Re: [Qemu-devel] [PATCH] target/arm: Free TCG temps in trans_VMOV_64_sp()

["Alex Bennée" <alex.bennee@linaro.org>]

Aleksandar Markovic <aleksandar.m.mail@gmail.com> writes:

> 27.08.2019. 14.20, "Peter Maydell" <peter.maydell@linaro.org> је написао/ла:
>>
>> The function neon_store_reg32() doesn't free the TCG temp that it
>> is passed, so the caller must do that. We got this right in most
>> places but forgot to free the TCG temps in trans_VMOV_64_sp().
>>
>> Cc: qemu-stable@nongnu.org
>> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
>> ---
>
> Hello, Peter,
>
> I am just curious if you found this by manual code inspection, or perhaps
> using a tool?

I'm guessing that if you run code that exercises this while built with
--enable-tcg-debug then TCG's sanity checking complains about unfreed
temps.

>
> Yours,
> Aleksandar
>
>>  target/arm/translate-vfp.inc.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/target/arm/translate-vfp.inc.c
> b/target/arm/translate-vfp.inc.c
>> index 3e8ea80493b..9ae980bef63 100644
>> --- a/target/arm/translate-vfp.inc.c
>> +++ b/target/arm/translate-vfp.inc.c
>> @@ -880,8 +880,10 @@ static bool trans_VMOV_64_sp(DisasContext *s,
> arg_VMOV_64_sp *a)
>>          /* gpreg to fpreg */
>>          tmp = load_reg(s, a->rt);
>>          neon_store_reg32(tmp, a->vm);
>> +        tcg_temp_free_i32(tmp);
>>          tmp = load_reg(s, a->rt2);
>>          neon_store_reg32(tmp, a->vm + 1);
>> +        tcg_temp_free_i32(tmp);
>>      }
>>
>>      return true;
>> --
>> 2.20.1
>>
>>


--
Alex Bennée