From: Xionghu Luo <luoxhu@linux.ibm.com>
Date: Thu, 25 Mar 2021 00:46:12 +0000 (-0500)
Subject: rs6000: Correct Power8 cost of l2 cache size [PR97329]
X-Git-Tag: basepoints/gcc-12~436
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=08103e4d6ada9b57366f2df2a2b745babfab914c;p=thirdparty%2Fgcc.git

rs6000: Correct Power8 cost of l2 cache size [PR97329]

l2 cache size for Power8 is 512kB, it was copied from Power7 before
public.  Tested no performance change for SPEC2017.

gcc/ChangeLog:

2021-03-24  Xionghu Luo  <luoxhu@linux.ibm.com>

	* config/rs6000/rs6000.c (power8_costs): Change l2 cache
	from 256 to 512.
---

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 616dae35bae1..34c4edae20ea 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1055,7 +1055,7 @@ struct processor_costs power8_cost = {
   COSTS_N_INSNS (17),	/* ddiv */
   128,			/* cache line size */
   32,			/* l1 cache */
-  256,			/* l2 cache */
+  512,			/* l2 cache */
   12,			/* prefetch streams */
   COSTS_N_INSNS (3),	/* SF->DF convert */
 };