* tree-dfa.c (add_referenced_var): Only global variables are

	call-clobbered.
	* tree-flow.h (struct ptr_info_def): Add field pt_global_mem.
	* tree-ssa-alias.c (compute_points_to_and_addr_escape): Mark
	all pointers dereferenced if the statement dereferences them.
	(create_name_tags): Do not create memory tags for pointers
	that have PT_ANYTHING set.
	Also check if PT_VARS is not empty before creating a name tag.
	(compute_flow_sensitive_aliasing): Don't mark call-clobbered
	variables that share the same alias set with a pointer that
	may point anywhere.
	(add_may_alias): Add FIXME comment to remove clobbering
	aliased variables and tags.
	(replace_may_alias): Likewise.
	(set_pt_anything): Do not clear PT_VARS nor IS_DEREFERENCED.
	(merge_pointed_to_info): If the original variable has not
	points-to information, call set_pt_anything.
	(add_pointed_to_var): Do not prevent adding a pointed-to
	variable if the pointers is PT_ANYTHING.
	If the variable is a global, set PT_GLOBAL_MEM.
	(collect_points_to_info_r): Don't assume that PLUS_EXPRs of
	pointer type only come in PTR+OFFSET flavours.
	Always call merge_pointed_to_info on PHI arguments that are
	SSA_NAMEs.
	(get_nmt_for): Mark call-clobbered tags whose pointer points
	to global memory.
	* tree-ssa-operands.c (opf_kill_def, opf_no_vops): Switch
	values.
	(get_indirect_ref_operands): Always clear OPF_KILL_DEF from
	FLAGS.
	(add_stmt_operand): Abort if the caller tried to add a killing
	definition for a memory tag.
	* tree-ssa.c (verify_flow_sensitive_alias_info): Remove
	unnecessary checks.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@86198 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 2 insertions, 4 deletions

diff --git a/gcc/tree-dfa.c b/gcc/tree-dfa.c
index 0273406df84..b8a9b03324f 100644
--- a/gcc/tree-dfa.c
+++ b/gcc/tree-dfa.c
@@ -903,10 +903,8 @@ add_referenced_var (tree var, struct walk_state *walk_state)
       v_ann->uid = num_referenced_vars;
       VARRAY_PUSH_TREE (referenced_vars, var);
 
-      /* Initially assume that all memory variables are
-	 call-clobbered.  This will be refined later by the alias
-	 analyzer.  */
-      if (needs_to_live_in_memory (var))
+      /* Global variables are always call-clobbered.  */
+      if (is_global_var (var))
 	mark_call_clobbered (var);
 
       /* If an initialized global variable then register the initializer