diff mbox series

[072/nnn] poly_int: vectorizable_live_operation

Message ID 878tg1ixhc.fsf@linaro.org
State New
Headers show
Series [072/nnn] poly_int: vectorizable_live_operation | expand

Commit Message

Richard Sandiford Oct. 23, 2017, 5:29 p.m. UTC 
This patch makes vectorizable_live_operation cope with variable-length
vectors.  For now we just handle cases in which we can tell at compile
time which vector contains the final result.


2017-10-23  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* tree-vect-loop.c (vectorizable_live_operation): Treat the number
	of units as polynomial.  Punt if we can't tell at compile time
	which vector contains the final result.

Comments

Jeff Law Nov. 28, 2017, 4:45 p.m. UTC | #1 
On 10/23/2017 11:29 AM, Richard Sandiford wrote:
> This patch makes vectorizable_live_operation cope with variable-length
> vectors.  For now we just handle cases in which we can tell at compile
> time which vector contains the final result.
> 
> 
> 2017-10-23  Richard Sandiford  <richard.sandiford@linaro.org>
> 	    Alan Hayward  <alan.hayward@arm.com>
> 	    David Sherwood  <david.sherwood@arm.com>
> 
> gcc/
> 	* tree-vect-loop.c (vectorizable_live_operation): Treat the number
> 	of units as polynomial.  Punt if we can't tell at compile time
> 	which vector contains the final result.
OK.
jeff
diff mbox series

Patch

Index: gcc/tree-vect-loop.c
===================================================================
--- gcc/tree-vect-loop.c	2017-10-23 17:22:36.904793787 +0100
+++ gcc/tree-vect-loop.c	2017-10-23 17:22:37.879692661 +0100
@@ -7132,10 +7132,12 @@  vectorizable_live_operation (gimple *stm
   imm_use_iterator imm_iter;
   tree lhs, lhs_type, bitsize, vec_bitsize;
   tree vectype = STMT_VINFO_VECTYPE (stmt_info);
-  int nunits = TYPE_VECTOR_SUBPARTS (vectype);
+  poly_uint64 nunits = TYPE_VECTOR_SUBPARTS (vectype);
   int ncopies;
   gimple *use_stmt;
   auto_vec<tree> vec_oprnds;
+  int vec_entry = 0;
+  poly_uint64 vec_index = 0;
 
   gcc_assert (STMT_VINFO_LIVE_P (stmt_info));
 
@@ -7164,6 +7166,30 @@  vectorizable_live_operation (gimple *stm
   else
     ncopies = vect_get_num_copies (loop_vinfo, vectype);
 
+  if (slp_node)
+    {
+      gcc_assert (slp_index >= 0);
+
+      int num_scalar = SLP_TREE_SCALAR_STMTS (slp_node).length ();
+      int num_vec = SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node);
+
+      /* Get the last occurrence of the scalar index from the concatenation of
+	 all the slp vectors. Calculate which slp vector it is and the index
+	 within.  */
+      poly_uint64 pos = (num_vec * nunits) - num_scalar + slp_index;
+
+      /* Calculate which vector contains the result, and which lane of
+	 that vector we need.  */
+      if (!can_div_trunc_p (pos, nunits, &vec_entry, &vec_index))
+	{
+	  if (dump_enabled_p ())
+	    dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+			     "Cannot determine which vector holds the"
+			     " final result.\n");
+	  return false;
+	}
+    }
+
   if (!vec_stmt)
     /* No transformation required.  */
     return true;
@@ -7185,18 +7211,6 @@  vectorizable_live_operation (gimple *stm
   tree vec_lhs, bitstart;
   if (slp_node)
     {
-      gcc_assert (slp_index >= 0);
-
-      int num_scalar = SLP_TREE_SCALAR_STMTS (slp_node).length ();
-      int num_vec = SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node);
-
-      /* Get the last occurrence of the scalar index from the concatenation of
-	 all the slp vectors. Calculate which slp vector it is and the index
-	 within.  */
-      int pos = (num_vec * nunits) - num_scalar + slp_index;
-      int vec_entry = pos / nunits;
-      int vec_index = pos % nunits;
-
       /* Get the correct slp vectorized stmt.  */
       vec_lhs = gimple_get_lhs (SLP_TREE_VEC_STMTS (slp_node)[vec_entry]);