[PULL 075/117] target/arm: Reject add/sub w/ shifted byte early

[Peter Maydell <peter.maydell@linaro.org>]

From: Richard Henderson <richard.henderson@linaro.org>

Remove the unparsed extractions in trans_ADD_zzi, trans_SUBR_zzi,
and do_zzi_sat which are 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: 20220527181907.189259-73-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/sve.decode      | 35 ++++++++++++++++++++++++++++-------
 target/arm/translate-sve.c |  9 ---------
 2 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/target/arm/sve.decode b/target/arm/sve.decode
index c02da0a0829..8cff63cf257 100644
--- a/target/arm/sve.decode
+++ b/target/arm/sve.decode
@@ -793,13 +793,34 @@ FDUP            00100101 esz:2 111 00 1110 imm:8 rd:5
 }
 
 # SVE integer add/subtract immediate (unpredicated)
-ADD_zzi         00100101 .. 100 000 11 . ........ .....         @rdn_sh_i8u
-SUB_zzi         00100101 .. 100 001 11 . ........ .....         @rdn_sh_i8u
-SUBR_zzi        00100101 .. 100 011 11 . ........ .....         @rdn_sh_i8u
-SQADD_zzi       00100101 .. 100 100 11 . ........ .....         @rdn_sh_i8u
-UQADD_zzi       00100101 .. 100 101 11 . ........ .....         @rdn_sh_i8u
-SQSUB_zzi       00100101 .. 100 110 11 . ........ .....         @rdn_sh_i8u
-UQSUB_zzi       00100101 .. 100 111 11 . ........ .....         @rdn_sh_i8u
+{
+  INVALID       00100101 00 100 000 11 1 -------- -----
+  ADD_zzi       00100101 .. 100 000 11 . ........ .....         @rdn_sh_i8u
+}
+{
+  INVALID       00100101 00 100 001 11 1 -------- -----
+  SUB_zzi       00100101 .. 100 001 11 . ........ .....         @rdn_sh_i8u
+}
+{
+  INVALID       00100101 00 100 011 11 1 -------- -----
+  SUBR_zzi      00100101 .. 100 011 11 . ........ .....         @rdn_sh_i8u
+}
+{
+  INVALID       00100101 00 100 100 11 1 -------- -----
+  SQADD_zzi     00100101 .. 100 100 11 . ........ .....         @rdn_sh_i8u
+}
+{
+  INVALID       00100101 00 100 101 11 1 -------- -----
+  UQADD_zzi     00100101 .. 100 101 11 . ........ .....         @rdn_sh_i8u
+}
+{
+  INVALID       00100101 00 100 110 11 1 -------- -----
+  SQSUB_zzi     00100101 .. 100 110 11 . ........ .....         @rdn_sh_i8u
+}
+{
+  INVALID       00100101 00 100 111 11 1 -------- -----
+  UQSUB_zzi     00100101 .. 100 111 11 . ........ .....         @rdn_sh_i8u
+}
 
 # SVE integer min/max immediate (unpredicated)
 SMAX_zzi        00100101 .. 101 000 110 ........ .....          @rdn_i8s
diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index 14faef05641..bf988cab3eb 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -3262,9 +3262,6 @@ static bool trans_DUP_i(DisasContext *s, arg_DUP_i *a)
 
 static bool trans_ADD_zzi(DisasContext *s, arg_rri_esz *a)
 {
-    if (a->esz == 0 && extract32(s->insn, 13, 1)) {
-        return false;
-    }
     return gen_gvec_fn_arg_zzi(s, tcg_gen_gvec_addi, a);
 }
 
@@ -3305,9 +3302,6 @@ static bool trans_SUBR_zzi(DisasContext *s, arg_rri_esz *a)
           .scalar_first = true }
     };
 
-    if (a->esz == 0 && extract32(s->insn, 13, 1)) {
-        return false;
-    }
     if (sve_access_check(s)) {
         unsigned vsz = vec_full_reg_size(s);
         tcg_gen_gvec_2s(vec_full_reg_offset(s, a->rd),
@@ -3321,9 +3315,6 @@ TRANS_FEAT(MUL_zzi, aa64_sve, gen_gvec_fn_arg_zzi, tcg_gen_gvec_muli, a)
 
 static bool do_zzi_sat(DisasContext *s, arg_rri_esz *a, bool u, bool d)
 {
-    if (a->esz == 0 && extract32(s->insn, 13, 1)) {
-        return false;
-    }
     if (sve_access_check(s)) {
         do_sat_addsub_vec(s, a->esz, a->rd, a->rn,
                           tcg_constant_i64(a->imm), u, d);
-- 
2.25.1