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From: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
In-reply-to: <20181218014707.GA10098@flamenco>
Date: Tue, 18 Dec 2018 14:38:15 +0000
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Subject: Re: [Qemu-devel] [PULL v3 08/15] tests/fp: add fp-bench
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To: "Emilio G. Cota" <cota@braap.org>
Cc: peter.maydell@linaro.org, qemu-devel@nongnu.org, Aurelien Jarno <aurelien@aurel32.net>


Emilio G. Cota <cota@braap.org> writes:

> On Mon, Dec 17, 2018 at 10:56:43 +0000, Alex Benn=C3=A9e wrote:
>> From: "Emilio G. Cota" <cota@braap.org>
>> +static void update_random_ops(int n_ops, enum precision prec)
>> +{
>> +    int i;
>> +
>> +    for (i =3D 0; i < n_ops; i++) {
>> +        uint64_t r =3D random_ops[i];
>> +
>> +        if (prec =3D=3D PREC_SINGLE || PREC_FLOAT32) {
>> +            do {
>> +                r =3D xorshift64star(r);
>> +            } while (!float32_is_normal(r));
>> +        } else if (prec =3D=3D PREC_DOUBLE || PREC_FLOAT64) {
>
> I just noticed that there's a bug here (I was seeing non-normals
> where I didn't expect any):
>
>      for (i =3D 0; i < n_ops; i++) {
>          uint64_t r =3D random_ops[i];
>
> -        if (prec =3D=3D PREC_SINGLE || PREC_FLOAT32) {
> +        if (prec =3D=3D PREC_SINGLE || prec =3D=3D PREC_FLOAT32) {
>              do {
>                  r =3D xorshift64star(r);
>              } while (!float32_is_normal(r));
> -        } else if (prec =3D=3D PREC_DOUBLE || PREC_FLOAT64) {
> +        } else if (prec =3D=3D PREC_DOUBLE || prec =3D=3D PREC_FLOAT64) {
>              do {
>                  r =3D xorshift64star(r);
>              } while (!float64_is_normal(r));
>
> Let me know if you want me to send a proper patch (this is non-critical
> so it's OK to fix after merging) or you'd rather fix it up directly.

I spoke too soon - it got merged today. If you can send a proper patch
I'll add it to my queue.

--
Alex Benn=C3=A9e