re PR target/92904 (varargs for __int128 is placed at an unaligned location and…

re PR target/92904 (varargs for __int128 is placed at an unaligned location and uses movdqa for the load)

	PR target/92904
	* config/i386/i386.c (ix86_gimplify_va_arg): If need_intregs and
	not need_temp, decrease alignment of the read because the GPR save
	area only guarantees 8-byte alignment.

	* gcc.c-torture/execute/pr92904.c: New test.

From-SVN: r279327

gcc/ChangeLog

+2019-12-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/92904
+	* config/i386/i386.c (ix86_gimplify_va_arg): If need_intregs and
+	not need_temp, decrease alignment of the read because the GPR save
+	area only guarantees 8-byte alignment.
+
 2019-12-12  Georg-Johann Lay  <avr@gjlay.de>
 
 	Add support for some more AVR devices from avrxmega3 family.

gcc/config/i386/i386.c

@@ -4277,6 +4277,7 @@ ix86_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
   tree ptrtype;
   machine_mode nat_mode;
   unsigned int arg_boundary;
+  unsigned int type_align;
 
   /* Only 64bit target needs something special.  */
   if (is_va_list_char_pointer (TREE_TYPE (valist)))
@@ -4334,6 +4335,7 @@ ix86_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
   /* Pull the value out of the saved registers.  */
 
   addr = create_tmp_var (ptr_type_node, "addr");
+  type_align = TYPE_ALIGN (type);
 
   if (container)
     {
@@ -4504,6 +4506,9 @@ ix86_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
 	  t = build2 (PLUS_EXPR, TREE_TYPE (gpr), gpr,
 		      build_int_cst (TREE_TYPE (gpr), needed_intregs * 8));
 	  gimplify_assign (gpr, t, pre_p);
+	  /* The GPR save area guarantees only 8-byte alignment.  */
+	  if (!need_temp)
+	    type_align = MIN (type_align, 64);
 	}
 
       if (needed_sseregs)
@@ -4548,6 +4553,7 @@ ix86_gimplify_va_arg (tree valist, tree type, gimple_seq *pre_p,
   if (container)
     gimple_seq_add_stmt (pre_p, gimple_build_label (lab_over));
 
+  type = build_aligned_type (type, type_align);
   ptrtype = build_pointer_type_for_mode (type, ptr_mode, true);
   addr = fold_convert (ptrtype, addr);
 

gcc/testsuite/ChangeLog

+2019-12-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/92904
+	* gcc.c-torture/execute/pr92904.c: New test.
+
 2019-12-12  Harald Anlauf  <anlauf@gmx.de>
 
 	PR fortran/92898