target/loongarch: Implement vsat

This patch includes:
- VSAT.{B/H/W/D}[U].

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20230504122810.4094787-18-gaosong@loongson.cn>

5 files changed, 168 insertions, 0 deletions

diff --git a/target/loongarch/disas.c b/target/loongarch/disas.c
index 6e4f676..b04aefe 100644
--- a/target/loongarch/disas.c
+++ b/target/loongarch/disas.c
@@ -1061,3 +1061,12 @@ INSN_LSX(vmod_bu,          vvv)
 INSN_LSX(vmod_hu,          vvv)
 INSN_LSX(vmod_wu,          vvv)
 INSN_LSX(vmod_du,          vvv)
+
+INSN_LSX(vsat_b,           vv_i)
+INSN_LSX(vsat_h,           vv_i)
+INSN_LSX(vsat_w,           vv_i)
+INSN_LSX(vsat_d,           vv_i)
+INSN_LSX(vsat_bu,          vv_i)
+INSN_LSX(vsat_hu,          vv_i)
+INSN_LSX(vsat_wu,          vv_i)
+INSN_LSX(vsat_du,          vv_i)
diff --git a/target/loongarch/helper.h b/target/loongarch/helper.h
index 7b7c685..d2b1c9f 100644
--- a/target/loongarch/helper.h
+++ b/target/loongarch/helper.h
@@ -320,3 +320,12 @@ DEF_HELPER_4(vmod_bu, void, env, i32, i32, i32)
 DEF_HELPER_4(vmod_hu, void, env, i32, i32, i32)
 DEF_HELPER_4(vmod_wu, void, env, i32, i32, i32)
 DEF_HELPER_4(vmod_du, void, env, i32, i32, i32)
+
+DEF_HELPER_FLAGS_4(vsat_b, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
+DEF_HELPER_FLAGS_4(vsat_h, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
+DEF_HELPER_FLAGS_4(vsat_w, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
+DEF_HELPER_FLAGS_4(vsat_d, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
+DEF_HELPER_FLAGS_4(vsat_bu, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
+DEF_HELPER_FLAGS_4(vsat_hu, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
+DEF_HELPER_FLAGS_4(vsat_wu, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
+DEF_HELPER_FLAGS_4(vsat_du, TCG_CALL_NO_RWG, void, ptr, ptr, i64, i32)
diff --git a/target/loongarch/insn_trans/trans_lsx.c.inc b/target/loongarch/insn_trans/trans_lsx.c.inc
index b295a9c..b8f05c6 100644
--- a/target/loongarch/insn_trans/trans_lsx.c.inc
+++ b/target/loongarch/insn_trans/trans_lsx.c.inc
@@ -2693,3 +2693,104 @@ TRANS(vmod_bu, gen_vvv, gen_helper_vmod_bu)
 TRANS(vmod_hu, gen_vvv, gen_helper_vmod_hu)
 TRANS(vmod_wu, gen_vvv, gen_helper_vmod_wu)
 TRANS(vmod_du, gen_vvv, gen_helper_vmod_du)
+
+static void gen_vsat_s(unsigned vece, TCGv_vec t, TCGv_vec a, TCGv_vec max)
+{
+    TCGv_vec min;
+
+    min = tcg_temp_new_vec_matching(t);
+    tcg_gen_not_vec(vece, min, max);
+    tcg_gen_smax_vec(vece, t, a, min);
+    tcg_gen_smin_vec(vece, t, t, max);
+}
+
+static void do_vsat_s(unsigned vece, uint32_t vd_ofs, uint32_t vj_ofs,
+                      int64_t imm, uint32_t oprsz, uint32_t maxsz)
+{
+    static const TCGOpcode vecop_list[] = {
+        INDEX_op_smax_vec, INDEX_op_smin_vec, 0
+        };
+    static const GVecGen2s op[4] = {
+        {
+            .fniv = gen_vsat_s,
+            .fno = gen_helper_vsat_b,
+            .opt_opc = vecop_list,
+            .vece = MO_8
+        },
+        {
+            .fniv = gen_vsat_s,
+            .fno = gen_helper_vsat_h,
+            .opt_opc = vecop_list,
+            .vece = MO_16
+        },
+        {
+            .fniv = gen_vsat_s,
+            .fno = gen_helper_vsat_w,
+            .opt_opc = vecop_list,
+            .vece = MO_32
+        },
+        {
+            .fniv = gen_vsat_s,
+            .fno = gen_helper_vsat_d,
+            .opt_opc = vecop_list,
+            .vece = MO_64
+        },
+    };
+
+    tcg_gen_gvec_2s(vd_ofs, vj_ofs, oprsz, maxsz,
+                    tcg_constant_i64((1ll<< imm) -1), &op[vece]);
+}
+
+TRANS(vsat_b, gvec_vv_i, MO_8, do_vsat_s)
+TRANS(vsat_h, gvec_vv_i, MO_16, do_vsat_s)
+TRANS(vsat_w, gvec_vv_i, MO_32, do_vsat_s)
+TRANS(vsat_d, gvec_vv_i, MO_64, do_vsat_s)
+
+static void gen_vsat_u(unsigned vece, TCGv_vec t, TCGv_vec a, TCGv_vec max)
+{
+    tcg_gen_umin_vec(vece, t, a, max);
+}
+
+static void do_vsat_u(unsigned vece, uint32_t vd_ofs, uint32_t vj_ofs,
+                       int64_t imm, uint32_t oprsz, uint32_t maxsz)
+{
+    uint64_t max;
+    static const TCGOpcode vecop_list[] = {
+        INDEX_op_umin_vec, 0
+        };
+    static const GVecGen2s op[4] = {
+        {
+            .fniv = gen_vsat_u,
+            .fno = gen_helper_vsat_bu,
+            .opt_opc = vecop_list,
+            .vece = MO_8
+        },
+        {
+            .fniv = gen_vsat_u,
+            .fno = gen_helper_vsat_hu,
+            .opt_opc = vecop_list,
+            .vece = MO_16
+        },
+        {
+            .fniv = gen_vsat_u,
+            .fno = gen_helper_vsat_wu,
+            .opt_opc = vecop_list,
+            .vece = MO_32
+        },
+        {
+            .fniv = gen_vsat_u,
+            .fno = gen_helper_vsat_du,
+            .opt_opc = vecop_list,
+            .vece = MO_64
+        },
+    };
+
+    max = (imm == 0x3f) ? UINT64_MAX : (1ull << (imm + 1)) - 1;
+    tcg_gen_gvec_2s(vd_ofs, vj_ofs, oprsz, maxsz,
+                    tcg_constant_i64(max), &op[vece]);
+}
+
+TRANS(vsat_bu, gvec_vv_i, MO_8, do_vsat_u)
+TRANS(vsat_hu, gvec_vv_i, MO_16, do_vsat_u)
+TRANS(vsat_wu, gvec_vv_i, MO_32, do_vsat_u)
+TRANS(vsat_du, gvec_vv_i, MO_64, do_vsat_u)
diff --git a/target/loongarch/insns.decode b/target/loongarch/insns.decode
index 67d016e..3ed61b3 100644
--- a/target/loongarch/insns.decode
+++ b/target/loongarch/insns.decode
@@ -499,7 +499,10 @@ dbcl             0000 00000010 10101 ...............      @i15
 #
 @vv               .... ........ ..... ..... vj:5 vd:5    &vv
 @vvv               .... ........ ..... vk:5 vj:5 vd:5    &vvv
+@vv_ui3        .... ........ ..... .. imm:3 vj:5 vd:5    &vv_i
+@vv_ui4         .... ........ ..... . imm:4 vj:5 vd:5    &vv_i
 @vv_ui5           .... ........ ..... imm:5 vj:5 vd:5    &vv_i
+@vv_ui6            .... ........ .... imm:6 vj:5 vd:5    &vv_i
 @vv_i5           .... ........ ..... imm:s5 vj:5 vd:5    &vv_i
 
