RISC-V: Extract vec_series for expand_const_vector [NFC]

Consider the expand_const_vector is quit long (about 500 lines)
and complicated, we would like to extract the different case
into different functions.  For example, the const vec_series
will be extracted into expand_const_vec_series.

The below test suites are passed for this patch.
* The rv64gcv fully regression test.

gcc/ChangeLog:

	* config/riscv/riscv-v.cc (expand_const_vec_series): Add new
	func to take care of the const vec_series.
	(expand_const_vector): Extract const vec_series into separated
	function.

Signed-off-by: Pan Li <pan2.li@intel.com>

1 files changed, 13 insertions, 7 deletions

diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index 1eb14a24..e0af296 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -1225,6 +1225,18 @@ expand_const_vec_duplicate (rtx target, rtx src, rtx elt)
 }
 
 static void
+expand_const_vec_series (rtx target, rtx base, rtx step)
+{
+  machine_mode mode = GET_MODE (target);
+  rtx result = register_operand (target, mode) ? target : gen_reg_rtx (mode);
+
+  expand_vec_series (result, base, step);
+
+  if (result != target)
+    emit_move_insn (target, result);
+}
+
+static void
 expand_const_vector (rtx target, rtx src)
 {
   machine_mode mode = GET_MODE (target);
@@ -1237,13 +1249,7 @@ expand_const_vector (rtx target, rtx src)
   /* Support scalable const series vector.  */
   rtx base, step;
   if (const_vec_series_p (src, &base, &step))
-    {
-      expand_vec_series (result, base, step);
-
-      if (result != target)
-	emit_move_insn (target, result);
-      return;
-    }
+    return expand_const_vec_series (target, base, step);
 
   /* Handle variable-length vector.  */
   unsigned int nelts_per_pattern = CONST_VECTOR_NELTS_PER_PATTERN (src);