Re: [PATCH v1 1/3] target/microblaze: Plug temp leaks for loads/stores

[Luc Michel]

On 11/6/19 3:14 PM, Edgar E. Iglesias wrote:
> From: "Edgar E. Iglesias" <address@hidden>
> 
> Plug TCG temp leaks for loads/stores.
> 
> Signed-off-by: Edgar E. Iglesias <address@hidden>
> ---
>  target/microblaze/translate.c | 30 ++++++++++++++++++++++++------
>  1 file changed, 24 insertions(+), 6 deletions(-)
> 
> diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c
> index 761f535357..ba143ede5f 100644
> --- a/target/microblaze/translate.c
> +++ b/target/microblaze/translate.c
> @@ -967,12 +967,14 @@ static void dec_load(DisasContext *dc)
>                     10 -> 10
>                     11 -> 00 */
>                  TCGv low = tcg_temp_new();
> +                TCGv t3 = tcg_const_tl(3);
>  
>                  tcg_gen_andi_tl(low, addr, 3);
> -                tcg_gen_sub_tl(low, tcg_const_tl(3), low);
> +                tcg_gen_sub_tl(low, t3, low);
For this one, I think you can use tcg_gen_subfi_tl(low, 3, low)
>                  tcg_gen_andi_tl(addr, addr, ~3);
>                  tcg_gen_or_tl(addr, addr, low);
>                  tcg_temp_free(low);
> +                tcg_temp_free(t3);
>                  break;
>              }
>  
> @@ -1006,9 +1008,16 @@ static void dec_load(DisasContext *dc)
>      tcg_gen_qemu_ld_i32(v, addr, mem_index, mop);
>  
>      if ((dc->cpu->env.pvr.regs[2] & PVR2_UNALIGNED_EXC_MASK) && size > 1) {
> +        TCGv_i32 t0 = tcg_const_i32(0);
> +        TCGv_i32 treg = tcg_const_i32(dc->rd);
> +        TCGv_i32 tsize = tcg_const_i32(size - 1);
> +
>          tcg_gen_movi_i64(cpu_SR[SR_PC], dc->pc);
> -        gen_helper_memalign(cpu_env, addr, tcg_const_i32(dc->rd),
> -                            tcg_const_i32(0), tcg_const_i32(size - 1));
> +        gen_helper_memalign(cpu_env, addr, treg, t0, tsize);
> +
> +        tcg_temp_free_i32(t0);
> +        tcg_temp_free_i32(treg);
> +        tcg_temp_free_i32(tsize);
>      }
>  
>      if (ex) {
> @@ -1100,12 +1109,14 @@ static void dec_store(DisasContext *dc)
>                     10 -> 10
>                     11 -> 00 */
>                  TCGv low = tcg_temp_new();
> +                TCGv t3 = tcg_const_tl(3);
>  
>                  tcg_gen_andi_tl(low, addr, 3);
> -                tcg_gen_sub_tl(low, tcg_const_tl(3), low);
> +                tcg_gen_sub_tl(low, t3, low);
Same here.

With or without those modifications:
Reviewed-by: Luc Michel <address@hidden>

>                  tcg_gen_andi_tl(addr, addr, ~3);
>                  tcg_gen_or_tl(addr, addr, low);
>                  tcg_temp_free(low);
> +                tcg_temp_free(t3);
>                  break;
>              }
>  
> @@ -1124,6 +1135,10 @@ static void dec_store(DisasContext *dc)
>  
>      /* Verify alignment if needed.  */
>      if ((dc->cpu->env.pvr.regs[2] & PVR2_UNALIGNED_EXC_MASK) && size > 1) {
> +        TCGv_i32 t1 = tcg_const_i32(1);
> +        TCGv_i32 treg = tcg_const_i32(dc->rd);
> +        TCGv_i32 tsize = tcg_const_i32(size - 1);
> +
>          tcg_gen_movi_i64(cpu_SR[SR_PC], dc->pc);
>          /* FIXME: if the alignment is wrong, we should restore the value
>           *        in memory. One possible way to achieve this is to probe
> @@ -1131,8 +1146,11 @@ static void dec_store(DisasContext *dc)
>           *        the alignment checks in between the probe and the mem
>           *        access.
>           */
> -        gen_helper_memalign(cpu_env, addr, tcg_const_i32(dc->rd),
> -                            tcg_const_i32(1), tcg_const_i32(size - 1));
> +        gen_helper_memalign(cpu_env, addr, treg, t1, tsize);
> +
> +        tcg_temp_free_i32(t1);
> +        tcg_temp_free_i32(treg);
> +        tcg_temp_free_i32(tsize);
>      }
>  
>      if (ex) {
>