From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Mon, 5 Mar 2018 19:11:54 +0000 (+0100)
Subject: rs6000: Don't align tiny loops to 32 bytes for POWER9
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=34b01e681ea99cfeef9dbb69fbb1f9fb1dc3a088;p=gcc.git

rs6000: Don't align tiny loops to 32 bytes for POWER9

For POWER4..POWER8 we align loops of 5..8 instructions to 32 bytes
(instead of to 16 bytes) because that executes faster.  This is no
longer the case on POWER9, so we can just as well only align to 16
bytes.


	* config/rs6000/rs6000.c (rs6000_loop_align): Don't align tiny loops
	to 32 bytes when compiling for POWER9.

From-SVN: r258260
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1d1ef6e850e..5630a84a949 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2018-03-05  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.c (rs6000_loop_align): Don't align tiny loops
+	to 32 bytes when compiling for POWER9.
+
 2018-03-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/84564
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index d0de4b5224d..5f22b6de5bb 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -5333,8 +5333,7 @@ rs6000_loop_align (rtx label)
 	  || rs6000_tune == PROCESSOR_POWER5
 	  || rs6000_tune == PROCESSOR_POWER6
 	  || rs6000_tune == PROCESSOR_POWER7
-	  || rs6000_tune == PROCESSOR_POWER8
-	  || rs6000_tune == PROCESSOR_POWER9))
+	  || rs6000_tune == PROCESSOR_POWER8))
     return 5;
   else
     return align_loops_log;