[GCC 10] aarch64: Set AARCH64_EXTRA_TUNE_PREFER_ADVSIMD_AUTOVEC for Neoverse N2

[GCC 10] aarch64: Set AARCH64_EXTRA_TUNE_PREFER_ADVSIMD_AUTOVEC for Neoverse N2

[Kyrylo Tkachov]

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Hi all,

This patch tweaks the Neoverse N2 tuning on the GCC 10 branch to have it in line with GCC 8 and 9 to prefer AdvancedSIMD over SVE for auto-vectorisation.

Bootstrapped and tested on aarch64-none-linux-gnu.
Pushing to the branch.

Thanks,
Kyrill

gcc/ChangeLog:

	* config/aarch64/aarch64.c (neoversen2_tunings): Set
	AARCH64_EXTRA_TUNE_PREFER_ADVSIMD_AUTOVEC tune_flags.

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diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 775f79d88ff8e07a32b9ce44b4afcc5cbee5a1db..5bd5c458ae0428bd177e1f30c2f4c5b687d98752 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -1430,7 +1430,7 @@ static const struct tune_params neoversen2_tunings =
   2,	/* min_div_recip_mul_df.  */
   0,	/* max_case_values.  */
   tune_params::AUTOPREFETCHER_WEAK,	/* autoprefetcher_model.  */
-  (AARCH64_EXTRA_TUNE_NONE),	/* tune_flags.  */
+  (AARCH64_EXTRA_TUNE_PREFER_ADVSIMD_AUTOVEC),	/* tune_flags.  */
   &generic_prefetch_tune
 };