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 5f007efe75ef820cd2ea70f58218c052ccb29857..437159728a234420c3a3d13d43b03329778e8c29 100644 (file)
--- 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 8e62d1046c1699e390ba241cf3b52da32c8f2fcd..aa42ae3d0d542d1e9be18d22c7c7d8b704a61710 100644 (file)
--- 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"))