target/arm: Convert FRINT{32, 64}[ZX] (scalar) to decodetree

Remove handle_fp_1src_single and handle_fp_1src_double as
these were the last insns decoded by those functions.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241211163036.2297116-31-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 23 insertions, 130 deletions

diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index 4a48fcf..4f7b3ee 100644
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -1340,6 +1340,11 @@ FRINTI_s        00011110 .. 1 001111 10000 ..... .....      @rr_hsd
 
 BFCVT_s         00011110 01 1 000110 10000 ..... .....      @rr_s
 
+FRINT32Z_s      00011110 0. 1 010000 10000 ..... .....      @rr_sd
+FRINT32X_s      00011110 0. 1 010001 10000 ..... .....      @rr_sd
+FRINT64Z_s      00011110 0. 1 010010 10000 ..... .....      @rr_sd
+FRINT64X_s      00011110 0. 1 010011 10000 ..... .....      @rr_sd
+
 # 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 5b30b4c..e48dd30 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -8425,112 +8425,23 @@ static const FPScalar1 f_scalar_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)
-{
-    void (*gen_fpst)(TCGv_i32, TCGv_i32, TCGv_ptr);
-    TCGv_i32 tcg_op, tcg_res;
-    TCGv_ptr fpst;
-    int rmode = -1;
-
-    tcg_op = read_fp_sreg(s, rn);
-    tcg_res = tcg_temp_new_i32();
-
-    switch (opcode) {
-    case 0x10: /* FRINT32Z */
-        rmode = FPROUNDING_ZERO;
-        gen_fpst = gen_helper_frint32_s;
-        break;
-    case 0x11: /* FRINT32X */
-        gen_fpst = gen_helper_frint32_s;
-        break;
-    case 0x12: /* FRINT64Z */
-        rmode = FPROUNDING_ZERO;
-        gen_fpst = gen_helper_frint64_s;
-        break;
-    case 0x13: /* FRINT64X */
-        gen_fpst = gen_helper_frint64_s;
-        break;
-    default:
-    case 0x0: /* FMOV */
-    case 0x1: /* FABS */
-    case 0x2: /* FNEG */
-    case 0x3: /* FSQRT */
-    case 0x6: /* BFCVT */
-    case 0x8: /* FRINTN */
-    case 0x9: /* FRINTP */
-    case 0xa: /* FRINTM */
-    case 0xb: /* FRINTZ */
-    case 0xc: /* FRINTA */
-    case 0xe: /* FRINTX */
-    case 0xf: /* FRINTI */
-        g_assert_not_reached();
-    }
-
-    fpst = fpstatus_ptr(FPST_FPCR);
-    if (rmode >= 0) {
-        TCGv_i32 tcg_rmode = gen_set_rmode(rmode, fpst);
-        gen_fpst(tcg_res, tcg_op, fpst);
-        gen_restore_rmode(tcg_rmode, fpst);
-    } else {
-        gen_fpst(tcg_res, tcg_op, fpst);
-    }
-
-    write_fp_sreg(s, rd, tcg_res);
-}
-
-/* Floating-point data-processing (1 source) - double precision */
-static void handle_fp_1src_double(DisasContext *s, int opcode, int rd, int rn)
-{
-    void (*gen_fpst)(TCGv_i64, TCGv_i64, TCGv_ptr);
-    TCGv_i64 tcg_op, tcg_res;
-    TCGv_ptr fpst;
-    int rmode = -1;
-
-    tcg_op = read_fp_dreg(s, rn);
-    tcg_res = tcg_temp_new_i64();
-
-    switch (opcode) {
-    case 0x10: /* FRINT32Z */
-        rmode = FPROUNDING_ZERO;
-        gen_fpst = gen_helper_frint32_d;
-        break;
-    case 0x11: /* FRINT32X */
-        gen_fpst = gen_helper_frint32_d;
-        break;
-    case 0x12: /* FRINT64Z */
-        rmode = FPROUNDING_ZERO;
-        gen_fpst = gen_helper_frint64_d;
-        break;
-    case 0x13: /* FRINT64X */
-        gen_fpst = gen_helper_frint64_d;
-        break;
-    default:
-    case 0x0: /* FMOV */
-    case 0x1: /* FABS */
-    case 0x2: /* FNEG */
-    case 0x3: /* FSQRT */
-    case 0x8: /* FRINTN */
-    case 0x9: /* FRINTP */
-    case 0xa: /* FRINTM */
-    case 0xb: /* FRINTZ */
-    case 0xc: /* FRINTA */
-    case 0xe: /* FRINTX */
-    case 0xf: /* FRINTI */
-        g_assert_not_reached();
-    }
-
-    fpst = fpstatus_ptr(FPST_FPCR);
-    if (rmode >= 0) {
-        TCGv_i32 tcg_rmode = gen_set_rmode(rmode, fpst);
-        gen_fpst(tcg_res, tcg_op, fpst);
-        gen_restore_rmode(tcg_rmode, fpst);
-    } else {
-        gen_fpst(tcg_res, tcg_op, fpst);
-    }
-
-    write_fp_dreg(s, rd, tcg_res);
-}
+static const FPScalar1 f_scalar_frint32 = {
+    NULL,
+    gen_helper_frint32_s,
+    gen_helper_frint32_d,
+};
+TRANS_FEAT(FRINT32Z_s, aa64_frint, do_fp1_scalar, a,
+           &f_scalar_frint32, FPROUNDING_ZERO)
+TRANS_FEAT(FRINT32X_s, aa64_frint, do_fp1_scalar, a, &f_scalar_frint32, -1)
+
+static const FPScalar1 f_scalar_frint64 = {
+    NULL,
+    gen_helper_frint64_s,
+    gen_helper_frint64_d,
+};
+TRANS_FEAT(FRINT64Z_s, aa64_frint, do_fp1_scalar, a,
+           &f_scalar_frint64, FPROUNDING_ZERO)
+TRANS_FEAT(FRINT64X_s, aa64_frint, do_fp1_scalar, a, &f_scalar_frint64, -1)
 
 static void handle_fp_fcvt(DisasContext *s, int opcode,
                            int rd, int rn, int dtype, int ntype)
@@ -8631,30 +8542,6 @@ static void disas_fp_1src(DisasContext *s, uint32_t insn)
         break;
     }
 
-    case 0x10 ... 0x13: /* FRINT{32,64}{X,Z} */
-        if (type > 1 || !dc_isar_feature(aa64_frint, s)) {
-            goto do_unallocated;
-        }
-        /* 32-to-32 and 64-to-64 ops */
-        switch (type) {
-        case 0:
-            if (!fp_access_check(s)) {
-                return;
-            }
-            handle_fp_1src_single(s, opcode, rd, rn);
-            break;
-        case 1:
-            if (!fp_access_check(s)) {
-                return;
-            }
-            handle_fp_1src_double(s, opcode, rd, rn);
-            break;
-        case 3:
-        default:
-            goto do_unallocated;
-        }
-        break;
-
     default:
     do_unallocated:
     case 0x0: /* FMOV */
@@ -8669,6 +8556,7 @@ static void disas_fp_1src(DisasContext *s, uint32_t insn)
     case 0xc: /* FRINTA */
     case 0xe: /* FRINTX */
     case 0xf: /* FRINTI */
+    case 0x10 ... 0x13: /* FRINT{32,64}{X,Z} */
         unallocated_encoding(s);
         break;
     }