[AArch64] Increase default function alignment

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.

    gcc/
	* config/aarch64/aarch64.c (generic_tunings): Set function alignment to
	16:12.

From-SVN: r274374

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3e05090eba1a3d47ad2d5b6a4da070927d30729d..004d270bab78c9dfdbf76e22a28a766687d63317 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-08-13  Wilco Dijkstra  <wdijkstr@arm.com>
+
+       * config/aarch64/aarch64.c (generic_tunings): Set function alignment to
+       16:12.
+
 2019-08-13  Jozef Lawrynowicz  <jozef.l@mittosystems.com>
 
        * config/msp430/driver-msp430.c (msp430_set_driver_var): New.

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 291cbb2696d2c166766d3fd443b9ab5055666b48..af4d8afaa5a58adbd6d17f87732bbf7028934f0b 100644 (file)
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -712,7 +712,7 @@ 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.  */