target/arm: Tidy conditions in handle_vec_simd_shri

The (size > 3 && !is_q) condition is identical to the preceeding test
of bit 3 in immh; eliminate it.  For the benefit of Coverity, assert
that size is within the bounds we expect.

Fixes: Coverity CID1385846
Fixes: Coverity CID1385849
Fixes: Coverity CID1385852
Fixes: Coverity CID1385857
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20180501180455.11214-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 1 insertions, 5 deletions

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index bff4e13bf6..97950dce1a 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -9019,11 +9019,7 @@ static void handle_vec_simd_shri(DisasContext *s, bool is_q, bool is_u,
         unallocated_encoding(s);
         return;
     }
-
-    if (size > 3 && !is_q) {
-        unallocated_encoding(s);
-        return;
-    }
+    tcg_debug_assert(size <= 3);
 
     if (!fp_access_check(s)) {
         return;