From: Bill Schmidt <wschmidt@linux.ibm.com>
Date: Thu, 21 Mar 2019 17:13:55 +0000 (+0000)
Subject: rs6000.c (rs6000_analyze_swaps): Rebuild ud- and du-chains between phases.
X-Git-Tag: releases/gcc-7.5.0~527
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=726bf18a0f26af3e9aa80bec5464dcc5340457a2;p=thirdparty%2Fgcc.git

rs6000.c (rs6000_analyze_swaps): Rebuild ud- and du-chains between phases.

2019-03-21  Bill Schmidt  <wschmidt@linux.ibm.com>

	* config/rs6000/rs6000.c (rs6000_analyze_swaps): Rebuild
	ud- and du-chains between phases.

From-SVN: r269843
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cfcf569785fd..238bdbd25116 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2019-03-21  Bill Schmidt  <wschmidt@linux.ibm.com>
+
+        * config/rs6000/rs6000.c (rs6000_analyze_swaps): Rebuild
+        ud- and du-chains between phases.
+
 2019-03-21  Matthias Klose  <doko@ubuntu.com>
 
 	Backport from mainline
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 7bfeba3ef2e4..62744b1fa903 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -43038,6 +43038,14 @@ rs6000_analyze_swaps (function *fun)
   /* Pre-pass to recombine lvx and stvx patterns so we don't lose info.  */
   recombine_lvx_stvx_patterns (fun);
 
+  /* Rebuild ud- and du-chains.  */                                            
+  df_remove_problem (df_chain);
+  df_process_deferred_rescans ();
+  df_set_flags (DF_RD_PRUNE_DEAD_DEFS);
+  df_chain_add_problem (DF_DU_CHAIN | DF_UD_CHAIN);
+  df_analyze ();
+  df_set_flags (DF_DEFER_INSN_RESCAN);
+
   /* Allocate structure to represent webs of insns.  */
   insn_entry = XCNEWVEC (swap_web_entry, get_max_uid ());