rs6000.c (rs6000_builtin_valid_without_lhs): Add vec_xst variants to the list.

[gcc]

2018-08-13 Will Schmidt <will_schmidt@vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_builtin_valid_without_lhs): Add
	vec_xst variants to the list.
	(rs6000_gimple_fold_builtin): Add support for folding unaligned
	vector loads and stores.

From-SVN: r263512

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 855da9d03d7a34de62f2620e386bc397fc5cd1ee..00b03c9d1d4ce7ad976a205c13a0d1a3e8f2f951 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-08-13 Will Schmidt <will_schmidt@vnet.ibm.com>
+
+       * config/rs6000/rs6000.c (rs6000_builtin_valid_without_lhs): Add
+       vec_xst variants to the list.
+       (rs6000_gimple_fold_builtin): Add support for folding unaligned
+       vector loads and stores.
+
 2018-08-13  David Edelsohn  <dje.gcc@gmail.com>
 
        * config.gcc (rs6000-ibm-aix4.x): Delete.

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index c2af4b869073c082877db069c99b5239bca69172..9a1fb7da4f3b00a6bca8f57812813511d89538cc 100644 (file)
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -15069,6 +15069,12 @@ rs6000_builtin_valid_without_lhs (enum rs6000_builtins fn_code)
     case ALTIVEC_BUILTIN_STVX_V4SF:
     case ALTIVEC_BUILTIN_STVX_V2DI:
     case ALTIVEC_BUILTIN_STVX_V2DF:
+    case VSX_BUILTIN_STXVW4X_V16QI:
+    case VSX_BUILTIN_STXVW4X_V8HI:
+    case VSX_BUILTIN_STXVW4X_V4SF:
+    case VSX_BUILTIN_STXVW4X_V4SI:
+    case VSX_BUILTIN_STXVD2X_V2DF:
+    case VSX_BUILTIN_STXVD2X_V2DI:
       return true;
     default:
       return false;
@@ -15578,6 +15584,77 @@ rs6000_gimple_fold_builtin (gimple_stmt_iterator *gsi)
        return true;
       }
 
+    /* unaligned Vector loads.  */
+    case VSX_BUILTIN_LXVW4X_V16QI:
+    case VSX_BUILTIN_LXVW4X_V8HI:
+    case VSX_BUILTIN_LXVW4X_V4SF:
+    case VSX_BUILTIN_LXVW4X_V4SI:
+    case VSX_BUILTIN_LXVD2X_V2DF:
+    case VSX_BUILTIN_LXVD2X_V2DI:
+      {
+        arg0 = gimple_call_arg (stmt, 0);  // offset
+        arg1 = gimple_call_arg (stmt, 1);  // address
+        lhs = gimple_call_lhs (stmt);
+        location_t loc = gimple_location (stmt);
+        /* Since arg1 may be cast to a different type, just use ptr_type_node
+           here instead of trying to enforce TBAA on pointer types.  */
+        tree arg1_type = ptr_type_node;
+        tree lhs_type = TREE_TYPE (lhs);
+        /* In GIMPLE the type of the MEM_REF specifies the alignment.  The
+          required alignment (power) is 4 bytes regardless of data type.  */
+        tree align_ltype = build_aligned_type (lhs_type, 4);
+        /* POINTER_PLUS_EXPR wants the offset to be of type 'sizetype'.  Create
+           the tree using the value from arg0.  The resulting type will match
+           the type of arg1.  */
+        gimple_seq stmts = NULL;
+        tree temp_offset = gimple_convert (&stmts, loc, sizetype, arg0);
+        tree temp_addr = gimple_build (&stmts, loc, POINTER_PLUS_EXPR,
+                                      arg1_type, arg1, temp_offset);
+        gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
+        /* Use the build2 helper to set up the mem_ref.  The MEM_REF could also
+           take an offset, but since we've already incorporated the offset
+           above, here we just pass in a zero.  */
+        gimple *g;
+        g = gimple_build_assign (lhs, build2 (MEM_REF, align_ltype, temp_addr,
+                                               build_int_cst (arg1_type, 0)));
+        gimple_set_location (g, loc);
+        gsi_replace (gsi, g, true);
+        return true;
+      }
+
+    /* unaligned Vector stores.  */
+    case VSX_BUILTIN_STXVW4X_V16QI:
+    case VSX_BUILTIN_STXVW4X_V8HI:
+    case VSX_BUILTIN_STXVW4X_V4SF:
+    case VSX_BUILTIN_STXVW4X_V4SI:
+    case VSX_BUILTIN_STXVD2X_V2DF:
+    case VSX_BUILTIN_STXVD2X_V2DI:
+      {
+        arg0 = gimple_call_arg (stmt, 0); /* Value to be stored.  */
+        arg1 = gimple_call_arg (stmt, 1); /* Offset.  */
+        tree arg2 = gimple_call_arg (stmt, 2); /* Store-to address.  */
+        location_t loc = gimple_location (stmt);
+        tree arg0_type = TREE_TYPE (arg0);
+        /* Use ptr_type_node (no TBAA) for the arg2_type.  */
+        tree arg2_type = ptr_type_node;
+        /* In GIMPLE the type of the MEM_REF specifies the alignment.  The
+           required alignment (power) is 4 bytes regardless of data type.  */
+        tree align_stype = build_aligned_type (arg0_type, 4);
+        /* POINTER_PLUS_EXPR wants the offset to be of type 'sizetype'.  Create
+           the tree using the value from arg1.  */
+        gimple_seq stmts = NULL;
+        tree temp_offset = gimple_convert (&stmts, loc, sizetype, arg1);
+        tree temp_addr = gimple_build (&stmts, loc, POINTER_PLUS_EXPR,
+                                      arg2_type, arg2, temp_offset);
+        gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
+        gimple *g;
+        g = gimple_build_assign (build2 (MEM_REF, align_stype, temp_addr,
+                                          build_int_cst (arg2_type, 0)), arg0);
+        gimple_set_location (g, loc);
+        gsi_replace (gsi, g, true);
+        return true;
+      }
+
     /* Vector Fused multiply-add (fma).  */
     case ALTIVEC_BUILTIN_VMADDFP:
     case VSX_BUILTIN_XVMADDDP: