target/riscv: Remove mstatus_hs_{fs, vs} from tb_flags

Merge with mstatus_{fs,vs}.  We might perform a redundant
assignment to one or the other field, but it's a trivial
and saves 4 bits from TB_FLAGS.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Tested-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-Id: <20230325105429.1142530-5-richard.henderson@linaro.org>
Message-Id: <20230412114333.118895-5-richard.henderson@linaro.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

3 files changed, 33 insertions, 48 deletions

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 51d3968..ab64d5f 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -644,19 +644,17 @@ FIELD(TB_FLAGS, VL_EQ_VLMAX, 13, 1)
 FIELD(TB_FLAGS, VILL, 14, 1)
 /* Is a Hypervisor instruction load/store allowed? */
 FIELD(TB_FLAGS, HLSX, 15, 1)
-FIELD(TB_FLAGS, MSTATUS_HS_FS, 16, 2)
-FIELD(TB_FLAGS, MSTATUS_HS_VS, 18, 2)
 /* The combination of MXL/SXL/UXL that applies to the current cpu mode. */
-FIELD(TB_FLAGS, XL, 20, 2)
+FIELD(TB_FLAGS, XL, 16, 2)
 /* If PointerMasking should be applied */
-FIELD(TB_FLAGS, PM_MASK_ENABLED, 22, 1)
-FIELD(TB_FLAGS, PM_BASE_ENABLED, 23, 1)
-FIELD(TB_FLAGS, VTA, 24, 1)
-FIELD(TB_FLAGS, VMA, 25, 1)
+FIELD(TB_FLAGS, PM_MASK_ENABLED, 18, 1)
+FIELD(TB_FLAGS, PM_BASE_ENABLED, 19, 1)
+FIELD(TB_FLAGS, VTA, 20, 1)
+FIELD(TB_FLAGS, VMA, 21, 1)
 /* Native debug itrigger */
-FIELD(TB_FLAGS, ITRIGGER, 26, 1)
+FIELD(TB_FLAGS, ITRIGGER, 22, 1)
 /* Virtual mode enabled */
-FIELD(TB_FLAGS, VIRT_ENABLED, 27, 1)
+FIELD(TB_FLAGS, VIRT_ENABLED, 23, 1)
 
 #ifdef TARGET_RISCV32
 #define riscv_cpu_mxl(env)  ((void)(env), MXL_RV32)
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 8412ef2..e3e6201 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -45,7 +45,7 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
 {
     CPUState *cs = env_cpu(env);
     RISCVCPU *cpu = RISCV_CPU(cs);
-
+    RISCVExtStatus fs, vs;
     uint32_t flags = 0;
 
     *pc = env->xl == MXL_RV32 ? env->pc & UINT32_MAX : env->pc;
@@ -79,18 +79,12 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
     }
 
 #ifdef CONFIG_USER_ONLY
-    flags = FIELD_DP32(flags, TB_FLAGS, FS, EXT_STATUS_DIRTY);
-    flags = FIELD_DP32(flags, TB_FLAGS, VS, EXT_STATUS_DIRTY);
+    fs = EXT_STATUS_DIRTY;
+    vs = EXT_STATUS_DIRTY;
 #else
     flags |= cpu_mmu_index(env, 0);
-    if (riscv_cpu_fp_enabled(env)) {
-        flags = FIELD_DP32(flags, TB_FLAGS, FS,
-                           get_field(env->mstatus, MSTATUS_FS));
-    }
-    if (riscv_cpu_vector_enabled(env)) {
-        flags = FIELD_DP32(flags, TB_FLAGS, VS,
-                           get_field(env->mstatus, MSTATUS_VS));
-    }
+    fs = get_field(env->mstatus, MSTATUS_FS);
+    vs = get_field(env->mstatus, MSTATUS_VS);
 
     if (riscv_has_ext(env, RVH)) {
         if (env->priv == PRV_M ||
@@ -100,18 +94,23 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
             flags = FIELD_DP32(flags, TB_FLAGS, HLSX, 1);
         }
 
