For gcc bug

gcc-bug-info/problematic_asm.txt

@@ -0,0 +1,39 @@
+000000000000005e <.L2820>:
+  5e:   6198                    ld      a4,0(a1)
+
+0000000000000060 <.LBB43490>:
+  60:   4590                    lw      a2,8(a1)
+
+0000000000000062 <.LBB43503>:
+  62:   0ff0000f                fence
+
+0000000000000066 <.LBB43492>:
+  66:   40eb07b3                sub     a5,s6,a4
+
+000000000000006a <.LBE43492>:
+  6a:   00c7d7b3                srl     a5,a5,a2
+
+000000000000006e <.LBB43493>:
+  6e:   2781                    sext.w  a5,a5
+
+0000000000000070 <.LBB43568>:
+  70:   16048063                beqz    s1,1d0 <.L1^B143>
+
+0000000000000074 <.LBB43572>:
+  74:   40e48733                sub     a4,s1,a4
+
+0000000000000078 <.LBE43586>:
+  78:   00c75733                srl     a4,a4,a2
+
+000000000000007c <.L1^B141>:
+  7c:   1009262f                lr.w    a2,(s2)
+  80:   00e61563                bne     a2,a4,8a <.L1^B142>
+  84:   18f9252f                sc.w    a0,a5,(s2)
+  88:   f975                    bnez    a0,7c <.L1^B141>
+
+000000000000008a <.L1^B142>:
+  8a:   0006079b                sext.w  a5,a2
+
+000000000000008e <.LVL4238>:
+  8e:   0ff0000f                fence
+

gcc-bug-info/problematic_method.ii

@@ -0,0 +1,20 @@
+template<size_t byte_size>
+template<typename T>
+inline T Atomic::PlatformCmpxchg<byte_size>::operator()(T volatile* dest __attribute__((unused)),
+                                                        T compare_value,
+                                                        T exchange_value,
+                                                        atomic_memory_order order) const {
+  static_assert((byte_size == sizeof(T)), "byte_size == sizeof(T)");
+  if (order != memory_order_relaxed) {
+    __sync_synchronize();
+  }
+
+  __atomic_compare_exchange(dest, &compare_value, &exchange_value, false,
+                            0, 0);
+
+  if (order != memory_order_relaxed) {
+    __sync_synchronize();
+  }
+  return compare_value;
+}
+