[Qemu-devel] [PATCH 17/60] AArch64: Add dup GPR->Vec instruction emulation

[Alexander Graf]

This patch adds emulation for the DUP instruction flavor that copies
GPR contents into vector register parts.

Signed-off-by: Alexander Graf <address@hidden>
---
 target-arm/translate-a64.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index a864a90..ba19e10 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -833,6 +833,53 @@ static void handle_simdldstm(DisasContext *s, uint32_t 
insn, bool is_wback)
     tcg_temp_free_i64(tcg_addr);
 }
 
+static void handle_dupg(DisasContext *s, uint32_t insn)
+{
+    int rd = get_bits(insn, 0, 5);
+    int rn = get_bits(insn, 5, 5);
+    int imm5 = get_bits(insn, 16, 6);
+    int q = get_bits(insn, 30, 1);
+    int freg_offs_d = offsetof(CPUARMState, vfp.regs[rd * 2]);
+    int size;
+    int i;
+
+    for (size = 0; !(imm5 & (1 << size)); size++) {
+        if (size > 3) {
+            unallocated_encoding(s);
+            return;
+        }
+    }
+
+    if ((size == 3) && !q) {
+        /* XXX reserved value */
+        unallocated_encoding(s);
+    }
+
+    clear_fpreg(rd);
+    switch (size) {
+    case 0:
+        for (i = 0; i < (q ? 16 : 8); i++) {
+            tcg_gen_st8_i64(cpu_reg(rn), cpu_env, freg_offs_d + i);
+        }
+        break;
+    case 1:
+        for (i = 0; i < (q ? 16 : 8); i+=2) {
+            tcg_gen_st16_i64(cpu_reg(rn), cpu_env, freg_offs_d + i);
+        }
+        break;
+    case 2:
+        for (i = 0; i < (q ? 16 : 8); i+=4) {
+            tcg_gen_st32_i64(cpu_reg(rn), cpu_env, freg_offs_d + i);
+        }
+        break;
+    case 3:
+        for (i = 0; i < (q ? 16 : 8); i+=8) {
+            tcg_gen_st_i64(cpu_reg(rn), cpu_env, freg_offs_d + i);
+        }
+        break;
+    }
+}
+
 void disas_a64_insn(CPUARMState *env, DisasContext *s)
 {
     uint32_t insn;
@@ -891,6 +938,14 @@ void disas_a64_insn(CPUARMState *env, DisasContext *s)
             unallocated_encoding(s);
         }
         break;
+    case 0x0e:
+        if (!get_bits(insn, 31, 1) && !get_bits(insn, 29, 1) &&
+            (get_bits(insn, 10, 6) == 0x3)) {
+            handle_dupg(s, insn);
+        } else {
+            unallocated_encoding(s);
+        }
+        break;
     default:
         unallocated_encoding(s);
         break;
-- 
1.7.12.4