-        flags = FIELD_DP32(flags, TB_FLAGS, MSTATUS_HS_FS,
-                           get_field(env->mstatus_hs, MSTATUS_FS));
-
-        flags = FIELD_DP32(flags, TB_FLAGS, MSTATUS_HS_VS,
-                           get_field(env->mstatus_hs, MSTATUS_VS));
-        flags = FIELD_DP32(flags, TB_FLAGS, VIRT_ENABLED, env->virt_enabled);
+        if (env->virt_enabled) {
+            flags = FIELD_DP32(flags, TB_FLAGS, VIRT_ENABLED, 1);
+            /*
+             * Merge DISABLED and !DIRTY states using MIN.
+             * We will set both fields when dirtying.
+             */
+            fs = MIN(fs, get_field(env->mstatus_hs, MSTATUS_FS));
+            vs = MIN(vs, get_field(env->mstatus_hs, MSTATUS_VS));
+        }
     }
     if (cpu->cfg.debug && !icount_enabled()) {
         flags = FIELD_DP32(flags, TB_FLAGS, ITRIGGER, env->itrigger_enabled);
     }
 #endif
 
+    flags = FIELD_DP32(flags, TB_FLAGS, FS, fs);
+    flags = FIELD_DP32(flags, TB_FLAGS, VS, vs);
     flags = FIELD_DP32(flags, TB_FLAGS, XL, env->xl);
     if (env->cur_pmmask < (env->xl == MXL_RV32 ? UINT32_MAX : UINT64_MAX)) {
         flags = FIELD_DP32(flags, TB_FLAGS, PM_MASK_ENABLED, 1);
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 411e771..3092c94 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -66,8 +66,6 @@ typedef struct DisasContext {
     uint32_t opcode;
     RISCVExtStatus mstatus_fs;
     RISCVExtStatus mstatus_vs;
-    RISCVExtStatus mstatus_hs_fs;
-    RISCVExtStatus mstatus_hs_vs;
     uint32_t mem_idx;
     /*
      * Remember the rounding mode encoded in the previous fp instruction,
@@ -620,16 +618,12 @@ static void mark_fs_dirty(DisasContext *ctx)
         tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus));
         tcg_gen_ori_tl(tmp, tmp, MSTATUS_FS);
         tcg_gen_st_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus));
-    }
-
-    if (ctx->virt_enabled && ctx->mstatus_hs_fs != EXT_STATUS_DIRTY) {
-        /* Remember the stage change for the rest of the TB. */
-        ctx->mstatus_hs_fs = EXT_STATUS_DIRTY;
 
-        tmp = tcg_temp_new();
-        tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
-        tcg_gen_ori_tl(tmp, tmp, MSTATUS_FS);
-        tcg_gen_st_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
+        if (ctx->virt_enabled) {
+            tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
+            tcg_gen_ori_tl(tmp, tmp, MSTATUS_FS);
+            tcg_gen_st_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
+        }
     }
 }
 #else
@@ -653,16 +647,12 @@ static void mark_vs_dirty(DisasContext *ctx)
         tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus));
         tcg_gen_ori_tl(tmp, tmp, MSTATUS_VS);
         tcg_gen_st_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus));
-    }
-
-    if (ctx->virt_enabled && ctx->mstatus_hs_vs != EXT_STATUS_DIRTY) {
-        /* Remember the stage change for the rest of the TB. */
-        ctx->mstatus_hs_vs = EXT_STATUS_DIRTY;
 
-        tmp = tcg_temp_new();
-        tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
-        tcg_gen_ori_tl(tmp, tmp, MSTATUS_VS);
-        tcg_gen_st_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
+        if (ctx->virt_enabled) {
+            tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
+            tcg_gen_ori_tl(tmp, tmp, MSTATUS_VS);
+            tcg_gen_st_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus_hs));
+        }
     }
 }
 #else
@@ -1171,8 +1161,6 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
     ctx->misa_ext = env->misa_ext;
     ctx->frm = -1;  /* unknown rounding mode */
     ctx->cfg_ptr = &(cpu->cfg);
-    ctx->mstatus_hs_fs = FIELD_EX32(tb_flags, TB_FLAGS, MSTATUS_HS_FS);
-    ctx->mstatus_hs_vs = FIELD_EX32(tb_flags, TB_FLAGS, MSTATUS_HS_VS);
     ctx->hlsx = FIELD_EX32(tb_flags, TB_FLAGS, HLSX);
     ctx->vill = FIELD_EX32(tb_flags, TB_FLAGS, VILL);
     ctx->sew = FIELD_EX32(tb_flags, TB_FLAGS, SEW);