arm/translate-a64: add all FP16 ops in simd_scalar_pairwise

I only needed to do a little light re-factoring to support the
half-precision helpers.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180227143852.11175-30-alex.bennee@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/translate-a64.c

@@ -6416,24 +6416,30 @@ static void disas_simd_scalar_pairwise(DisasContext *s, uint32_t insn)
     case 0xf: /* FMAXP */
     case 0x2c: /* FMINNMP */
     case 0x2f: /* FMINP */
-        /* FP op, size[0] is 32 or 64 bit */
+        /* FP op, size[0] is 32 or 64 bit*/
         if (!u) {
-            unallocated_encoding(s);
-            return;
+            if (!arm_dc_feature(s, ARM_FEATURE_V8_FP16)) {
+                unallocated_encoding(s);
+                return;
+            } else {
+                size = MO_16;
+            }
+        } else {
+            size = extract32(size, 0, 1) ? MO_64 : MO_32;
         }
+
         if (!fp_access_check(s)) {
             return;
         }
 
-        size = extract32(size, 0, 1) ? 3 : 2;
-        fpst = get_fpstatus_ptr(false);
+        fpst = get_fpstatus_ptr(size == MO_16);
         break;
     default:
         unallocated_encoding(s);
         return;
     }
 
-    if (size == 3) {
+    if (size == MO_64) {
         TCGv_i64 tcg_op1 = tcg_temp_new_i64();
         TCGv_i64 tcg_op2 = tcg_temp_new_i64();
         TCGv_i64 tcg_res = tcg_temp_new_i64();
@@ -6474,27 +6480,49 @@ static void disas_simd_scalar_pairwise(DisasContext *s, uint32_t insn)
         TCGv_i32 tcg_op2 = tcg_temp_new_i32();
         TCGv_i32 tcg_res = tcg_temp_new_i32();
 
-        read_vec_element_i32(s, tcg_op1, rn, 0, MO_32);
-        read_vec_element_i32(s, tcg_op2, rn, 1, MO_32);
+        read_vec_element_i32(s, tcg_op1, rn, 0, size);
+        read_vec_element_i32(s, tcg_op2, rn, 1, size);
 
-        switch (opcode) {
-        case 0xc: /* FMAXNMP */
-            gen_helper_vfp_maxnums(tcg_res, tcg_op1, tcg_op2, fpst);
-            break;
-        case 0xd: /* FADDP */
-            gen_helper_vfp_adds(tcg_res, tcg_op1, tcg_op2, fpst);
-            break;
-        case 0xf: /* FMAXP */
-            gen_helper_vfp_maxs(tcg_res, tcg_op1, tcg_op2, fpst);
-            break;
-        case 0x2c: /* FMINNMP */
-            gen_helper_vfp_minnums(tcg_res, tcg_op1, tcg_op2, fpst);
-            break;
-        case 0x2f: /* FMINP */
-            gen_helper_vfp_mins(tcg_res, tcg_op1, tcg_op2, fpst);
-            break;
-        default:
-            g_assert_not_reached();
+        if (size == MO_16) {
+            switch (opcode) {
+            case 0xc: /* FMAXNMP */
+                gen_helper_advsimd_maxnumh(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0xd: /* FADDP */
+                gen_helper_advsimd_addh(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0xf: /* FMAXP */
+                gen_helper_advsimd_maxh(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0x2c: /* FMINNMP */
+                gen_helper_advsimd_minnumh(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0x2f: /* FMINP */
+                gen_helper_advsimd_minh(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            default:
+                g_assert_not_reached();
+            }
+        } else {
+            switch (opcode) {
+            case 0xc: /* FMAXNMP */
+                gen_helper_vfp_maxnums(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0xd: /* FADDP */
+                gen_helper_vfp_adds(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0xf: /* FMAXP */
+                gen_helper_vfp_maxs(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0x2c: /* FMINNMP */
+                gen_helper_vfp_minnums(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            case 0x2f: /* FMINP */
+                gen_helper_vfp_mins(tcg_res, tcg_op1, tcg_op2, fpst);
+                break;
+            default:
+                g_assert_not_reached();
+            }
         }
 
         write_fp_sreg(s, rd, tcg_res);