[PATCH] AArch64: Use correct cost for shifted halfword load/stores

[Wilco Dijkstra]

Since all Armv9 cores support shifted LDRH/STRH, use the correct cost of zero
for these.

Passes regress, OK for commit?

gcc:
        * config/aarch64/tuning_models/generic_armv9_a.h
        (generic_armv9_a_addrcost_table): Use zero cost for himode.

---

diff --git a/gcc/config/aarch64/tuning_models/generic_armv9_a.h 
b/gcc/config/aarch64/tuning_models/generic_armv9_a.h
index 
f76a2506f3841a05a89285e50ad96c8665732955..9eb1a20d3c4e5d5a3b6c8bf8a2c341a82ac8f7da
 100644
--- a/gcc/config/aarch64/tuning_models/generic_armv9_a.h
+++ b/gcc/config/aarch64/tuning_models/generic_armv9_a.h
@@ -26,7 +26,7 @@
 static const struct cpu_addrcost_table generic_armv9_a_addrcost_table =
 {
     {
-      1, /* hi  */
+      0, /* hi  */
       0, /* si  */
       0, /* di  */
       1, /* ti  */