 vadd_b           0111 00000000 10100 ..... ..... .....    @vvv
@@ -757,3 +760,12 @@ vmod_bu          0111 00001110 01100 ..... ..... .....    @vvv
 vmod_hu          0111 00001110 01101 ..... ..... .....    @vvv
 vmod_wu          0111 00001110 01110 ..... ..... .....    @vvv
 vmod_du          0111 00001110 01111 ..... ..... .....    @vvv
+
+vsat_b           0111 00110010 01000 01 ... ..... .....   @vv_ui3
+vsat_h           0111 00110010 01000 1 .... ..... .....   @vv_ui4
+vsat_w           0111 00110010 01001 ..... ..... .....    @vv_ui5
+vsat_d           0111 00110010 0101 ...... ..... .....    @vv_ui6
+vsat_bu          0111 00110010 10000 01 ... ..... .....   @vv_ui3
+vsat_hu          0111 00110010 10000 1 .... ..... .....   @vv_ui4
+vsat_wu          0111 00110010 10001 ..... ..... .....    @vv_ui5
+vsat_du          0111 00110010 1001 ...... ..... .....    @vv_ui6
diff --git a/target/loongarch/lsx_helper.c b/target/loongarch/lsx_helper.c
index 018009b..9ba16ac 100644
--- a/target/loongarch/lsx_helper.c
+++ b/target/loongarch/lsx_helper.c
@@ -590,3 +590,40 @@ VDIV(vmod_bu, 8, UB, DO_REMU)
 VDIV(vmod_hu, 16, UH, DO_REMU)
 VDIV(vmod_wu, 32, UW, DO_REMU)
 VDIV(vmod_du, 64, UD, DO_REMU)
+
+#define VSAT_S(NAME, BIT, E)                                    \
+void HELPER(NAME)(void *vd, void *vj, uint64_t max, uint32_t v) \
+{                                                               \
+    int i;                                                      \
+    VReg *Vd = (VReg *)vd;                                      \
+    VReg *Vj = (VReg *)vj;                                      \
+    typedef __typeof(Vd->E(0)) TD;                              \
+                                                                \
+    for (i = 0; i < LSX_LEN/BIT; i++) {                         \
+        Vd->E(i) = Vj->E(i) > (TD)max ? (TD)max :               \
+                   Vj->E(i) < (TD)~max ? (TD)~max: Vj->E(i);    \
+    }                                                           \
+}
+
+VSAT_S(vsat_b, 8, B)
+VSAT_S(vsat_h, 16, H)
+VSAT_S(vsat_w, 32, W)
+VSAT_S(vsat_d, 64, D)
+
+#define VSAT_U(NAME, BIT, E)                                    \
+void HELPER(NAME)(void *vd, void *vj, uint64_t max, uint32_t v) \
+{                                                               \
+    int i;                                                      \
+    VReg *Vd = (VReg *)vd;                                      \
+    VReg *Vj = (VReg *)vj;                                      \
+    typedef __typeof(Vd->E(0)) TD;                              \
+                                                                \
+    for (i = 0; i < LSX_LEN/BIT; i++) {                         \
+        Vd->E(i) = Vj->E(i) > (TD)max ? (TD)max : Vj->E(i);     \
+    }                                                           \
+}
+
+VSAT_U(vsat_bu, 8, UB)
+VSAT_U(vsat_hu, 16, UH)
+VSAT_U(vsat_wu, 32, UW)
+VSAT_U(vsat_du, 64, UD)