MicroBlaze: Fix volatile-register-var warning in READ_THREAD_POINTER

Resolves warning: 'optimization may eliminate reads and/or writes to
register variables'

2015-01-06  David Holsgrove <david.holsgrove@xilinx.com>

  * sysdeps/microblaze/nptl/tls.h: Remove inline
    __microblaze_get_thread_area and update READ_THREAD_POINTER.

Signed-off-by: David Holsgrove <david.holsgrove@xilinx.com>

diff --git a/ChangeLog b/ChangeLog
index 834e23c..2a925cd 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2015-01-09  David Holsgrove  <david.holsgrove@xilinx.com>
 
+       * sysdeps/microblaze/nptl/tls.h (__microblaze_get_thread_area): Function
+       removed.
+       (READ_THREAD_POINTER): Use __microblaze_thread_area instead.
+
+2015-01-09  David Holsgrove  <david.holsgrove@xilinx.com>
+
        * sysdeps/microblaze/nptl/tls.h (TLS_INIT_TP): Use NULL instead
        of 0.
 

diff --git a/sysdeps/microblaze/nptl/tls.h b/sysdeps/microblaze/nptl/tls.h
index fb4a71a..171a745 100644 (file)
--- a/sysdeps/microblaze/nptl/tls.h
+++ b/sysdeps/microblaze/nptl/tls.h
@@ -59,14 +59,9 @@ typedef struct
   void *private;
 } tcbhead_t;
 
-static inline void *__microblaze_get_thread_area (void)
-{
-  register void * volatile __microblaze_thread_area asm ("r21");
-  return (void *) __microblaze_thread_area;
-}
-
-# define READ_THREAD_POINTER() \
-  ({ __microblaze_get_thread_area(); })
+#define READ_THREAD_POINTER() \
+  ({ register void *__microblaze_thread_area asm ("r21"); \
+     __microblaze_thread_area; })
 
 /* This is the size of the initial TCB.  */
 # define TLS_INIT_TCB_SIZE  sizeof (tcbhead_t)