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-rw-r--r--target-arm/translate-a64.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index d3801c5282..94b3bf40f6 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -2820,7 +2820,10 @@ static bool logic_imm_decode_wmask(uint64_t *result, unsigned int immn,
      * by r within the element (which is e bits wide)...
      */
     mask = bitmask64(s + 1);
-    mask = (mask >> r) | (mask << (e - r));
+    if (r) {
+        mask = (mask >> r) | (mask << (e - r));
+        mask &= bitmask64(e);
+    }
     /* ...then replicate the element over the whole 64 bit value */
     mask = bitfield_replicate(mask, e);
     *result = mask;