Re: [PATCH v2 4/4] target/loongarch: flogb_{s/d} add set float_flag_divbyzero

[gaosong]

在 2022/9/28 下午11:24, Richard Henderson 写道:
> On 9/26/22 23:48, Song Gao wrote:
> > if fj ==0 or fj == INT32_MIN/INT64_MIN, LoongArch host set fcsr cause 
> > exception FP_DIV0,
> > So we need set exception flags float_flagdivbyzero if fj ==0.
>
> You are correct that ieee754 says that logB(0) should raise divbyzero.
> This should be fixed in softfloat-parts.c.inc, not here, within
>
>         case float_class_zero:
>
>             /* log2(0) = -inf */
>
>             a->cls = float_class_inf;
>
>             a->sign = 1;
>
>             return;
Ok , I will correct it on v3.

Thanks.
Song Gao
> r~