From: Wilco Dijkstra <wdijkstr@arm.com>
Date: Tue, 13 Aug 2019 10:39:22 +0000 (+0000)
Subject: [AArch64] Increase default function alignment
X-Git-Tag: misc/cutover-git~3476
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e55aefa3ee19167a41892e4920a3e8c520aee42;p=thirdparty%2Fgcc.git

[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 3e05090eba1a..004d270bab78 100644
--- 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 291cbb2696d2..af4d8afaa5a5 100644
--- 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.  */