Re: [PATCH 2/4] target/ppc: Hoist dcbz_size out of dcbz_common

[Nicholas Piggin]

On Wed Jul 3, 2024 at 9:46 AM AEST, Richard Henderson wrote:
> The 970 logic does not apply to dcbzep, which is an e500 insn.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

> ---
>  target/ppc/mem_helper.c | 30 +++++++++++++++---------------
>  1 file changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c
> index 361fd72226..5067919ff8 100644
> --- a/target/ppc/mem_helper.c
> +++ b/target/ppc/mem_helper.c
> @@ -271,22 +271,12 @@ void helper_stsw(CPUPPCState *env, target_ulong addr, 
> uint32_t nb,
>  }
>  
>  static void dcbz_common(CPUPPCState *env, target_ulong addr,
> -                        uint32_t opcode, int mmu_idx, uintptr_t retaddr)
> +                        int dcbz_size, int mmu_idx, uintptr_t retaddr)
>  {
> -    target_ulong mask, dcbz_size = env->dcache_line_size;
> -    uint32_t i;
> +    target_ulong mask = ~(target_ulong)(dcbz_size - 1);
>      void *haddr;
>  
> -#if defined(TARGET_PPC64)
> -    /* Check for dcbz vs dcbzl on 970 */
> -    if (env->excp_model == POWERPC_EXCP_970 &&
> -        !(opcode & 0x00200000) && ((env->spr[SPR_970_HID5] >> 7) & 0x3) == 
> 1) {
> -        dcbz_size = 32;
> -    }
> -#endif
> -
>      /* Align address */
> -    mask = ~(dcbz_size - 1);
>      addr &= mask;
>  
>      /* Check reservation */
> @@ -300,7 +290,7 @@ static void dcbz_common(CPUPPCState *env, target_ulong 
> addr,
>          memset(haddr, 0, dcbz_size);
>      } else {
>          /* Slow path */
> -        for (i = 0; i < dcbz_size; i += 8) {
> +        for (int i = 0; i < dcbz_size; i += 8) {
>              cpu_stq_mmuidx_ra(env, addr + i, 0, mmu_idx, retaddr);
>          }
>      }
> @@ -308,12 +298,22 @@ static void dcbz_common(CPUPPCState *env, target_ulong 
> addr,
>  
>  void helper_dcbz(CPUPPCState *env, target_ulong addr, uint32_t opcode)
>  {
> -    dcbz_common(env, addr, opcode, ppc_env_mmu_index(env, false), GETPC());
> +    int dcbz_size = env->dcache_line_size;
> +
> +#if defined(TARGET_PPC64)
> +    /* Check for dcbz vs dcbzl on 970 */
> +    if (env->excp_model == POWERPC_EXCP_970 &&
> +        !(opcode & 0x00200000) && ((env->spr[SPR_970_HID5] >> 7) & 0x3) == 
> 1) {
> +        dcbz_size = 32;
> +    }
> +#endif
> +
> +    dcbz_common(env, addr, dcbz_size, ppc_env_mmu_index(env, false), 
> GETPC());
>  }
>  
>  void helper_dcbzep(CPUPPCState *env, target_ulong addr, uint32_t opcode)
>  {
> -    dcbz_common(env, addr, opcode, PPC_TLB_EPID_STORE, GETPC());
> +    dcbz_common(env, addr, env->dcache_line_size, PPC_TLB_EPID_STORE, 
> GETPC());
>  }
>  
>  void helper_icbi(CPUPPCState *env, target_ulong addr)