target/arm: Convert VFP round insns to decodetree

Convert the VFP round-to-integer instructions VRINTR, VRINTZ and
VRINTX to decodetree.

These instructions were only introduced as part of the "VFP misc"
additions in v8A, so we check this. The old decoder's implementation
was incorrectly providing them even for v7A CPUs.

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

1 files changed, 163 insertions, 0 deletions

diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
index a19ede8671..e94a8f2f0c 100644
--- a/target/arm/translate-vfp.inc.c
+++ b/target/arm/translate-vfp.inc.c
@@ -2157,3 +2157,166 @@ static bool trans_VCVT_f16_f64(DisasContext *s, arg_VCVT_f16_f64 *a)
     tcg_temp_free_i32(tmp);
     return true;
 }
+
+static bool trans_VRINTR_sp(DisasContext *s, arg_VRINTR_sp *a)
+{
+    TCGv_ptr fpst;
+    TCGv_i32 tmp;
+
+    if (!dc_isar_feature(aa32_vrint, s)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    tmp = tcg_temp_new_i32();
+    neon_load_reg32(tmp, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    gen_helper_rints(tmp, tmp, fpst);
+    neon_store_reg32(tmp, a->vd);
+    tcg_temp_free_ptr(fpst);
+    tcg_temp_free_i32(tmp);
+    return true;
+}
+
+static bool trans_VRINTR_dp(DisasContext *s, arg_VRINTR_sp *a)
+{
+    TCGv_ptr fpst;
+    TCGv_i64 tmp;
+
+    if (!dc_isar_feature(aa32_vrint, s)) {
+        return false;
+    }
+
+    /* UNDEF accesses to D16-D31 if they don't exist. */
+    if (!dc_isar_feature(aa32_fp_d32, s) && ((a->vd | a->vm) & 0x10)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    tmp = tcg_temp_new_i64();
+    neon_load_reg64(tmp, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    gen_helper_rintd(tmp, tmp, fpst);
+    neon_store_reg64(tmp, a->vd);
+    tcg_temp_free_ptr(fpst);
+    tcg_temp_free_i64(tmp);
+    return true;
+}
+
+static bool trans_VRINTZ_sp(DisasContext *s, arg_VRINTZ_sp *a)
+{
+    TCGv_ptr fpst;
+    TCGv_i32 tmp;
+    TCGv_i32 tcg_rmode;
+
+    if (!dc_isar_feature(aa32_vrint, s)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    tmp = tcg_temp_new_i32();
+    neon_load_reg32(tmp, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    tcg_rmode = tcg_const_i32(float_round_to_zero);
+    gen_helper_set_rmode(tcg_rmode, tcg_rmode, fpst);
+    gen_helper_rints(tmp, tmp, fpst);
+    gen_helper_set_rmode(tcg_rmode, tcg_rmode, fpst);
+    neon_store_reg32(tmp, a->vd);
+    tcg_temp_free_ptr(fpst);
+    tcg_temp_free_i32(tcg_rmode);
+    tcg_temp_free_i32(tmp);
+    return true;
+}
+
+static bool trans_VRINTZ_dp(DisasContext *s, arg_VRINTZ_sp *a)
+{
+    TCGv_ptr fpst;
+    TCGv_i64 tmp;
+    TCGv_i32 tcg_rmode;
+
+    if (!dc_isar_feature(aa32_vrint, s)) {
+        return false;
+    }
+
+    /* UNDEF accesses to D16-D31 if they don't exist. */
+    if (!dc_isar_feature(aa32_fp_d32, s) && ((a->vd | a->vm) & 0x10)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    tmp = tcg_temp_new_i64();
+    neon_load_reg64(tmp, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    tcg_rmode = tcg_const_i32(float_round_to_zero);
+    gen_helper_set_rmode(tcg_rmode, tcg_rmode, fpst);
+    gen_helper_rintd(tmp, tmp, fpst);
+    gen_helper_set_rmode(tcg_rmode, tcg_rmode, fpst);
+    neon_store_reg64(tmp, a->vd);
+    tcg_temp_free_ptr(fpst);
+    tcg_temp_free_i64(tmp);
+    tcg_temp_free_i32(tcg_rmode);
+    return true;
+}
+
+static bool trans_VRINTX_sp(DisasContext *s, arg_VRINTX_sp *a)
+{
+    TCGv_ptr fpst;
+    TCGv_i32 tmp;
+
+    if (!dc_isar_feature(aa32_vrint, s)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    tmp = tcg_temp_new_i32();
+    neon_load_reg32(tmp, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    gen_helper_rints_exact(tmp, tmp, fpst);
+    neon_store_reg32(tmp, a->vd);
+    tcg_temp_free_ptr(fpst);
+    tcg_temp_free_i32(tmp);
+    return true;
+}
+
+static bool trans_VRINTX_dp(DisasContext *s, arg_VRINTX_dp *a)
+{
+    TCGv_ptr fpst;
+    TCGv_i64 tmp;
+
+    if (!dc_isar_feature(aa32_vrint, s)) {
+        return false;
+    }
+
+    /* UNDEF accesses to D16-D31 if they don't exist. */
+    if (!dc_isar_feature(aa32_fp_d32, s) && ((a->vd | a->vm) & 0x10)) {
+        return false;
+    }
+
+    if (!vfp_access_check(s)) {
+        return true;
+    }
+
+    tmp = tcg_temp_new_i64();
+    neon_load_reg64(tmp, a->vm);
+    fpst = get_fpstatus_ptr(false);
+    gen_helper_rintd_exact(tmp, tmp, fpst);
+    neon_store_reg64(tmp, a->vd);
+    tcg_temp_free_ptr(fpst);
+    tcg_temp_free_i64(tmp);
+    return true;
+}