[PATCH] AArch64: Enable fast shifts on Neoverse V1/N2

[Wilco Dijkstra via Gcc-patches]

Enable the fast shift feature in Neoverse V1 and N2 tunings as well.

ChangeLog:
2021-10-18  Wilco Dijkstra  <wdijk...@arm.com>

        * config/aarch64/aarch64.c (neoversev1_tunings):
        Enable AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND.
        (neoversen2_tunings): Likewise.

---

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 
c7b76a7cdeea0539cd73f7987d1a4354d0a40624..e65afe39047359a3279ae6b2047a3e9a04e6c2a9
 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -1832,7 +1832,8 @@ static const struct tune_params neoversev1_tunings =
   tune_params::AUTOPREFETCHER_WEAK,    /* autoprefetcher_model.  */
   (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
    | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
-   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT),    /* tune_flags.  */
+   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
+   | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND),   /* tune_flags.  */
   &generic_prefetch_tune
 };
 
@@ -1858,7 +1859,7 @@ 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_CHEAP_SHIFT_EXTEND),     /* tune_flags.  */
   &generic_prefetch_tune
 };