--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/torture/pr92152.C	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,74 @@
+/* { dg-do run } */
+using size_t = decltype (sizeof (0));
+using uint64_t = unsigned long long;
+
+namespace HPHP {
+
+inline void bitvec_set(uint64_t* bits, size_t index) {
+  bits[index / 64] |= 1ull << (index % 64);
+}
+
+namespace jit {
+///////////////////////////////////////////////////////////////////////////////
+
+struct VregSet {
+  struct Block;
+
+  VregSet() : blocks{} { blocks.data[1] = 1LL << 0x30; };
+
+  VregSet(const VregSet& o)
+    : blocks{o.blocks}
+  {
+  }
+
+  bool any() const {
+    if (!isExtended()) return blocks.any();
+    return true;
+  }
+  void removePhys() {
+    auto const b = !isExtended() ? &blocks : extended.blocks;
+    b->data[0] = 0;
+    b->data[1] = 0;
+  }
+  static constexpr size_t kBitsPerBlock = 256;
+  bool isExtended() const {
+    return extended.data[1] & (1ULL << (kExtendedBit % 64));
+  }
+
+  static constexpr size_t kExtendedBit = 127;
+
+  struct Block {
+    bool any() const {
+      return data[0] | data[1];
+    }
+    uint64_t data[2];
+  };
+  struct Extended {
+    uint64_t data[2];
+    Block* blocks;
+  };
+
+  union {
+    Block blocks{};
+    Extended extended;
+  };
+};
+
+//////////////////////////////////////////////////////////////////////
+
+
+__attribute__((noinline))
+bool test(VregSet&& c) {
+  auto copy = c;
+  copy.removePhys();
+  return copy.any();
+}
+///////////////////////////////////////////////////////////////////////////////
+}}
+///////////////////////////////////////////////////////////////////////////////
+
+int main() {
+  if (HPHP::jit::test(HPHP::jit::VregSet{}))
+    __builtin_abort ();
+  return 0;
+}