From: Richard Stallman <rms@gnu.org>
Date: Mon, 11 Oct 1993 19:55:18 +0000 (+0000)
Subject: (reg_scan_mark_refs): XEXP (x, 0) in EXPR_LIST may be 0.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7b18c3db9c48b2ac5306e9ca9b4a7329c2f09b67;p=gcc.git

(reg_scan_mark_refs): XEXP (x, 0) in EXPR_LIST may be 0.

From-SVN: r5739
---

diff --git a/gcc/regclass.c b/gcc/regclass.c
index 6702144828c..3a488fc1a00 100644
--- a/gcc/regclass.c
+++ b/gcc/regclass.c
@@ -1584,7 +1584,8 @@ reg_scan_mark_refs (x, insn, note_flag)
       break;
 
     case EXPR_LIST:
-      reg_scan_mark_refs (XEXP (x, 0), insn, note_flag);
+      if (XEXP (x, 0))
+	reg_scan_mark_refs (XEXP (x, 0), insn, note_flag);
       if (XEXP (x, 1))
 	reg_scan_mark_refs (XEXP (x, 1), insn, note_flag);
       break;