target/arm: Convert vectorised 2-reg-misc Neon ops to decodetree

Convert to decodetree the insns in the Neon 2-reg-misc grouping which
we implement using gvec.

Backports commit 75153179e9928775d5333243ea4b278f438d75ae from qemu

qemu/target/arm/neon-dp.decode

@@ -447,9 +447,20 @@ Vimm_1r          1111 001 . 1 . 000 ... .... cmode:4 0 . op:1 1 .... @1reg_imm
     VPADDL_S     1111 001 11 . 11 .. 00 .... 0 0100 . . 0 .... @2misc
     VPADDL_U     1111 001 11 . 11 .. 00 .... 0 0101 . . 0 .... @2misc
 
+    VMVN         1111 001 11 . 11 .. 00 .... 0 1011 . . 0 .... @2misc
+
     VPADAL_S     1111 001 11 . 11 .. 00 .... 0 1100 . . 0 .... @2misc
     VPADAL_U     1111 001 11 . 11 .. 00 .... 0 1101 . . 0 .... @2misc
 
+    VCGT0        1111 001 11 . 11 .. 01 .... 0 0000 . . 0 .... @2misc
+    VCGE0        1111 001 11 . 11 .. 01 .... 0 0001 . . 0 .... @2misc
+    VCEQ0        1111 001 11 . 11 .. 01 .... 0 0010 . . 0 .... @2misc
+    VCLE0        1111 001 11 . 11 .. 01 .... 0 0011 . . 0 .... @2misc
+    VCLT0        1111 001 11 . 11 .. 01 .... 0 0100 . . 0 .... @2misc
+
+    VABS         1111 001 11 . 11 .. 01 .... 0 0110 . . 0 .... @2misc
+    VNEG         1111 001 11 . 11 .. 01 .... 0 0111 . . 0 .... @2misc
+
     VUZP         1111 001 11 . 11 .. 10 .... 0 0010 . . 0 .... @2misc
     VZIP         1111 001 11 . 11 .. 10 .... 0 0011 . . 0 .... @2misc
 

qemu/target/arm/translate-neon.inc.c

@@ -3494,3 +3494,59 @@ static bool trans_VCVT_F32_F16(DisasContext *s, arg_2misc *a)
 
     return true;
 }
+
+static bool do_2misc_vec(DisasContext *s, arg_2misc *a, GVecGen2Fn *fn)
+{
+    TCGContext *tcg_ctx = s->uc->tcg_ctx;
+    int vec_size = a->q ? 16 : 8;
+    int rd_ofs = neon_reg_offset(a->vd, 0);
+    int rm_ofs = neon_reg_offset(a->vm, 0);
+
+    if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
+        return false;
+    }
+
+    /* UNDEF accesses to D16-D31 if they don't exist. */
+    if (!dc_isar_feature(aa32_simd_r32, s) &&
+        ((a->vd | a->vm) & 0x10)) {
+        return false;
+    }
+
+    if (a->size == 3) {
+        return false;
+    }
+
+    if ((a->vd | a->vm) & a->q) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    fn(tcg_ctx, a->size, rd_ofs, rm_ofs, vec_size, vec_size);
+
+    return true;
+}
+
+#define DO_2MISC_VEC(INSN, FN)                                  \
+    static bool trans_##INSN(DisasContext *s, arg_2misc *a)     \
+    {                                                           \
+        return do_2misc_vec(s, a, FN);                          \
+    }
+
+DO_2MISC_VEC(VNEG, tcg_gen_gvec_neg)
+DO_2MISC_VEC(VABS, tcg_gen_gvec_abs)
+DO_2MISC_VEC(VCEQ0, gen_gvec_ceq0)
+DO_2MISC_VEC(VCGT0, gen_gvec_cgt0)
+DO_2MISC_VEC(VCLE0, gen_gvec_cle0)
+DO_2MISC_VEC(VCGE0, gen_gvec_cge0)
+DO_2MISC_VEC(VCLT0, gen_gvec_clt0)
+
+static bool trans_VMVN(DisasContext *s, arg_2misc *a)
+{
+    if (a->size != 0) {
+        return false;
+    }
+    return do_2misc_vec(s, a, tcg_gen_gvec_not);
+}

qemu/target/arm/translate.c

@@ -4964,7 +4964,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
     int size;
     int pass;
     int u;
-    int vec_size;
     TCGv_i32 tmp, tmp2;
 
     if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
@@ -4988,7 +4987,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
     VFP_DREG_D(rd, insn);
     VFP_DREG_M(rm, insn);
     size = (insn >> 20) & 3;
-    vec_size = q ? 16 : 8;
     rd_ofs = neon_reg_offset(rd, 0);
     rm_ofs = neon_reg_offset(rm, 0);
 
@@ -5034,6 +5032,14 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
                 case NEON_2RM_VSHLL:
                 case NEON_2RM_VCVT_F16_F32:
                 case NEON_2RM_VCVT_F32_F16:
+                case NEON_2RM_VMVN:
+                case NEON_2RM_VNEG:
+                case NEON_2RM_VABS:
+                case NEON_2RM_VCEQ0:
+                case NEON_2RM_VCGT0:
+                case NEON_2RM_VCLE0:
+                case NEON_2RM_VCGE0:
+                case NEON_2RM_VCLT0:
                     /* handled by decodetree */
                     return 1;
                 case NEON_2RM_VTRN:
@@ -5095,31 +5101,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
                                        q ? gen_helper_crypto_sha256su0
                                        : gen_helper_crypto_sha1su1);
                     break;
-                case NEON_2RM_VMVN:
-                    tcg_gen_gvec_not(tcg_ctx, 0, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
-                case NEON_2RM_VNEG:
-                    tcg_gen_gvec_neg(tcg_ctx, size, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
-                case NEON_2RM_VABS:
-                    tcg_gen_gvec_abs(tcg_ctx, size, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
-
-                case NEON_2RM_VCEQ0:
-                    gen_gvec_ceq0(tcg_ctx, size, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
-                case NEON_2RM_VCGT0:
-                    gen_gvec_cgt0(tcg_ctx, size, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
-                case NEON_2RM_VCLE0:
-                    gen_gvec_cle0(tcg_ctx, size, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
-                case NEON_2RM_VCGE0:
-                    gen_gvec_cge0(tcg_ctx, size, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
-                case NEON_2RM_VCLT0:
-                    gen_gvec_clt0(tcg_ctx, size, rd_ofs, rm_ofs, vec_size, vec_size);
-                    break;
 
                 default:
                 elementwise: