[committed] Fix BUILT_IN_ASSUME_ALIGNED handling in find_func_aliases_for_builtin_call

[committed] Fix BUILT_IN_ASSUME_ALIGNED handling in find_func_aliases_for_builtin_call

[Jakub Jelinek]

Hi!

__builtin_assume_aligned here needs to be handled just like a lhs = dest
assignment, while for memcpy/etc. resp. memset/etc. it was doing some
further processing, undesirable for this builtin.
Fixed thusly, tested on x86_64-linux, acked by Richi on IRC, committed to
trunk.

2011-06-30  Jakub Jelinek  <jakub@redhat.com>

	* tree-ssa-structalias.c (find_func_aliases_for_builtin_call): Fix
	handling of BUILT_IN_ASSUME_ALIGNED.

--- gcc/tree-ssa-structalias.c.jj	2011-06-30 10:05:04.000000000 +0200
+++ gcc/tree-ssa-structalias.c	2011-06-30 11:02:01.462671158 +0200
@@ -4002,7 +4002,6 @@ find_func_aliases_for_builtin_call (gimp
       case BUILT_IN_STPCPY_CHK:
       case BUILT_IN_STRCAT_CHK:
       case BUILT_IN_STRNCAT_CHK:
-      case BUILT_IN_ASSUME_ALIGNED:
 	{
 	  tree res = gimple_call_lhs (t);
 	  tree dest = gimple_call_arg (t, (DECL_FUNCTION_CODE (fndecl)
@@ -4068,6 +4067,20 @@ find_func_aliases_for_builtin_call (gimp
 	  VEC_free (ce_s, heap, lhsc);
 	  return true;
 	}
+      case BUILT_IN_ASSUME_ALIGNED:
+	{
+	  tree res = gimple_call_lhs (t);
+	  tree dest = gimple_call_arg (t, 0);
+	  if (res != NULL_TREE)
+	    {
+	      get_constraint_for (res, &lhsc);
+	      get_constraint_for (dest, &rhsc);
+	      process_all_all_constraints (lhsc, rhsc);
+	      VEC_free (ce_s, heap, lhsc);
+	      VEC_free (ce_s, heap, rhsc);
+	    }
+	  return true;
+	}
       /* All the following functions do not return pointers, do not
 	 modify the points-to sets of memory reachable from their
 	 arguments and do not add to the ESCAPED solution.  */

	Jakub