target/arm: Decode aa64 armv8.3 fcadd

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180228193125.20577-12-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 47 insertions, 1 deletions

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index e4d2d54..efed4fd 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -713,6 +713,21 @@ static void gen_gvec_op3_env(DisasContext *s, bool is_q, int rd,
                        is_q ? 16 : 8, vec_full_reg_size(s), 0, fn);
 }
 
+/* Expand a 3-operand + fpstatus pointer + simd data value operation using
+ * an out-of-line helper.
+ */
+static void gen_gvec_op3_fpst(DisasContext *s, bool is_q, int rd, int rn,
+                              int rm, bool is_fp16, int data,
+                              gen_helper_gvec_3_ptr *fn)
+{
+    TCGv_ptr fpst = get_fpstatus_ptr(is_fp16);
+    tcg_gen_gvec_3_ptr(vec_full_reg_offset(s, rd),
+                       vec_full_reg_offset(s, rn),
+                       vec_full_reg_offset(s, rm), fpst,
+                       is_q ? 16 : 8, vec_full_reg_size(s), data, fn);
+    tcg_temp_free_ptr(fpst);
+}
+
 /* Set ZF and NF based on a 64 bit result. This is alas fiddlier
  * than the 32 bit equivalent.
  */
@@ -10816,7 +10831,7 @@ static void disas_simd_three_reg_same_extra(DisasContext *s, uint32_t insn)
     int size = extract32(insn, 22, 2);
     bool u = extract32(insn, 29, 1);
     bool is_q = extract32(insn, 30, 1);
-    int feature;
+    int feature, rot;
 
     switch (u * 16 + opcode) {
     case 0x10: /* SQRDMLAH (vector) */
@@ -10827,6 +10842,16 @@ static void disas_simd_three_reg_same_extra(DisasContext *s, uint32_t insn)
         }
         feature = ARM_FEATURE_V8_RDM;
         break;
+    case 0xc: /* FCADD, #90 */
+    case 0xe: /* FCADD, #270 */
+        if (size == 0
+            || (size == 1 && !arm_dc_feature(s, ARM_FEATURE_V8_FP16))
+            || (size == 3 && !is_q)) {
+            unallocated_encoding(s);
+            return;
+        }
+        feature = ARM_FEATURE_V8_FCMA;
+        break;
     default:
         unallocated_encoding(s);
         return;
@@ -10866,6 +10891,27 @@ static void disas_simd_three_reg_same_extra(DisasContext *s, uint32_t insn)
         }
         return;
 
+    case 0xc: /* FCADD, #90 */
+    case 0xe: /* FCADD, #270 */
+        rot = extract32(opcode, 1, 1);
+        switch (size) {
+        case 1:
+            gen_gvec_op3_fpst(s, is_q, rd, rn, rm, size == 1, rot,
+                              gen_helper_gvec_fcaddh);
+            break;
+        case 2:
+            gen_gvec_op3_fpst(s, is_q, rd, rn, rm, size == 1, rot,
+                              gen_helper_gvec_fcadds);
+            break;
+        case 3:
+            gen_gvec_op3_fpst(s, is_q, rd, rn, rm, size == 1, rot,
+                              gen_helper_gvec_fcaddd);
+            break;
+        default:
+            g_assert_not_reached();
+        }
+        return;
+
     default:
         g_assert_not_reached();
     }