From: Alan Modra <amodra@gmail.com>
Date: Fri, 25 Aug 2017 12:21:00 +0000 (+0930)
Subject: PR81747, ICE in operator[]
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e2da9ffe3c90b3a460b5fbbea7ee3aa7941882d1;p=gcc.git

PR81747, ICE in operator[]

	PR rtl-optimization/81747
	* cse.c (cse_extended_basic_block): Don't attempt to record
	equivalences for degenerate conditional branches that branch
	to their fall-through.

From-SVN: r251349
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4f2350a2cc6..7d03c8a2498 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2017-08-25  Alan Modra  <amodra@gmail.com>
+
+	PR rtl-optimization/81747
+	* cse.c (cse_extended_basic_block): Don't attempt to record
+	equivalences for degenerate conditional branches that branch
+	to their fall-through.
+
 2017-08-24  Martin Sebor  <msebor@redhat.com>
 
 	PR middle-end/81908
diff --git a/gcc/cse.c b/gcc/cse.c
index dfcebbfbc02..191fd0699fb 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -6640,6 +6640,7 @@ cse_extended_basic_block (struct cse_basic_block_data *ebb_data)
 	 equivalences due to the condition being tested.  */
       insn = BB_END (bb);
       if (path_entry < path_size - 1
+	  && EDGE_COUNT (bb->succs) == 2
 	  && JUMP_P (insn)
 	  && single_set (insn)
 	  && any_condjump_p (insn))