target/arm: Convert VJCVT to decodetree

Convert the VJCVT instruction to decodetree. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
qemu · Jun 13, 2019 · 92073e9 · 92073e9
1 parent 8fc9d89
commit 92073e9
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Showing 3 changed files with 33 additions and 11 deletions.
diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
@@ -2426,3 +2426,31 @@ static bool trans_VCVT_int_dp(DisasContext *s, arg_VCVT_int_dp *a)
     tcg_temp_free_ptr(fpst);
     return true;
 }
+
+static bool trans_VJCVT(DisasContext *s, arg_VJCVT *a)
+{
+    TCGv_i32 vd;
+    TCGv_i64 vm;
+
+    if (!dc_isar_feature(aa32_jscvt, s)) {
+        return false;
+    }
+
+    /* UNDEF accesses to D16-D31 if they don't exist. */
+    if (!dc_isar_feature(aa32_fp_d32, s) && (a->vm & 0x10)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    vm = tcg_temp_new_i64();
+    vd = tcg_temp_new_i32();
+    neon_load_reg64(vm, a->vm);
+    gen_helper_vjcvt(vd, vm, cpu_env);
+    neon_store_reg32(vd, a->vd);
+    tcg_temp_free_i64(vm);
+    tcg_temp_free_i32(vd);
+    return true;
+}
diff --git a/target/arm/translate.c b/target/arm/translate.c
@@ -3050,7 +3050,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
                 return 1;
             case 15:
                 switch (rn) {
-                case 0 ... 17:
+                case 0 ... 19:
                     /* Already handled by decodetree */
                     return 1;
                 default:
@@ -3085,13 +3085,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
                     rm_is_dp = false;
                     break;
 
-                case 0x13: /* vjcvt */
-                    if (!dp || !dc_isar_feature(aa32_jscvt, s)) {
-                        return 1;
-                    }
-                    rd_is_dp = false;
-                    break;
-
                 default:
                     return 1;
                 }
@@ -3177,9 +3170,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
                 switch (op) {
                 case 15: /* extension space */
                     switch (rn) {
-                    case 19: /* vjcvt */
-                        gen_helper_vjcvt(cpu_F0s, cpu_F0d, cpu_env);
-                        break;
                     case 20: /* fshto */
                         gen_vfp_shto(dp, 16 - rm, 0);
                         break;

diff --git a/target/arm/vfp.decode b/target/arm/vfp.decode
@@ -220,3 +220,7 @@ VCVT_int_sp  ---- 1110 1.11 1000 .... 1010 s:1 1.0 .... \
              vd=%vd_sp vm=%vm_sp
 VCVT_int_dp  ---- 1110 1.11 1000 .... 1011 s:1 1.0 .... \
              vd=%vd_dp vm=%vm_sp
+
+# VJCVT is always dp to sp
+VJCVT        ---- 1110 1.11 1001 .... 1011 11.0 .... \
+             vd=%vd_sp vm=%vm_dp