From: Peter Bergner <bergner@linux.ibm.com>
Date: Fri, 12 Oct 2018 16:31:11 +0000 (+0000)
Subject: re PR rtl-optimization/87600 (Fix for PRs 86939 and 87479 causes build issues for... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d8d3cc098eda75481a13d66f6e04fadffc5cecff;p=gcc.git

re PR rtl-optimization/87600 (Fix for PRs 86939 and 87479 causes build issues for several targets)

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

From-SVN: r265113
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 23933675618..ac010614459 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 dd8b334d58e..c5e85b91f48 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