target/arm: Reject dup_i w/ shifted byte early

Remove the unparsed extraction in trans_DUP_i,
which is intended to reject an 8-bit shift of
an 8-bit constant for 8-bit element.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220527181907.189259-72-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target/arm/sve.decode b/target/arm/sve.decode
index 0388cce3bd9a6d4f88e69a210e6b42cb9fcd522b..c02da0a082982106a1f1d95fa0f1108f6894e508 100644 (file)
--- a/target/arm/sve.decode
+++ b/target/arm/sve.decode
@@ -787,7 +787,10 @@ WHILE_ptr       00100101 esz:2 1 rm:5 001 100 rn:5 rw:1 rd:4
 FDUP            00100101 esz:2 111 00 1110 imm:8 rd:5
 
 # SVE broadcast integer immediate (unpredicated)
-DUP_i           00100101 esz:2 111 00 011 . ........ rd:5       imm=%sh8_i8s
+{
+  INVALID       00100101 00    111 00 011 1 -------- -----
+  DUP_i         00100101 esz:2 111 00 011 . ........ rd:5       imm=%sh8_i8s
+}
 
 # SVE integer add/subtract immediate (unpredicated)
 ADD_zzi         00100101 .. 100 000 11 . ........ .....         @rdn_sh_i8u

diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index c0781ecf6012c0a14431ecad826c371a1821af22..14faef05641fea5e4f007fbe47a0ddc3b311d0f1 100644 (file)
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -403,6 +403,12 @@ const uint64_t pred_esz_masks[4] = {
     0x1111111111111111ull, 0x0101010101010101ull
 };
 
+static bool trans_INVALID(DisasContext *s, arg_INVALID *a)
+{
+    unallocated_encoding(s);
+    return true;
+}
+
 /*
  *** SVE Logical - Unpredicated Group
  */
@@ -3246,13 +3252,9 @@ static bool trans_FDUP(DisasContext *s, arg_FDUP *a)
 
 static bool trans_DUP_i(DisasContext *s, arg_DUP_i *a)
 {
-    if (a->esz == 0 && extract32(s->insn, 13, 1)) {
-        return false;
-    }
     if (sve_access_check(s)) {
         unsigned vsz = vec_full_reg_size(s);
         int dofs = vec_full_reg_offset(s, a->rd);
-
         tcg_gen_gvec_dup_imm(a->esz, dofs, vsz, vsz, a->imm);
     }
     return true;