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-rw-r--r--gcc/config/arm/arm.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 151d3141381..292b48f96de 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -294,7 +294,8 @@ 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)