONST:
-      {
-	rtx op = XEXP (x, 0);
-	if (GET_CODE (op) == VEC_DUPLICATE)
-	  {
-	    tree elt_tree = make_tree (TREE_TYPE (type), XEXP (op, 0));
-	    return build_vector_from_val (type, elt_tree);
-	  }
-	if (GET_CODE (op) == VEC_SERIES)
-	  {
-	    tree itype = TREE_TYPE (type);
-	    tree base_tree = make_tree (itype, XEXP (op, 0));
-	    tree step_tree = make_tree (itype, XEXP (op, 1));
-	    return build_vec_series (type, base_tree, step_tree);
-	  }
-	return make_tree (type, op);
-      }
+      return make_tree (type, XEXP (x, 0));
 
     case SYMBOL_REF:
       t = SYMBOL_REF_DECL (x);