From: bergner <bergner@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 12 Oct 2018 16:31:11 +0000 (+0000)
Subject: 	PR rtl-optimization/87600
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3a18b2f8b7f3824ed27099ae8a7de9ddcc8c571e;p=thirdparty%2Fgcc.git

	PR rtl-optimization/87600
	* ira-lives (non_conflicting_reg_copy_p): Disable for non LRA targets.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@265113 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 239336756187..ac0106144596 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2018-10-12  Peter Bergner  <bergner@linux.ibm.com>
+
+	PR rtl-optimization/87600
+	* ira-lives (non_conflicting_reg_copy_p): Disable for non LRA targets.
+
 2018-10-12  Paul Koning  <ni1d@arrl.net>
 
 	* doc/md.texi (doloop_end): Document that the pattern code may
diff --git a/gcc/ira-lives.c b/gcc/ira-lives.c
index dd8b334d58ec..c5e85b91f48e 100644
--- a/gcc/ira-lives.c
+++ b/gcc/ira-lives.c
@@ -1064,6 +1064,11 @@ find_call_crossed_cheap_reg (rtx_insn *insn)
 rtx
 non_conflicting_reg_copy_p (rtx_insn *insn)
 {
+  /* Reload has issues with overlapping pseudos being assigned to the
+     same hard register, so don't allow it.  See PR87600 for details.  */
+  if (!targetm.lra_p ())
+    return NULL_RTX;
+
   rtx set = single_set (insn);
 
   /* Disallow anything other than a simple register to register copy