[PATCH] x86: Add -march=cascadelake

[Wei Xiao]

Thanks for the comments!
Fixed as attached.
Ok for trunk?
Jakub Jelinek <jakub@redhat.com> 于2018年12月14日周五 下午6:47写道：
>
> On Fri, Dec 14, 2018 at 06:33:37PM +0800, Wei Xiao wrote:
> --- a/gcc/config/i386/driver-i386.c
> +++ b/gcc/config/i386/driver-i386.c
> @@ -832,8 +832,16 @@ const char *host_detect_local_cpu (int argc, const char **argv)
>           cpu = "skylake";
>           break;
>         case 0x55:
> -         /* Skylake with AVX-512.  */
> -         cpu = "skylake-avx512";
> +         if (has_avx512vnni)
> +         {
> +           /* Cascade Lake.  */
> +           cpu = "cascadelake";
> +         }
> +         else
> +         {
> +           /* Skylake with AVX-512.  */
> +           cpu = "skylake-avx512";
> +         }
>           break;
>
> Just a formatting nit here, if {}s are used, they should be indented
> 2 columns to the right from the if or else and the body of {} should
> be indented by two further columns over {.
> But, in this case, there is another rule, that if the body has a single
> statement, then there shouldn't be {}s around it.  Thus just:
>           if (has_avx512vnni)
>             /* Cascade Lake.  */
>             cpu = "cascadelake";
>           else
>             /* Skylake with AVX-512.  */
>             cpu = "skylake-avx512";
>
>         Jakub
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