target/arm: Implement FDUP/DUP

Backports commit ed49196125360c037d7f23c1c315a85cc234e72d from qemu

qemu/target/arm/sve.decode

@@ -614,6 +614,14 @@ CTERM           00100101 1 sf:1 1 rm:5 001000 rn:5 ne:1 0000
 # SVE integer compare scalar count and limit
 WHILE           00100101 esz:2 1 rm:5 000 sf:1 u:1 1 rn:5 eq:1 rd:4
 
+### SVE Integer Wide Immediate - Unpredicated Group
+
+# SVE broadcast floating-point immediate (unpredicated)
+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
+
 ### SVE Memory - 32-bit Gather and Unsized Contiguous Group
 
 # SVE load predicate register

qemu/target/arm/translate-sve.c

@@ -3306,6 +3306,45 @@ static bool trans_WHILE(DisasContext *s, arg_WHILE *a, uint32_t insn)
     return true;
 }
 
+/*
+ *** SVE Integer Wide Immediate - Unpredicated Group
+ */
+
+static bool trans_FDUP(DisasContext *s, arg_FDUP *a, uint32_t insn)
+{
+    if (a->esz == 0) {
+        return false;
+    }
+    if (sve_access_check(s)) {
+        TCGContext *tcg_ctx = s->uc->tcg_ctx;
+        unsigned vsz = vec_full_reg_size(s);
+        int dofs = vec_full_reg_offset(s, a->rd);
+        uint64_t imm;
+
+        /* Decode the VFP immediate.  */
+        imm = vfp_expand_imm(a->esz, a->imm);
+        imm = dup_const(a->esz, imm);
+
+        tcg_gen_gvec_dup64i(tcg_ctx, dofs, vsz, vsz, imm);
+    }
+    return true;
+}
+
+static bool trans_DUP_i(DisasContext *s, arg_DUP_i *a, uint32_t insn)
+{
+    if (a->esz == 0 && extract32(insn, 13, 1)) {
+        return false;
+    }
+    if (sve_access_check(s)) {
+        TCGContext *tcg_ctx = s->uc->tcg_ctx;
+        unsigned vsz = vec_full_reg_size(s);
+        int dofs = vec_full_reg_offset(s, a->rd);
+
+        tcg_gen_gvec_dup64i(tcg_ctx, dofs, vsz, vsz, dup_const(a->esz, a->imm));
+    }
+    return true;
+}
+
 /*
  *** SVE Memory - 32-bit Gather and Unsized Contiguous Group
  */