emit-rtl.c (try_split): Avoid infinite loop if the split results in a sequence that contains the...

	* emit-rtl.c (try_split): Avoid infinite loop if the split
	results in a sequence that contains the original insn.

From-SVN: r33143

gcc/ChangeLog

+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.                  
+
 2000-04-13  Andreas Jaeger  <aj@suse.de>
 
 	* config/mips/mips.c (expand_block_move): Pass alignment

gcc/emit-rtl.c

@@ -2336,10 +2336,18 @@ 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--)