Hi!
Since a recent change, TYPE_ALIAS_SET of types can change during folding.
This patch arranges for it not to be checksummed.
Bootstrapped/regtested on x86_64-linux and i686-linux (normal bootstrap)
and built (nonbootstrap) + regtested the
--enable-checking=yes,extra,fold,rtl version (previously it wouldn't build
even libgcc).
Ok for trunk?
2016-05-13 Jakub Jelinek <ja...@redhat.com>
PR bootstrap/71071
* fold-const.c (fold_checksum_tree): Allow modification
of TYPE_ALIAS_SET during folding.
* gcc.dg/pr71071.c: New test.
--- gcc/fold-const.c.jj 2016-05-13 13:58:12.381020172 +0200
+++ gcc/fold-const.c 2016-05-13 14:22:51.724912335 +0200
@@ -12130,7 +12130,8 @@ fold_checksum_tree (const_tree expr, str
|| TYPE_REFERENCE_TO (expr)
|| TYPE_CACHED_VALUES_P (expr)
|| TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr)
- || TYPE_NEXT_VARIANT (expr)))
+ || TYPE_NEXT_VARIANT (expr)
+ || TYPE_ALIAS_SET_KNOWN_P (expr)))
{
/* Allow these fields to be modified. */
tree tmp;
@@ -12140,6 +12141,7 @@ fold_checksum_tree (const_tree expr, str
TYPE_POINTER_TO (tmp) = NULL;
TYPE_REFERENCE_TO (tmp) = NULL;
TYPE_NEXT_VARIANT (tmp) = NULL;
+ TYPE_ALIAS_SET (tmp) = -1;
if (TYPE_CACHED_VALUES_P (tmp))
{
TYPE_CACHED_VALUES_P (tmp) = 0;
--- gcc/testsuite/gcc.dg/pr71071.c.jj 2016-05-13 14:23:39.528278177 +0200
+++ gcc/testsuite/gcc.dg/pr71071.c 2016-05-13 14:22:08.000000000 +0200
@@ -0,0 +1,12 @@
+/* PR bootstrap/71071 */
+/* { dg-do compile } *
+/* { dg-options "-O2" } */
+
+struct S { unsigned b : 1; } a;
+
+void
+foo ()
+{
+ if (a.b)
+ ;
+}
Jakub
