[Qemu-devel] [PULL 44/48] target/arm: Convert integer-to-float insns to decodetree

[Peter Maydell]

Convert the VCVT integer-to-float instructions to decodetree.

Signed-off-by: Peter Maydell <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
---
 target/arm/translate-vfp.inc.c | 58 ++++++++++++++++++++++++++++++++++
 target/arm/translate.c         | 12 +------
 target/arm/vfp.decode          |  6 ++++
 3 files changed, 65 insertions(+), 11 deletions(-)

diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
index c50093776b6..cc3f61d9c41 100644
--- a/target/arm/translate-vfp.inc.c
+++ b/target/arm/translate-vfp.inc.c
@@ -2368,3 +2368,61 @@ static bool trans_VCVT_dp(DisasContext *s, arg_VCVT_dp 
*a)
     tcg_temp_free_i64(vm);
     return true;
 }
+
+static bool trans_VCVT_int_sp(DisasContext *s, arg_VCVT_int_sp *a)
+{
+    TCGv_i32 vm;
+    TCGv_ptr fpst;
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    vm = tcg_temp_new_i32();
+    neon_load_reg32(vm, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    if (a->s) {
+        /* i32 -> f32 */
+        gen_helper_vfp_sitos(vm, vm, fpst);
+    } else {
+        /* u32 -> f32 */
+        gen_helper_vfp_uitos(vm, vm, fpst);
+    }
+    neon_store_reg32(vm, a->vd);
+    tcg_temp_free_i32(vm);
+    tcg_temp_free_ptr(fpst);
+    return true;
+}
+
+static bool trans_VCVT_int_dp(DisasContext *s, arg_VCVT_int_dp *a)
+{
+    TCGv_i32 vm;
+    TCGv_i64 vd;
+    TCGv_ptr fpst;
+
+    /* UNDEF accesses to D16-D31 if they don't exist. */
+    if (!dc_isar_feature(aa32_fp_d32, s) && (a->vd & 0x10)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    vm = tcg_temp_new_i32();
+    vd = tcg_temp_new_i64();
+    neon_load_reg32(vm, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    if (a->s) {
+        /* i32 -> f64 */
+        gen_helper_vfp_sitod(vd, vm, fpst);
+    } else {
+        /* u32 -> f64 */
+        gen_helper_vfp_uitod(vd, vm, fpst);
+    }
+    neon_store_reg64(vd, a->vd);
+    tcg_temp_free_i32(vm);
+    tcg_temp_free_i64(vd);
+    tcg_temp_free_ptr(fpst);
+    return true;
+}
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 40e52c3b700..da4d4e9d012 100644
--- 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 ... 15:
+                case 0 ... 17:
                     /* Already handled by decodetree */
                     return 1;
                 default:
@@ -3063,10 +3063,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
             if (op == 15) {
                 /* rn is opcode, encoded as per VFP_SREG_N. */
                 switch (rn) {
-                case 0x10: /* vcvt.fxx.u32 */
-                case 0x11: /* vcvt.fxx.s32 */
-                    rm_is_dp = false;
-                    break;
                 case 0x18: /* vcvtr.u32.fxx */
                 case 0x19: /* vcvtz.u32.fxx */
                 case 0x1a: /* vcvtr.s32.fxx */
@@ -3181,12 +3177,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
                 switch (op) {
                 case 15: /* extension space */
                     switch (rn) {
-                    case 16: /* fuito */
-                        gen_vfp_uito(dp, 0);
-                        break;
-                    case 17: /* fsito */
-                        gen_vfp_sito(dp, 0);
-                        break;
                     case 19: /* vjcvt */
                         gen_helper_vjcvt(cpu_F0s, cpu_F0d, cpu_env);
                         break;
diff --git a/target/arm/vfp.decode b/target/arm/vfp.decode
index 56b8b4e6046..6da9a7913da 100644
--- a/target/arm/vfp.decode
+++ b/target/arm/vfp.decode
@@ -214,3 +214,9 @@ VCVT_sp      ---- 1110 1.11 0111 .... 1010 11.0 .... \
              vd=%vd_dp vm=%vm_sp
 VCVT_dp      ---- 1110 1.11 0111 .... 1011 11.0 .... \
              vd=%vd_sp vm=%vm_dp
+
+# VCVT from integer to floating point: Vm always single; Vd depends on size
+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
-- 
2.20.1