target/riscv: Replace DisasContext.w with DisasContext.ol

In preparation for RV128, consider more than just "w" for
operand size modification.  This will be used for the "d"
insns from RV128 as well.

Rename oper_len to get_olen to better match get_xlen.

Reviewed-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20211020031709.359469-10-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/insn_trans/trans_rvb.c.inc

@@ -344,7 +344,7 @@ static bool trans_cpopw(DisasContext *ctx, arg_cpopw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_ZBB(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_unary(ctx, a, EXT_ZERO, tcg_gen_ctpop_tl);
 }
 
@@ -370,7 +370,7 @@ static bool trans_rorw(DisasContext *ctx, arg_rorw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_ZBB(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift(ctx, a, EXT_NONE, gen_rorw);
 }
 
@@ -378,7 +378,7 @@ static bool trans_roriw(DisasContext *ctx, arg_roriw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_ZBB(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift_imm_tl(ctx, a, EXT_NONE, gen_rorw);
 }
 
@@ -404,7 +404,7 @@ static bool trans_rolw(DisasContext *ctx, arg_rolw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_ZBB(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift(ctx, a, EXT_NONE, gen_rolw);
 }
 

target/riscv/insn_trans/trans_rvi.c.inc

@@ -331,14 +331,14 @@ static bool trans_and(DisasContext *ctx, arg_and *a)
 static bool trans_addiw(DisasContext *ctx, arg_addiw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith_imm_fn(ctx, a, EXT_NONE, tcg_gen_addi_tl);
 }
 
 static bool trans_slliw(DisasContext *ctx, arg_slliw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift_imm_fn(ctx, a, EXT_NONE, tcg_gen_shli_tl);
 }
 
@@ -350,7 +350,7 @@ static void gen_srliw(TCGv dst, TCGv src, target_long shamt)
 static bool trans_srliw(DisasContext *ctx, arg_srliw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift_imm_fn(ctx, a, EXT_NONE, gen_srliw);
 }
 
@@ -362,42 +362,42 @@ static void gen_sraiw(TCGv dst, TCGv src, target_long shamt)
 static bool trans_sraiw(DisasContext *ctx, arg_sraiw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift_imm_fn(ctx, a, EXT_NONE, gen_sraiw);
 }
 
 static bool trans_addw(DisasContext *ctx, arg_addw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_add_tl);
 }
 
 static bool trans_subw(DisasContext *ctx, arg_subw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_sub_tl);
 }
 
 static bool trans_sllw(DisasContext *ctx, arg_sllw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift(ctx, a, EXT_NONE, tcg_gen_shl_tl);
 }
 
 static bool trans_srlw(DisasContext *ctx, arg_srlw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift(ctx, a, EXT_ZERO, tcg_gen_shr_tl);
 }
 
 static bool trans_sraw(DisasContext *ctx, arg_sraw *a)
 {
     REQUIRE_64BIT(ctx);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_shift(ctx, a, EXT_SIGN, tcg_gen_sar_tl);
 }
 

target/riscv/insn_trans/trans_rvm.c.inc

@@ -214,7 +214,7 @@ static bool trans_mulw(DisasContext *ctx, arg_mulw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVM);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_mul_tl);
 }
 
@@ -222,7 +222,7 @@ static bool trans_divw(DisasContext *ctx, arg_divw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVM);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_SIGN, gen_div);
 }
 
@@ -230,7 +230,7 @@ static bool trans_divuw(DisasContext *ctx, arg_divuw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVM);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_ZERO, gen_divu);
 }
 
@@ -238,7 +238,7 @@ static bool trans_remw(DisasContext *ctx, arg_remw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVM);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_SIGN, gen_rem);
 }
 
@@ -246,6 +246,6 @@ static bool trans_remuw(DisasContext *ctx, arg_remuw *a)
 {
     REQUIRE_64BIT(ctx);
     REQUIRE_EXT(ctx, RVM);
-    ctx->w = true;
+    ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_ZERO, gen_remu);
 }

target/riscv/translate.c

@@ -67,7 +67,7 @@ typedef struct DisasContext {
        to any system register, which includes CSR_FRM, so we do not have
        to reset this known value.  */
     int frm;
-    bool w;
+    RISCVMXL ol;
     bool virt_enabled;
     bool ext_ifencei;
     bool hlsx;
@@ -104,13 +104,18 @@ static inline int __attribute__((unused)) get_xlen(DisasContext *ctx)
     return 16 << get_xl(ctx);
 }
 
-/* The word size for this operation. */
-static inline int oper_len(DisasContext *ctx)
+/* The operation length, as opposed to the xlen. */
+#ifdef TARGET_RISCV32
+#define get_ol(ctx)    MXL_RV32
+#else
+#define get_ol(ctx)    ((ctx)->ol)
+#endif
+
+static inline int get_olen(DisasContext *ctx)
 {
-    return ctx->w ? 32 : TARGET_LONG_BITS;
+    return 16 << get_ol(ctx);
 }
 
