With -mcpu=generic the function alignment is currently 8, however almost all
supported cores prefer 16 or higher, so increase the default to 16:12.
This gives ~0.2% performance increase on SPECINT2017, while codesize is 0.12%
larger.
ChangeLog:
2019-05-31 Wilco Dijkstra <wdijk...@arm.com>
* config/aarch64/aarch64.c (generic_tunings): Set function alignment to
16.
--
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index
0023cb37bbae5afe9387840c1bb6b43586d4fac2..ed1422af6aab5e3c6eeea37ec57e69b64092a0ab
100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -693,7 +693,7 @@ static const struct tune_params generic_tunings =
4, /* memmov_cost */
2, /* issue_rate */
(AARCH64_FUSE_AES_AESMC), /* fusible_ops */
- "8", /* function_align. */
+ "16:12", /* function_align. */
"4", /* jump_align. */
"8", /* loop_align. */
2, /* int_reassoc_width. */
