target/arm: Convert FMOVI (scalar, immediate) to decodetree

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240912024114.1097832-13-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 30 insertions, 48 deletions

diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index c77f9fc..e11e293 100644
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -1180,3 +1180,7 @@ FMAXV_s         0110 1110 00 11000 01111 10 ..... .....     @rr_q1e2
 
 FMINV_h         0.00 1110 10 11000 01111 10 ..... .....     @qrr_h
 FMINV_s         0110 1110 10 11000 01111 10 ..... .....     @rr_q1e2
+
+# 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 aec2f6a..0e29006 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -6888,6 +6888,31 @@ TRANS(FMINNMV_s, do_fp_reduction, a, gen_helper_vfp_minnums)
 TRANS(FMAXV_s, do_fp_reduction, a, gen_helper_vfp_maxs)
 TRANS(FMINV_s, do_fp_reduction, a, gen_helper_vfp_mins)
 
+/*
+ * Floating-point Immediate
+ */
+
+static bool trans_FMOVI_s(DisasContext *s, arg_FMOVI_s *a)
+{
+    switch (a->esz) {
+    case MO_32:
+    case MO_64:
+        break;
+    case MO_16:
+        if (!dc_isar_feature(aa64_fp16, s)) {
+            return false;
+        }
+        break;
+    default:
+        return false;
+    }
+    if (fp_access_check(s)) {
+        uint64_t imm = vfp_expand_imm(a->esz, a->imm);
+        write_fp_dreg(s, a->rd, tcg_constant_i64(imm));
+    }
+    return true;
+}
+
 /* Shift a TCGv src by TCGv shift_amount, put result in dst.
  * Note that it is the caller's responsibility to ensure that the
  * shift amount is in range (ie 0..31 or 0..63) and provide the ARM
@@ -8625,53 +8650,6 @@ static void disas_fp_1src(DisasContext *s, uint32_t insn)
     }
 }
 
-/* Floating point immediate
- *   31  30  29 28       24 23  22  21 20        13 12   10 9    5 4    0
- * +---+---+---+-----------+------+---+------------+-------+------+------+
- * | M | 0 | S | 1 1 1 1 0 | type | 1 |    imm8    | 1 0 0 | imm5 |  Rd  |
- * +---+---+---+-----------+------+---+------------+-------+------+------+
- */
-static void disas_fp_imm(DisasContext *s, uint32_t insn)
-{
-    int rd = extract32(insn, 0, 5);
-    int imm5 = extract32(insn, 5, 5);
-    int imm8 = extract32(insn, 13, 8);
-    int type = extract32(insn, 22, 2);
-    int mos = extract32(insn, 29, 3);
-    uint64_t imm;
-    MemOp sz;
-
-    if (mos || imm5) {
-        unallocated_encoding(s);
-        return;
-    }
-
-    switch (type) {
-    case 0:
-        sz = MO_32;
-        break;
-    case 1:
-        sz = MO_64;
-        break;
-    case 3:
-        sz = MO_16;
-        if (dc_isar_feature(aa64_fp16, s)) {
-            break;
-        }
-        /* fallthru */
-    default:
-        unallocated_encoding(s);
-        return;
-    }
-
-    if (!fp_access_check(s)) {
-        return;
-    }
-
-    imm = vfp_expand_imm(sz, imm8);
-    write_fp_dreg(s, rd, tcg_constant_i64(imm));
-}
-
 /* Handle floating point <=> fixed point conversions. Note that we can
  * also deal with fp <=> integer conversions as a special case (scale == 64)
  * OPTME: consider handling that special case specially or at least skipping
@@ -9091,7 +9069,7 @@ static void disas_data_proc_fp(DisasContext *s, uint32_t insn)
             switch (ctz32(extract32(insn, 12, 4))) {
             case 0: /* [15:12] == xxx1 */
                 /* Floating point immediate */
-                disas_fp_imm(s, insn);
+                unallocated_encoding(s); /* in decodetree */
                 break;
             case 1: /* [15:12] == xx10 */
                 /* Floating point compare */