[PATCH 12/45] target/riscv: Add vbrev8.v decoding, translation and execution support

[Lawrence Hunter <lawrence.hunter@codethink.co.uk>]

From: William Salmon <will.salmon@codethink.co.uk>

Signed-off-by: William Salmon <will.salmon@codethink.co.uk>
---
 target/riscv/helper.h                      |  5 +++
 target/riscv/insn32.decode                 |  1 +
 target/riscv/insn_trans/trans_rvzvkb.c.inc | 38 ++++++++++++++++++++++
 target/riscv/vcrypto_helper.c              | 21 ++++++++++++
 4 files changed, 65 insertions(+)

diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index 841cb43f04..625f9872d0 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -1168,3 +1168,8 @@ DEF_HELPER_6(vrol_vx_b, void, ptr, ptr, tl, ptr, env, i32)
 DEF_HELPER_6(vrol_vx_h, void, ptr, ptr, tl, ptr, env, i32)
 DEF_HELPER_6(vrol_vx_w, void, ptr, ptr, tl, ptr, env, i32)
 DEF_HELPER_6(vrol_vx_d, void, ptr, ptr, tl, ptr, env, i32)
+
+DEF_HELPER_5(vbrev8_v_b, void, ptr, ptr, ptr, env, i32)
+DEF_HELPER_5(vbrev8_v_h, void, ptr, ptr, ptr, env, i32)
+DEF_HELPER_5(vbrev8_v_w, void, ptr, ptr, ptr, env, i32)
+DEF_HELPER_5(vbrev8_v_d, void, ptr, ptr, ptr, env, i32)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index c557c063df..87473a77c0 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -921,3 +921,4 @@ vrol_vx         010101 . ..... ..... 100 ..... 1010111 @r_vm
 vror_vv         010100 . ..... ..... 000 ..... 1010111 @r_vm
 vror_vx         010100 . ..... ..... 100 ..... 1010111 @r_vm
 vror_vi         01010. . ..... ..... 011 ..... 1010111 @r2_zimm6
+vbrev8_v        010010 . ..... 01000 010 ..... 1010111 @r2_vm
diff --git a/target/riscv/insn_trans/trans_rvzvkb.c.inc b/target/riscv/insn_trans/trans_rvzvkb.c.inc
index f71383e482..7cd114ae71 100644
--- a/target/riscv/insn_trans/trans_rvzvkb.c.inc
+++ b/target/riscv/insn_trans/trans_rvzvkb.c.inc
@@ -145,3 +145,41 @@ GEN_OPIVX_GVEC_SHIFT_TRANS_CHECK(vrol_vx, rotls, zvkb_vx_check)
 GEN_OPIVV_GVEC_TRANS_CHECK(vror_vv, rotrv, zvkb_vv_check)
 GEN_OPIVX_GVEC_SHIFT_TRANS_CHECK(vror_vx, rotrs, zvkb_vx_check)
 GEN_OPIVI_GVEC_TRANS_CHECK(vror_vi, IMM_ZIMM6, vror_vx, rotri, zvkb_vx_check)
+
+#define GEN_OPIV_TRANS(NAME, CHECK)                                    \
+static bool trans_##NAME(DisasContext *s, arg_rmr * a)                 \
+{                                                                      \
+    if (CHECK(s, a)) {                                                 \
+        uint32_t data = 0;                                             \
+        static gen_helper_gvec_3_ptr * const fns[4] = {                \
+            gen_helper_##NAME##_b, gen_helper_##NAME##_h,              \
+            gen_helper_##NAME##_w, gen_helper_##NAME##_d,              \
+        };                                                             \
+        TCGLabel *over = gen_new_label();                              \
+        tcg_gen_brcond_tl(TCG_COND_GEU, cpu_vstart, cpu_vl, over);     \
+                                                                       \
+        data = FIELD_DP32(data, VDATA, VM, a->vm);                     \
+        data = FIELD_DP32(data, VDATA, LMUL, s->lmul);                 \
+        data = FIELD_DP32(data, VDATA, VTA, s->vta);                   \
+        data = FIELD_DP32(data, VDATA, VTA_ALL_1S, s->cfg_vta_all_1s); \
+        data = FIELD_DP32(data, VDATA, VMA, s->vma);                   \
+        tcg_gen_gvec_3_ptr(vreg_ofs(s, a->rd), vreg_ofs(s, 0),         \
+                           vreg_ofs(s, a->rs2), cpu_env,               \
+                           s->cfg_ptr->vlen / 8, s->cfg_ptr->vlen / 8, \
+                           data, fns[s->sew]);                         \
+        mark_vs_dirty(s);                                              \
+        gen_set_label(over);                                           \
+        return true;                                                   \
+    }                                                                  \
+    return false;                                                      \
+}
+
+static bool vxrev8_check(DisasContext *s, arg_rmr *a)
+{
+    return s->cfg_ptr->ext_zvkb == true &&
+           require_rvv(s) &&
+           vext_check_isa_ill(s) &&
+           vext_check_ss(s, a->rd, a->rs2, a->vm);
+}
+
+GEN_OPIV_TRANS(vbrev8_v, vxrev8_check)
diff --git a/target/riscv/vcrypto_helper.c b/target/riscv/vcrypto_helper.c
index 30ed9b1270..5d2a995de6 100644
--- a/target/riscv/vcrypto_helper.c
+++ b/target/riscv/vcrypto_helper.c
@@ -93,3 +93,24 @@ GEN_VEXT_VX(vrol_vx_b, 1)
 GEN_VEXT_VX(vrol_vx_h, 2)
 GEN_VEXT_VX(vrol_vx_w, 4)
 GEN_VEXT_VX(vrol_vx_d, 8)
+
+static uint64_t brev8(uint64_t val)
+{
+    val = ((val & 0x5555555555555555ull) << 1)
+        | ((val & 0xAAAAAAAAAAAAAAAAull) >> 1);
+    val = ((val & 0x3333333333333333ull) << 2)
+        | ((val & 0xCCCCCCCCCCCCCCCCull) >> 2);
+    val = ((val & 0x0F0F0F0F0F0F0F0Full) << 4)
+        | ((val & 0xF0F0F0F0F0F0F0F0ull) >> 4);
+
+    return val;
+}
+
+RVVCALL(OPIVV1, vbrev8_v_b, OP_UU_B, H1, H1, brev8)
+RVVCALL(OPIVV1, vbrev8_v_h, OP_UU_H, H2, H2, brev8)
+RVVCALL(OPIVV1, vbrev8_v_w, OP_UU_W, H4, H4, brev8)
+RVVCALL(OPIVV1, vbrev8_v_d, OP_UU_D, H8, H8, brev8)
+GEN_VEXT_V(vbrev8_v_b, 1)
+GEN_VEXT_V(vbrev8_v_h, 2)
+GEN_VEXT_V(vbrev8_v_w, 4)
+GEN_VEXT_V(vbrev8_v_d, 8)
-- 
2.39.2