[Patch 4/4] ARM 64 bit sync atomic operations [V2]

[Dr. David Alan Gilbert]

        gcc/
        * config/arm/arm.c (TARGET_HAVE_DMB_MCR) MCR Not available in Thumb1
          but is available on armv6

diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 0d419d5..146b9ad 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -285,7 +285,8 @@ extern void (*arm_lang_output_object_attributes_hook)(void);
 #define TARGET_HAVE_DMB                (arm_arch7)
 
 /* Nonzero if this chip implements a memory barrier via CP15.  */
-#define TARGET_HAVE_DMB_MCR    (arm_arch6k && ! TARGET_HAVE_DMB)
+#define TARGET_HAVE_DMB_MCR    (arm_arch6 && ! TARGET_HAVE_DMB \
+                                && ! TARGET_THUMB1)
 
 /* Nonzero if this chip implements a memory barrier instruction.  */
 #define TARGET_HAVE_MEMORY_BARRIER (TARGET_HAVE_DMB || TARGET_HAVE_DMB_MCR)