-
 /*
  * RISC-V requires NaN-boxing of narrower width floating point values.
  * This applies when a 32-bit value is assigned to a 64-bit FP register.
@@ -197,24 +202,34 @@ static TCGv get_gpr(DisasContext *ctx, int reg_num, DisasExtend ext)
         return ctx->zero;
     }
 
-    switch (ctx->w ? ext : EXT_NONE) {
-    case EXT_NONE:
-        return cpu_gpr[reg_num];
-    case EXT_SIGN:
-        t = temp_new(ctx);
-        tcg_gen_ext32s_tl(t, cpu_gpr[reg_num]);
-        return t;
-    case EXT_ZERO:
-        t = temp_new(ctx);
-        tcg_gen_ext32u_tl(t, cpu_gpr[reg_num]);
-        return t;
+    switch (get_ol(ctx)) {
+    case MXL_RV32:
+        switch (ext) {
+        case EXT_NONE:
+            break;
+        case EXT_SIGN:
+            t = temp_new(ctx);
+            tcg_gen_ext32s_tl(t, cpu_gpr[reg_num]);
+            return t;
+        case EXT_ZERO:
+            t = temp_new(ctx);
+            tcg_gen_ext32u_tl(t, cpu_gpr[reg_num]);
+            return t;
+        default:
+            g_assert_not_reached();
+        }
+        break;
+    case MXL_RV64:
+        break;
+    default:
+        g_assert_not_reached();
     }
-    g_assert_not_reached();
+    return cpu_gpr[reg_num];
 }
 
 static TCGv dest_gpr(DisasContext *ctx, int reg_num)
 {
-    if (reg_num == 0 || ctx->w) {
+    if (reg_num == 0 || get_olen(ctx) < TARGET_LONG_BITS) {
         return temp_new(ctx);
     }
     return cpu_gpr[reg_num];
@@ -223,10 +238,15 @@ static TCGv dest_gpr(DisasContext *ctx, int reg_num)
 static void gen_set_gpr(DisasContext *ctx, int reg_num, TCGv t)
 {
     if (reg_num != 0) {
-        if (ctx->w) {
+        switch (get_ol(ctx)) {
+        case MXL_RV32:
             tcg_gen_ext32s_tl(cpu_gpr[reg_num], t);
-        } else {
+            break;
+        case MXL_RV64:
             tcg_gen_mov_tl(cpu_gpr[reg_num], t);
+            break;
+        default:
+            g_assert_not_reached();
         }
     }
 }
@@ -387,7 +407,7 @@ static bool gen_shift_imm_fn(DisasContext *ctx, arg_shift *a, DisasExtend ext,
                              void (*func)(TCGv, TCGv, target_long))
 {
     TCGv dest, src1;
-    int max_len = oper_len(ctx);
+    int max_len = get_olen(ctx);
 
     if (a->shamt >= max_len) {
         return false;
@@ -406,7 +426,7 @@ static bool gen_shift_imm_tl(DisasContext *ctx, arg_shift *a, DisasExtend ext,
                              void (*func)(TCGv, TCGv, TCGv))
 {
     TCGv dest, src1, src2;
-    int max_len = oper_len(ctx);
+    int max_len = get_olen(ctx);
 
     if (a->shamt >= max_len) {
         return false;
@@ -430,7 +450,7 @@ static bool gen_shift(DisasContext *ctx, arg_r *a, DisasExtend ext,
     TCGv src2 = get_gpr(ctx, a->rs2, EXT_NONE);
     TCGv ext2 = tcg_temp_new();
 
-    tcg_gen_andi_tl(ext2, src2, oper_len(ctx) - 1);
+    tcg_gen_andi_tl(ext2, src2, get_olen(ctx) - 1);
     func(dest, src1, ext2);
 
     gen_set_gpr(ctx, a->rd, dest);
@@ -530,7 +550,6 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
     ctx->vl_eq_vlmax = FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX);
     ctx->xl = FIELD_EX32(tb_flags, TB_FLAGS, XL);
     ctx->cs = cs;
-    ctx->w = false;
     ctx->ntemp = 0;
     memset(ctx->temp, 0, sizeof(ctx->temp));
 
@@ -554,9 +573,9 @@ static void riscv_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
     CPURISCVState *env = cpu->env_ptr;
     uint16_t opcode16 = translator_lduw(env, &ctx->base, ctx->base.pc_next);
 
+    ctx->ol = ctx->xl;
     decode_opc(env, ctx, opcode16);
     ctx->base.pc_next = ctx->pc_succ_insn;
-    ctx->w = false;
 
     for (int i = ctx->ntemp - 1; i >= 0; --i) {
         tcg_temp_free(ctx->temp[i]);