fold_convert can fail for certain types. It can fail either by
returning a error_mark_node or triggering a gcc_assert depending on the
exact situation.
Both are problematical. This patch checks that we can convert
integer_zero_node to the proper type before calling fold_convert.
Bootstrapped and regression tested on x86_64. Installing on the trunk.
Jeff
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6edad21..7db5359 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2017-04-10 Jeff Law <l...@redhat.com>
+
+ PR tree-optimization/80374
+ * tree-ssa-dom.c (derive_equivalences_from_bit_ior): Do not try to
+ record anything if we can not convert integer_zero_node to the
+ desired type.
+
2017-04-10 Bin Cheng <bin.ch...@arm.com>
PR tree-optimization/80153
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index b87d0ee..6ed3c99 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-04-10 Jeff Law <l...@redhat.com>
+
+ PR tree-optimization/80374
+ * g++.dg/pr80374.c: New test.
+
2017-04-10 Daniel Santos <daniel.san...@pobox.com>
PR testsuite/79867
diff --git a/gcc/testsuite/g++.dg/pr80374.C b/gcc/testsuite/g++.dg/pr80374.C
new file mode 100644
index 0000000..b02b656
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr80374.C
@@ -0,0 +1,19 @@
+void a (const char *, const char *, int, const char *)
+ __attribute__ ((__noreturn__));
+template <typename b, int>
+void
+c () try
+ {
+ throw;
+ }
+catch (b d)
+ {
+ if (d)
+ a ("", "", 2, __PRETTY_FUNCTION__);
+ }
+main ()
+{
+ using e = decltype (nullptr);
+ c<volatile e, true> ();
+}
+
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c
index d2263bb..d9e5942 100644
--- a/gcc/tree-ssa-dom.c
+++ b/gcc/tree-ssa-dom.c
@@ -701,7 +701,8 @@ derive_equivalences_from_bit_ior (tree name,
const_and_copies *const_and_copies,
int recursion_limit)
{
- if (recursion_limit == 0)
+ if (recursion_limit == 0
+ || !fold_convertible_p (TREE_TYPE (name), integer_zero_node))
return;
if (TREE_CODE (name) == SSA_NAME)
