From: Richard Stallman <rms@gnu.org>
Date: Mon, 28 Jun 1993 00:41:41 +0000 (+0000)
Subject: (copy_rtx_if_shared): Don't try to copy a 0-length vector.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f0722107141402b371e6041279b43e93b328562c;p=gcc.git

(copy_rtx_if_shared): Don't try to copy a 0-length vector.

From-SVN: r4774
---

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index b63f0c8b479..29273b13273 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -1418,12 +1418,12 @@ copy_rtx_if_shared (orig)
 	  if (XVEC (x, i) != NULL)
 	    {
 	      register int j;
+	      int len = XVECLEN (x, i);
 
-	      if (copied)
-		XVEC (x, i) = gen_rtvec_v (XVECLEN (x, i), &XVECEXP (x, i, 0));
-	      for (j = 0; j < XVECLEN (x, i); j++)
-		XVECEXP (x, i, j)
-		  = copy_rtx_if_shared (XVECEXP (x, i, j));
+	      if (copied && len > 0)
+		XVEC (x, i) = gen_rtvec_v (len, &XVECEXP (x, i, 0));
+	      for (j = 0; j < len; j++)
+		XVECEXP (x, i, j) = copy_rtx_if_shared (XVECEXP (x, i, j));
 	    }
 	  break;
 	}