[Qemu-devel] [PULL 27/48] target/arm: Convert VFP VNMLA to decodetree

[Peter Maydell <peter.maydell@linaro.org>]

Convert the VFP VNMLA instruction to decodetree.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/translate-vfp.inc.c | 34 ++++++++++++++++++++++++++++++++++
 target/arm/translate.c         | 19 +------------------
 target/arm/vfp.decode          |  5 +++++
 3 files changed, 40 insertions(+), 18 deletions(-)

diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
index 1d7100debe4..8532bf4abcd 100644
--- a/target/arm/translate-vfp.inc.c
+++ b/target/arm/translate-vfp.inc.c
@@ -1383,3 +1383,37 @@ static bool trans_VNMLS_dp(DisasContext *s, arg_VNMLS_sp *a)
 {
     return do_vfp_3op_dp(s, gen_VNMLS_dp, a->vd, a->vn, a->vm, true);
 }
+
+static void gen_VNMLA_sp(TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm, TCGv_ptr fpst)
+{
+    /* VNMLA: -fd + -(fn * fm) */
+    TCGv_i32 tmp = tcg_temp_new_i32();
+
+    gen_helper_vfp_muls(tmp, vn, vm, fpst);
+    gen_helper_vfp_negs(tmp, tmp);
+    gen_helper_vfp_negs(vd, vd);
+    gen_helper_vfp_adds(vd, vd, tmp, fpst);
+    tcg_temp_free_i32(tmp);
+}
+
+static bool trans_VNMLA_sp(DisasContext *s, arg_VNMLA_sp *a)
+{
+    return do_vfp_3op_sp(s, gen_VNMLA_sp, a->vd, a->vn, a->vm, true);
+}
+
+static void gen_VNMLA_dp(TCGv_i64 vd, TCGv_i64 vn, TCGv_i64 vm, TCGv_ptr fpst)
+{
+    /* VNMLA: -fd + (fn * fm) */
+    TCGv_i64 tmp = tcg_temp_new_i64();
+
+    gen_helper_vfp_muld(tmp, vn, vm, fpst);
+    gen_helper_vfp_negd(tmp, tmp);
+    gen_helper_vfp_negd(vd, vd);
+    gen_helper_vfp_addd(vd, vd, tmp, fpst);
+    tcg_temp_free_i64(tmp);
+}
+
+static bool trans_VNMLA_dp(DisasContext *s, arg_VNMLA_sp *a)
+{
+    return do_vfp_3op_dp(s, gen_VNMLA_dp, a->vd, a->vn, a->vm, true);
+}
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 42701884101..0b998552df2 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -1393,16 +1393,6 @@ VFP_OP2(div)
 
 #undef VFP_OP2
 
-static inline void gen_vfp_F1_neg(int dp)
-{
-    /* Like gen_vfp_neg() but put result in F1 */
-    if (dp) {
-        gen_helper_vfp_negd(cpu_F1d, cpu_F0d);
-    } else {
-        gen_helper_vfp_negs(cpu_F1s, cpu_F0s);
-    }
-}
-
 static inline void gen_vfp_abs(int dp)
 {
     if (dp)
@@ -3122,7 +3112,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
             rn = VFP_SREG_N(insn);
 
             switch (op) {
-            case 0 ... 2:
+            case 0 ... 3:
                 /* Already handled by decodetree */
                 return 1;
             default:
@@ -3308,13 +3298,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
             for (;;) {
                 /* Perform the calculation.  */
                 switch (op) {
-                case 3: /* VNMLA: -fd + -(fn * fm) */
-                    gen_vfp_mul(dp);
-                    gen_vfp_F1_neg(dp);
-                    gen_mov_F0_vreg(dp, rd);
-                    gen_vfp_neg(dp);
-                    gen_vfp_add(dp);
-                    break;
                 case 4: /* mul: fn * fm */
                     gen_vfp_mul(dp);
                     break;
diff --git a/target/arm/vfp.decode b/target/arm/vfp.decode
index 08e4f427408..c50d2c3ebf3 100644
--- a/target/arm/vfp.decode
+++ b/target/arm/vfp.decode
@@ -112,3 +112,8 @@ VNMLS_sp     ---- 1110 0.01 .... .... 1010 .0.0 .... \
              vm=%vm_sp vn=%vn_sp vd=%vd_sp
 VNMLS_dp     ---- 1110 0.01 .... .... 1011 .0.0 .... \
              vm=%vm_dp vn=%vn_dp vd=%vd_dp
+
+VNMLA_sp     ---- 1110 0.01 .... .... 1010 .1.0 .... \
+             vm=%vm_sp vn=%vn_sp vd=%vd_sp
+VNMLA_dp     ---- 1110 0.01 .... .... 1011 .1.0 .... \
+             vm=%vm_dp vn=%vn_dp vd=%vd_dp
-- 
2.20.1