2012-05-03 Martin Jambor <mjambor@suse.cz>

	* builtins.c (get_object_alignment_1): Return whether we can determine
	the alignment or conservatively assume byte alignment.  Return the
	alignment by reference.  Use get_pointer_alignment_1 for dereference
	alignment.
	(get_pointer_alignment_1): Return whether we can determine the
	alignment or conservatively assume byte alignment.  Return the
	alignment by reference.  Use get_ptr_info_alignment to get SSA name
	alignment.
	(get_object_alignment): Update call to get_object_alignment_1.
	(get_object_or_type_alignment): Likewise, fall back to type alignment
	only when it returned false.
	(get_pointer_alignment): Update call to get_pointer_alignment_1.
	* fold-const.c (get_pointer_modulus_and_residue): Update call to
	get_object_alignment_1.
	* ipa-prop.c (ipa_modify_call_arguments): Update call to
	get_pointer_alignment_1.
	* tree-sra.c (build_ref_for_offset): Likewise, fall back to the type
	of MEM_REF or TARGET_MEM_REF only when it returns false.
	* tree-ssa-ccp.c (get_value_from_alignment): Update call to
	get_object_alignment_1.
	(ccp_finalize): Use set_ptr_info_alignment.
	* tree.h (get_object_alignment_1): Update declaration.
	(get_pointer_alignment_1): Likewise.
	* gimple-pretty-print.c (dump_gimple_phi): Use get_ptr_info_alignment.
	(dump_gimple_stmt): Likewise.
	* tree-flow.h (ptr_info_def): Updated comments of fields align and
	misalign.
	(get_ptr_info_alignment): Declared.
	(mark_ptr_info_alignment_unknown): Likewise.
	(set_ptr_info_alignment): Likewise.
	(adjust_ptr_info_misalignment): Likewise.
	* tree-ssa-address.c (copy_ref_info): Use new access functions to get
	and set alignment of SSA names.
	* tree-ssa-loop-ivopts.c (rewrite_use_nonlinear_expr): Call
	mark_ptr_info_alignment_unknown.
	* tree-ssanames.c (get_ptr_info_alignment): New function.
	(mark_ptr_info_alignment_unknown): Likewise.
	(set_ptr_info_alignment): Likewise.
	(adjust_ptr_info_misalignment): Likewise.
	(get_ptr_info): Call mark_ptr_info_alignment_unknown.
	* tree-vect-data-refs.c (vect_create_addr_base_for_vector_ref):
	Likewise.
	(bump_vector_ptr): Likewise.
	* tree-vect-stmts.c (create_array_ref): Use set_ptr_info_alignment.
	(vectorizable_store): Likewise.
	(vectorizable_load): Likewise.



git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@187101 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 16 insertions, 4 deletions

diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h
index 794047bc7f0..315d9558d14 100644
--- a/gcc/tree-flow.h
+++ b/gcc/tree-flow.h
@@ -136,12 +136,17 @@ struct GTY(()) ptr_info_def
      align and misalign specify low known bits of the pointer.
      ptr & (align - 1) == misalign.  */
 
-  /* The power-of-two byte alignment of the object this pointer
-     points into.  This is usually DECL_ALIGN_UNIT for decls and
-     MALLOC_ABI_ALIGNMENT for allocated storage.  */
+  /* When known, this is the power-of-two byte alignment of the object this
+     pointer points into.  This is usually DECL_ALIGN_UNIT for decls and
+     MALLOC_ABI_ALIGNMENT for allocated storage.  When the alignment is not
+     known, it is zero.  Do not access directly but use functions
+     get_ptr_info_alignment, set_ptr_info_alignment,
+     mark_ptr_info_alignment_unknown and similar.  */
   unsigned int align;
 
-  /* The byte offset this pointer differs from the above alignment.  */
+  /* When alignment is known, the byte offset this pointer differs from the
+     above alignment.  Access only through the same helper functions as align
+     above.  */
   unsigned int misalign;
 };
 
@@ -593,6 +598,13 @@ extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *);
 extern void release_ssa_name (tree);
 extern void release_defs (gimple);
 extern void replace_ssa_name_symbol (tree, tree);
+extern bool get_ptr_info_alignment (struct ptr_info_def *, unsigned int *,
+				    unsigned int *);
+extern void mark_ptr_info_alignment_unknown (struct ptr_info_def *);
+extern void set_ptr_info_alignment (struct ptr_info_def *, unsigned int,
+				    unsigned int);
+extern void adjust_ptr_info_misalignment (struct ptr_info_def *,
+					  unsigned int);
 
 #ifdef GATHER_STATISTICS
 extern void ssanames_print_statistics (void);