target/arm: Convert BFCVT to decodetree

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241211163036.2297116-30-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index 9d2f099c9cacf2b8d6ec9208c13dec227e951502..4a48fcff1dca061956e4f5d0f32e3a8f031bf1c4 100644 (file)
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -45,6 +45,7 @@
 &qrrrr_e        q rd rn rm ra esz
 
 @rr_h           ........ ... ..... ...... rn:5 rd:5     &rr_e esz=1
+@rr_s           ........ ... ..... ...... rn:5 rd:5     &rr_e esz=2
 @rr_d           ........ ... ..... ...... rn:5 rd:5     &rr_e esz=3
 @rr_sd          ........ ... ..... ...... rn:5 rd:5     &rr_e esz=%esz_sd
 @rr_hsd         ........ ... ..... ...... rn:5 rd:5     &rr_e esz=%esz_hsd
@@ -1337,6 +1338,8 @@ FRINTA_s        00011110 .. 1 001100 10000 ..... .....      @rr_hsd
 FRINTX_s        00011110 .. 1 001110 10000 ..... .....      @rr_hsd
 FRINTI_s        00011110 .. 1 001111 10000 ..... .....      @rr_hsd
 
+BFCVT_s         00011110 01 1 000110 10000 ..... .....      @rr_s
+
 # Floating-point Immediate
 
 FMOVI_s         0001 1110 .. 1 imm:8 100 00000 rd:5         esz=%esz_hsd

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 5a347bece37c0a484833fd0ef8f14dfa4605f380..5b30b4cacac3bb64081368f45a26d9e0c0f9fc93 100644 (file)
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -8420,6 +8420,11 @@ static const FPScalar1 f_scalar_frintx = {
 };
 TRANS(FRINTX_s, do_fp1_scalar, a, &f_scalar_frintx, -1)
 
+static const FPScalar1 f_scalar_bfcvt = {
+    .gen_s = gen_helper_bfcvt,
+};
+TRANS_FEAT(BFCVT_s, aa64_bf16, do_fp1_scalar, a, &f_scalar_bfcvt, -1)
+
 /* Floating-point data-processing (1 source) - single precision */
 static void handle_fp_1src_single(DisasContext *s, int opcode, int rd, int rn)
 {
@@ -8432,9 +8437,6 @@ static void handle_fp_1src_single(DisasContext *s, int opcode, int rd, int rn)
     tcg_res = tcg_temp_new_i32();
 
     switch (opcode) {
-    case 0x6: /* BFCVT */
-        gen_fpst = gen_helper_bfcvt;
-        break;
     case 0x10: /* FRINT32Z */
         rmode = FPROUNDING_ZERO;
         gen_fpst = gen_helper_frint32_s;
@@ -8454,6 +8456,7 @@ static void handle_fp_1src_single(DisasContext *s, int opcode, int rd, int rn)
     case 0x1: /* FABS */
     case 0x2: /* FNEG */
     case 0x3: /* FSQRT */
+    case 0x6: /* BFCVT */
     case 0x8: /* FRINTN */
     case 0x9: /* FRINTP */
     case 0xa: /* FRINTM */
@@ -8652,28 +8655,13 @@ static void disas_fp_1src(DisasContext *s, uint32_t insn)
         }
         break;
 
-    case 0x6:
-        switch (type) {
-        case 1: /* BFCVT */
-            if (!dc_isar_feature(aa64_bf16, s)) {
-                goto do_unallocated;
-            }
-            if (!fp_access_check(s)) {
-                return;
-            }
-            handle_fp_1src_single(s, opcode, rd, rn);
-            break;
-        default:
-            goto do_unallocated;
-        }
-        break;
-
     default:
     do_unallocated:
     case 0x0: /* FMOV */
     case 0x1: /* FABS */
     case 0x2: /* FNEG */
     case 0x3: /* FSQRT */
+    case 0x6: /* BFCVT */
     case 0x8: /* FRINTN */
     case 0x9: /* FRINTP */
     case 0xa: /* FRINTM */