From: Pat Haugen <pthaugen@us.ibm.com>
Date: Tue, 16 Apr 2019 15:58:02 +0000 (+0000)
Subject: re PR target/84369 (test case gcc.dg/sms-10.c fails on power9)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=590df85d1ce9d80e5e628a44a8d7fa03bf02a09c;p=gcc.git

re PR target/84369 (test case gcc.dg/sms-10.c fails on power9)

	PR target/84369
	* config/rs6000/power9.md: Add store forwarding bypass.

From-SVN: r270394
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5f007efe75e..437159728a2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-04-16  Pat Haugen  <pthaugen@us.ibm.com>
+
+	PR target/84369
+	* config/rs6000/power9.md: Add store forwarding bypass.
+
 2019-04-16  Alexandre Oliva <aoliva@redhat.com>
 
 	PR debug/89528
diff --git a/gcc/config/rs6000/power9.md b/gcc/config/rs6000/power9.md
index 8e62d1046c1..aa42ae3d0d5 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"))