> -----Original Message-----
> From: Jiang, Haochen <[email protected]>
> Sent: Tuesday, October 21, 2025 2:15 PM
> To: [email protected]
> Cc: Liu, Hongtao <[email protected]>; [email protected]
> Subject: [PATCH] i386: Correct cpu codename value for unknown model
> number
>
> Hi all,
>
> There are several changes for features enabled on cpus. r16-1666 disabled
> CLDEMOTE on clients. r16-2224 removed Key locker since Panther Lake and
> Clearwater forest. r16-4436 disabled PREFETCHI on Panther Lake.
>
> The patches caused the current return guess value not aligned for
> host_detect_local_cpu meeting the unknown model number. Correct the logic
> according to the features enabled.
>
> Ok for trunk and backport to GCC14/15?
Ok.
>
> Thx,
> Haochen
>
> gcc/ChangeLog:
>
> * config/i386/driver-i386.cc (host_detect_local_cpu): Correct
> the logic for unknown model number cpu guess value.
> ---
> gcc/config/i386/driver-i386.cc | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/gcc/config/i386/driver-i386.cc b/gcc/config/i386/driver-i386.cc
> index
> fe71f550075..3eacc2cbc39 100644
> --- a/gcc/config/i386/driver-i386.cc
> +++ b/gcc/config/i386/driver-i386.cc
> @@ -639,18 +639,24 @@ const char *host_detect_local_cpu (int argc, const
> char **argv)
> }
> else if (has_feature (FEATURE_AVX))
> {
> - /* Assume Panther Lake. */
> - if (has_feature (FEATURE_PREFETCHI))
> - cpu = "pantherlake";
> /* Assume Clearwater Forest. */
> - else if (has_feature (FEATURE_USER_MSR))
> + if (has_feature (FEATURE_USER_MSR))
> cpu = "clearwaterforest";
> - /* Assume Arrow Lake S. */
> else if (has_feature (FEATURE_SM3))
> - cpu = "arrowlake-s";
> + {
> + if (has_feature (FEATURE_KL))
> + /* Assume Arrow Lake S. */
> + cpu = "arrowlake-s";
> + else
> + /* Assume Panther Lake. */
> + cpu = "pantherlake";
> + }
> /* Assume Sierra Forest. */
> - else if (has_feature (FEATURE_AVXVNNIINT8))
> + else if (has_feature (FEATURE_CLDEMOTE))
> cpu = "sierraforest";
> + /* Assume Arrow Lake. */
> + else if (has_feature (FEATURE_AVXVNNIINT8))
> + cpu = "arrowlake";
> /* Assume Alder Lake. */
> else if (has_feature (FEATURE_SERIALIZE))
> cpu = "alderlake";
> --
> 2.31.1
