target/arm: Implement SVE2 FCVTNT

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stephen Long <steplong@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210525010358.152808-73-richard.henderson@linaro.org
Message-Id: <20200428174332.17162-2-steplong@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/helper-sve.h

@@ -2744,3 +2744,8 @@ DEF_HELPER_FLAGS_5(sve2_cdot_idx_s, TCG_CALL_NO_RWG,
                    void, ptr, ptr, ptr, ptr, i32)
 DEF_HELPER_FLAGS_5(sve2_cdot_idx_d, TCG_CALL_NO_RWG,
                    void, ptr, ptr, ptr, ptr, i32)
+
+DEF_HELPER_FLAGS_5(sve2_fcvtnt_sh, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_5(sve2_fcvtnt_ds, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, ptr, i32)

target/arm/sve.decode

@@ -1580,3 +1580,7 @@ SM4E            01000101 00 10001 1 11100 0 ..... .....  @rdn_rm_e0
 # SVE2 crypto constructive binary operations
 SM4EKEY         01000101 00 1 ..... 11110 0 ..... .....  @rd_rn_rm_e0
 RAX1            01000101 00 1 ..... 11110 1 ..... .....  @rd_rn_rm_e0
+
+### SVE2 floating-point convert precision odd elements
+FCVTNT_sh       01100100 10 0010 00 101 ... ..... .....  @rd_pg_rn_e0
+FCVTNT_ds       01100100 11 0010 10 101 ... ..... .....  @rd_pg_rn_e0

target/arm/sve_helper.c

@@ -7602,3 +7602,23 @@ void HELPER(fmmla_d)(void *vd, void *vn, void *vm, void *va,
         d[3] = float64_add(a[3], float64_add(p0, p1, status), status);
     }
 }
+
+#define DO_FCVTNT(NAME, TYPEW, TYPEN, HW, HN, OP)                             \
+void HELPER(NAME)(void *vd, void *vn, void *vg, void *status, uint32_t desc)  \
+{                                                                             \
+    intptr_t i = simd_oprsz(desc);                                            \
+    uint64_t *g = vg;                                                         \
+    do {                                                                      \
+        uint64_t pg = g[(i - 1) >> 6];                                        \
+        do {                                                                  \
+            i -= sizeof(TYPEW);                                               \
+            if (likely((pg >> (i & 63)) & 1)) {                               \
+                TYPEW nn = *(TYPEW *)(vn + HW(i));                            \
+                *(TYPEN *)(vd + HN(i + sizeof(TYPEN))) = OP(nn, status);      \
+            }                                                                 \
+        } while (i & 63);                                                     \
+    } while (i != 0);                                                         \
+}
+
+DO_FCVTNT(sve2_fcvtnt_sh, uint32_t, uint16_t, H1_4, H1_2, sve_f32_to_f16)
+DO_FCVTNT(sve2_fcvtnt_ds, uint64_t, uint32_t,     , H1_4, float64_to_float32)

target/arm/translate-sve.c

@@ -8246,3 +8246,19 @@ static bool trans_RAX1(DisasContext *s, arg_rrr_esz *a)
     }
     return true;
 }
+
+static bool trans_FCVTNT_sh(DisasContext *s, arg_rpr_esz *a)
+{
+    if (!dc_isar_feature(aa64_sve2, s)) {
+        return false;
+    }
+    return do_zpz_ptr(s, a->rd, a->rn, a->pg, false, gen_helper_sve2_fcvtnt_sh);
+}
+
+static bool trans_FCVTNT_ds(DisasContext *s, arg_rpr_esz *a)
+{
+    if (!dc_isar_feature(aa64_sve2, s)) {
+        return false;
+    }
+    return do_zpz_ptr(s, a->rd, a->rn, a->pg, false, gen_helper_sve2_fcvtnt_ds);
+}