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From: Peter Maydell <peter.maydell@linaro.org>
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Subject: [Qemu-devel] [PULL 37/39] target/arm: Decode aa32 armv8.3
2-reg-index
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From: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180228193125.20577-15-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target/arm/translate.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++=
++++
1 file changed, 61 insertions(+)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 45513c9d86..3ad8b4031c 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -7742,6 +7742,61 @@ static int disas_neon_insn_3same_ext(DisasContext *s=
, uint32_t insn)
return 0;
}
=20
+/* Advanced SIMD two registers and a scalar extension.
+ * 31 24 23 22 20 16 12 11 10 9 8 3 =
0
+ * +-----------------+----+---+----+----+----+---+----+---+----+---------+=
----+
+ * | 1 1 1 1 1 1 1 0 | o1 | D | o2 | Vn | Vd | 1 | o3 | 0 | o4 | N Q M U |=
Vm |
+ * +-----------------+----+---+----+----+----+---+----+---+----+---------+=
----+
+ *
+ */
+
+static int disas_neon_insn_2reg_scalar_ext(DisasContext *s, uint32_t insn)
+{
+ int rd, rn, rm, rot, size, opr_sz;
+ TCGv_ptr fpst;
+ bool q;
+
+ q =3D extract32(insn, 6, 1);
+ VFP_DREG_D(rd, insn);
+ VFP_DREG_N(rn, insn);
+ VFP_DREG_M(rm, insn);
+ if ((rd | rn) & q) {
+ return 1;
+ }
+
+ if ((insn & 0xff000f10) =3D=3D 0xfe000800) {
+ /* VCMLA (indexed) -- 1111 1110 S.RR .... .... 1000 ...0 .... */
+ rot =3D extract32(insn, 20, 2);
+ size =3D extract32(insn, 23, 1);
+ if (!arm_dc_feature(s, ARM_FEATURE_V8_FCMA)
+ || (!size && !arm_dc_feature(s, ARM_FEATURE_V8_FP16))) {
+ return 1;
+ }
+ } else {
+ return 1;
+ }
+
+ if (s->fp_excp_el) {
+ gen_exception_insn(s, 4, EXCP_UDEF,
+ syn_fp_access_trap(1, 0xe, false), s->fp_excp_e=
l);
+ return 0;
+ }
+ if (!s->vfp_enabled) {
+ return 1;
+ }
+
+ opr_sz =3D (1 + q) * 8;
+ fpst =3D get_fpstatus_ptr(1);
+ tcg_gen_gvec_3_ptr(vfp_reg_offset(1, rd),
+ vfp_reg_offset(1, rn),
+ vfp_reg_offset(1, rm), fpst,
+ opr_sz, opr_sz, rot,
+ size ? gen_helper_gvec_fcmlas_idx
+ : gen_helper_gvec_fcmlah_idx);
+ tcg_temp_free_ptr(fpst);
+ return 0;
+}
+
static int disas_coproc_insn(DisasContext *s, uint32_t insn)
{
int cpnum, is64, crn, crm, opc1, opc2, isread, rt, rt2;
@@ -8492,6 +8547,12 @@ static void disas_arm_insn(DisasContext *s, unsigned=
int insn)
goto illegal_op;
}
return;
+ } else if ((insn & 0x0f000a00) =3D=3D 0x0e000800
+ && arm_dc_feature(s, ARM_FEATURE_V8)) {
+ if (disas_neon_insn_2reg_scalar_ext(s, insn)) {
+ goto illegal_op;
+ }
+ return;
} else if ((insn & 0x0fe00000) =3D=3D 0x0c400000) {
/* Coprocessor double register transfer. */
ARCH(5TE);
--=20
2.16.2