target/arm: Implement SVE floating-point round to integral value

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180627043328.11531-26-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 77 insertions, 0 deletions

diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index 969afa55e4..02ff41fb70 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -4040,6 +4040,83 @@ static bool trans_FCVTZU_dd(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
     return do_zpz_ptr(s, a->rd, a->rn, a->pg, false, gen_helper_sve_fcvtzu_dd);
 }
 
+static gen_helper_gvec_3_ptr * const frint_fns[3] = {
+    gen_helper_sve_frint_h,
+    gen_helper_sve_frint_s,
+    gen_helper_sve_frint_d
+};
+
+static bool trans_FRINTI(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
+{
+    if (a->esz == 0) {
+        return false;
+    }
+    return do_zpz_ptr(s, a->rd, a->rn, a->pg, a->esz == MO_16,
+                      frint_fns[a->esz - 1]);
+}
+
+static bool trans_FRINTX(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
+{
+    static gen_helper_gvec_3_ptr * const fns[3] = {
+        gen_helper_sve_frintx_h,
+        gen_helper_sve_frintx_s,
+        gen_helper_sve_frintx_d
+    };
+    if (a->esz == 0) {
+        return false;
+    }
+    return do_zpz_ptr(s, a->rd, a->rn, a->pg, a->esz == MO_16, fns[a->esz - 1]);
+}
+
+static bool do_frint_mode(DisasContext *s, arg_rpr_esz *a, int mode)
+{
+    if (a->esz == 0) {
+        return false;
+    }
+    if (sve_access_check(s)) {
+        unsigned vsz = vec_full_reg_size(s);
+        TCGv_i32 tmode = tcg_const_i32(mode);
+        TCGv_ptr status = get_fpstatus_ptr(a->esz == MO_16);
+
+        gen_helper_set_rmode(tmode, tmode, status);
+
+        tcg_gen_gvec_3_ptr(vec_full_reg_offset(s, a->rd),
+                           vec_full_reg_offset(s, a->rn),
+                           pred_full_reg_offset(s, a->pg),
+                           status, vsz, vsz, 0, frint_fns[a->esz - 1]);
+
+        gen_helper_set_rmode(tmode, tmode, status);
+        tcg_temp_free_i32(tmode);
+        tcg_temp_free_ptr(status);
+    }
+    return true;
+}
+
+static bool trans_FRINTN(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
+{
+    return do_frint_mode(s, a, float_round_nearest_even);
+}
+
+static bool trans_FRINTP(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
+{
+    return do_frint_mode(s, a, float_round_up);
+}
+
+static bool trans_FRINTM(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
+{
+    return do_frint_mode(s, a, float_round_down);
+}
+
+static bool trans_FRINTZ(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
+{
+    return do_frint_mode(s, a, float_round_to_zero);
+}
+
+static bool trans_FRINTA(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
+{
+    return do_frint_mode(s, a, float_round_ties_away);
+}
+
 static bool trans_SCVTF_hh(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
 {
     return do_zpz_ptr(s, a->rd, a->rn, a->pg, true, gen_helper_sve_scvt_hh);