[v2,12/12] target/riscv/cpu.c: remove cpu->cfg.vlen

Commit Message

Daniel Henrique Barboza Jan. 15, 2024, 10:25 p.m. UTC

There is no need to keep both 'vlen' and 'vlenb'. All existing code
that requires 'vlen' is retrieving it via 'vlenb << 3'.

Signed-off-by: Daniel Henrique Barboza <[e-mail]>
---
 target/riscv/cpu.c         | 8 +++-----
 target/riscv/cpu_cfg.h     | 1 -
 target/riscv/tcg/tcg-cpu.c | 4 +++-
 3 files changed, 6 insertions(+), 7 deletions(-)

Comments

Richard Henderson Jan. 15, 2024, 11:15 p.m. UTC | #1

On 1/16/24 09:25, Daniel Henrique Barboza wrote:
> There is no need to keep both 'vlen' and 'vlenb'. All existing code
> that requires 'vlen' is retrieving it via 'vlenb << 3'.
> 
> Signed-off-by: Daniel Henrique Barboza<[e-mail]>
> ---
>   target/riscv/cpu.c         | 8 +++-----
>   target/riscv/cpu_cfg.h     | 1 -
>   target/riscv/tcg/tcg-cpu.c | 4 +++-
>   3 files changed, 6 insertions(+), 7 deletions(-)

Reviewed-by: Richard Henderson <[e-mail]>

r~

Patch

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index f4261d2ffc..7b3f69d3fb 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -1313,7 +1313,6 @@  static void riscv_cpu_init(Object *obj)
 
     /* Default values for non-bool cpu properties */
     cpu->cfg.pmu_mask = MAKE_64BIT_MASK(3, 16);
-    cpu->cfg.vlen = 128;
     cpu->cfg.vlenb = 128 >> 3;
     cpu->cfg.elen = 64;
     cpu->env.vext_ver = VEXT_VERSION_1_00_0;
@@ -1802,22 +1801,21 @@  static void prop_vlen_set(Object *obj, Visitor *v, const char *name,
         return;
     }
 
-    if (value != cpu->cfg.vlen && riscv_cpu_is_vendor(obj)) {
+    if (value != cpu->cfg.vlenb && riscv_cpu_is_vendor(obj)) {
         cpu_set_prop_err(cpu, name, errp);
         error_append_hint(errp, "Current '%s' val: %u\n",
-                          name, cpu->cfg.vlen);
+                          name, cpu->cfg.vlenb << 3);
         return;
     }
 
     cpu_option_add_user_setting(name, value);
-    cpu->cfg.vlen = value;
     cpu->cfg.vlenb = value >> 3;
 }
 
 static void prop_vlen_get(Object *obj, Visitor *v, const char *name,
                          void *opaque, Error **errp)
 {
-    uint16_t value = RISCV_CPU(obj)->cfg.vlen;
+    uint16_t value = RISCV_CPU(obj)->cfg.vlenb << 3;
 
     visit_type_uint16(v, name, &value, errp);
 }
diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
index 50479dd72f..e241922f89 100644
--- a/target/riscv/cpu_cfg.h
+++ b/target/riscv/cpu_cfg.h
@@ -139,7 +139,6 @@  struct RISCVCPUConfig {
     bool ext_XVentanaCondOps;
 
     uint32_t pmu_mask;
-    uint16_t vlen;
     uint16_t vlenb;
     uint16_t elen;
     uint16_t cbom_blocksize;
diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index daff0b8f60..667421b0b7 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -298,7 +298,9 @@  static void riscv_cpu_validate_misa_mxl(RISCVCPU *cpu, Error **errp)
 static void riscv_cpu_validate_v(CPURISCVState *env, RISCVCPUConfig *cfg,
                                  Error **errp)
 {
-    if (cfg->vlen > RV_VLEN_MAX || cfg->vlen < 128) {
+    uint32_t vlen = cfg->vlenb << 3;
+
+    if (vlen > RV_VLEN_MAX || vlen < 128) {
         error_setg(errp,
                    "Vector extension implementation only supports VLEN "
                    "in the range [128, %d]", RV_VLEN_MAX);