2007-07-12 Dorit Nuzman <dorit@il.ibm.com>

            Devang Patel  <dpatel@apple.com>

        PR tree-optimization/25413
        * targhooks.c (default_builtin_vector_alignment_reachable): New.
        * targhooks.h (default_builtin_vector_alignment_reachable): New.
        * tree.h (contains_packed_reference): New.
        * expr.c (contains_packed_reference): New.
        * tree-vect-analyze.c (vector_alignment_reachable_p): New.
        (vect_enhance_data_refs_alignment): Call
        vector_alignment_reachable_p.
        * target.h (vector_alignment_reachable): New builtin.
        * target-def.h (TARGET_VECTOR_ALIGNMENT_REACHABLE): New.
        * config/rs6000/rs6000.c (rs6000_vector_alignment_reachable): New.
        (TARGET_VECTOR_ALIGNMENT_REACHABLE): Define.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@126591 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 35 insertions, 0 deletions

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 722a5a6c342..c9c5a19f878 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -717,6 +717,7 @@ static tree rs6000_builtin_mul_widen_odd (tree);
 static tree rs6000_builtin_conversion (enum tree_code, tree);
 
 static void def_builtin (int, const char *, tree, int);
+static bool rs6000_vector_alignment_reachable (tree, bool);
 static void rs6000_init_builtins (void);
 static rtx rs6000_expand_unop_builtin (enum insn_code, tree, rtx);
 static rtx rs6000_expand_binop_builtin (enum insn_code, tree, rtx);
@@ -984,6 +985,9 @@ static const char alt_reg_names[][8] =
 #undef TARGET_VECTORIZE_BUILTIN_CONVERSION
 #define TARGET_VECTORIZE_BUILTIN_CONVERSION rs6000_builtin_conversion
 
+#undef TARGET_VECTOR_ALIGNMENT_REACHABLE
+#define TARGET_VECTOR_ALIGNMENT_REACHABLE rs6000_vector_alignment_reachable
+
 #undef TARGET_INIT_BUILTINS
 #define TARGET_INIT_BUILTINS rs6000_init_builtins
 
@@ -1806,6 +1810,37 @@ rs6000_builtin_mul_widen_odd (tree type)
     }
 }
 
+
+/* Return true iff, data reference of TYPE can reach vector alignment (16)
+   after applying N number of iterations.  This routine does not determine
+   how may iterations are required to reach desired alignment.  */
+
+static bool
+rs6000_vector_alignment_reachable (tree type ATTRIBUTE_UNUSED, bool is_packed)
+{
+  if (is_packed)
+    return false;
+
+  if (TARGET_32BIT)
+    {
+      if (rs6000_alignment_flags == MASK_ALIGN_NATURAL)
+        return true;
+
+      if (rs6000_alignment_flags ==  MASK_ALIGN_POWER)
+        return true;
+
+      return false;
+    }
+  else
+    {
+      if (TARGET_MACHO)
+        return false;
+
+      /* Assuming that all other types are naturally aligned. CHECKME!  */
+      return true;
+    }
+}
+
 /* Handle generic options of the form -mfoo=yes/no.
    NAME is the option name.
    VALUE is the option value.