+2001-08-08 Jason Merrill <jason_merrill@redhat.com>
+
+ * alias.c (get_alias_set): Return a previously calculated
+ alias set for a VAR_DECL.
+ * function.c (gen_mem_addressof): Calculate the alias set before
+ touching the RTL.
+
Wed Aug 8 18:44:37 CEST 2001 Jan Hubicka <jh@suse.cz>
* predict.def: Set hitrates according our experimental run.
return 0;
}
+ /* If we've already determined the alias set for this decl, just
+ return it. This is necessary for C++ anonymous unions, whose
+ component variables don't look like union members (boo!). */
+ if (TREE_CODE (t) == VAR_DECL
+ && DECL_RTL_SET_P (t) && GET_CODE (DECL_RTL (t)) == MEM)
+ return MEM_ALIAS_SET (DECL_RTL (t));
+
/* Give the language another chance to do something special. */
if (orig_t != t
&& (set = lang_get_alias_set (t)) != -1)
rtx r = gen_rtx_ADDRESSOF (Pmode, gen_reg_rtx (GET_MODE (reg)),
REGNO (reg), decl);
+ /* Calculate this before we start messing with decl's RTL. */
+ HOST_WIDE_INT set = get_alias_set (decl);
+
/* If the original REG was a user-variable, then so is the REG whose
address is being taken. Likewise for unchanging. */
REG_USERVAR_P (XEXP (r, 0)) = REG_USERVAR_P (reg);
PUT_MODE (reg, decl_mode);
MEM_VOLATILE_P (reg) = TREE_SIDE_EFFECTS (decl);
MEM_SET_IN_STRUCT_P (reg, AGGREGATE_TYPE_P (type));
- set_mem_alias_set (reg, get_alias_set (decl));
+ set_mem_alias_set (reg, set);
if (TREE_USED (decl) || DECL_INITIAL (decl) != 0)
fixup_var_refs (reg, GET_MODE (reg), TREE_UNSIGNED (type), 0);
// Test that type punning using an anonymous union works with strict aliasing.
-// { dg-do run { xfail *-*-* } }
+// { dg-do run }
// { dg-options "-O2 -fstrict-aliasing" }
extern "C" void abort ();