Backport from mainline:
2019-04-16 Pat Haugen <pthaugen@us.ibm.com>
PR target/84369
* config/rs6000/power9.md: Add store forwarding bypass.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-8-branch@270461 138bc75d-0d04-0410-961f-82ee72b054a4
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f9d0cbe..ecdd9c8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2019-04-19 Pat Haugen <pthaugen@us.ibm.com>
+
+ Backport from mainline:
+ 2019-04-16 Pat Haugen <pthaugen@us.ibm.com>
+
+ PR target/84369
+ * config/rs6000/power9.md: Add store forwarding bypass.
+
2019-04-17 Martin Jambor <mjambor@suse.cz>
Backport from mainline
diff --git a/gcc/config/rs6000/power9.md b/gcc/config/rs6000/power9.md
index 79ebbe4..cc4a329 100644
--- a/gcc/config/rs6000/power9.md
+++ b/gcc/config/rs6000/power9.md
@@ -236,6 +236,9 @@
(eq_attr "cpu" "power9"))
"DU_super_power9,LSU_pair_power9")
+; Store forwarding latency is 6
+(define_bypass 6 "power9-*store*" "power9-*load*")
+
(define_insn_reservation "power9-larx" 4
(and (eq_attr "type" "load_l")
(eq_attr "cpu" "power9"))
