Re: [PATCH v2 19/37] target/sparc: Implement FPCMPEQ8, FPCMPNE8, FPCMPULE8, FPCMPUGT8

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

On 26/5/24 21:42, Richard Henderson wrote:
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   target/sparc/helper.h     |  4 ++++
>   target/sparc/insns.decode |  5 +++++
>   target/sparc/translate.c  |  9 +++++++++
>   target/sparc/vis_helper.c | 40 +++++++++++++++++++++++++++++++++++++++
>   4 files changed, 58 insertions(+)


> +uint64_t helper_fcmpeq8(uint64_t src1, uint64_t src2)
> +{
> +    uint64_t a = src1 ^ src2;
> +    uint64_t m = 0x7f7f7f7f7f7f7f7fULL;
> +    uint64_t c = ~(((a & m) + m) | a | m);
> +
> +    /* a.......b.......c.......d.......e.......f.......g.......h....... */
> +    c |= c << 7;
> +    /* ab......bc......cd......de......ef......fg......gh......h....... */
> +    c |= c << 14;
> +    /* abcd....bcde....cdef....defg....efgh....fgh.....gh......h....... */
> +    c |= c << 28;
> +    /* abcdefghbcdefgh.cdefgh..defgh...efgh....fgh.....gh......h....... */
> +    return c >> 56;
> +}

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>