From: Bernd Schmidt <bernds@redhat.co.uk>
Date: Thu, 30 Nov 2000 11:59:43 +0000 (+0000)
Subject: Backport a change to the 2.95 branch
X-Git-Tag: prereleases/gcc-2.95.3-test1~55
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=557d61401995934a806268dbd5e850ef1ed992f8;p=thirdparty%2Fgcc.git

Backport a change to the 2.95 branch

From-SVN: r37878
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6bfed8719ff6..9c60312f0f8c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2000-11-30  Bernd Schmidt  <bernds@redhat.co.uk>
 
+	Thu Apr 13 19:39:56 2000  Clinton Popetz  <cpopetz@cygnus.com>
+	* emit-rtl.c (try_split): Avoid infinite loop if the split
+	results in a sequence that contains the original insn.
+
 	1999-12-14  Bernd Schmidt  <bernds@cygnus.co.uk>
 	* combine.c (combine_simplify_rtx): Don't make shared rtl.
 	(simplify_logical): Likewise.
diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 36b030ae7b6b..222a1a937f09 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -2359,10 +2359,18 @@ try_split (pat, trial, last)
 	 it, in turn, will be split (SFmode on the 29k is an example).  */
       if (GET_CODE (seq) == SEQUENCE)
 	{
+	  int i;
+
+	  /* Avoid infinite loop if any insn of the result matches 
+	     the original pattern.  */
+	  for (i = 0; i < XVECLEN (seq, 0); i++)
+  	    if (GET_CODE (XVECEXP (seq, 0, i)) == INSN 
+		&& rtx_equal_p (PATTERN (XVECEXP (seq, 0, i)), pat))
+  	      return trial;
+
 	  /* If we are splitting a JUMP_INSN, look for the JUMP_INSN in
 	     SEQ and copy our JUMP_LABEL to it.  If JUMP_LABEL is non-zero,
 	     increment the usage count so we don't delete the label.  */
-	  int i;
 
 	  if (GET_CODE (trial) == JUMP_INSN)
 	    for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)