diff mbox series

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

Message ID 40ce46df2d6187493520bcd9d07141cc26f50638.1520250209.git.segher@kernel.crashing.org
State New
Headers show
Series rs6000: Don't align tiny loops to 32 bytes for POWER9 | expand

Commit Message

Segher Boessenkool March 5, 2018, 7:10 p.m. UTC 
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.

Bootstrapped and tested on a p9 powerpc64le-linux.  Committing to trunk.


Segher


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.

---
 gcc/config/rs6000/rs6000.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index dbc1d79..5cc116f 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -5285,8 +5285,7 @@  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;