Index: libgcc/crtstuff.c
===================================================================
--- libgcc/crtstuff.c	(revision 241611)
+++ libgcc/crtstuff.c	(working copy)
@@ -273,41 +273,47 @@ STATIC func_ptr __TMC_LIST__[]
 # ifdef HAVE_GAS_HIDDEN
 extern func_ptr __TMC_END__[] __attribute__((__visibility__ ("hidden")));
 # endif
 
 static inline void
 deregister_tm_clones (void)
 {
   void (*fn) (void *);
 
 #ifdef HAVE_GAS_HIDDEN
-  if (__TMC_END__ - __TMC_LIST__ == 0)
+  func_ptr *end = __TMC_END__;
+  // Do not optimize the comparison to false.
+  __asm ("" : "+g" (end));
+  if (__TMC_LIST__ == end)
     return;
 #else
   if (__TMC_LIST__[0] == NULL)
     return;
 #endif
 
   fn = _ITM_deregisterTMCloneTable;
   __asm ("" : "+r" (fn));
   if (fn)
     fn (__TMC_LIST__);
 }
 
 static inline void
 register_tm_clones (void)
 {
   void (*fn) (void *, size_t);
   size_t size;
 
 #ifdef HAVE_GAS_HIDDEN
-  size = (__TMC_END__ - __TMC_LIST__) / 2;
+  func_ptr *end = __TMC_END__;
+  // Do not optimize the comparison to false.
+  __asm ("" : "+g" (end));
+  size = (end - __TMC_LIST__) / 2;
 #else
   for (size = 0; __TMC_LIST__[size * 2] != NULL; size++)
     continue;
 #endif
   if (size == 0)
     return;
 
   fn = _ITM_registerTMCloneTable;
   __asm ("" : "+r" (fn));
   if (fn)