re PR target/11229 (pure-1.c fails on powerpc64-linux with -O1)

	PR target/11229
	* cse.c (cse_insn): Set classp using src_const_elt if
	src_eqv_elt is NULL.

From-SVN: r74225

gcc/ChangeLog

+2003-12-03  Alan Modra  <amodra@bigpond.net.au>
+
+	PR target/11229
+	* cse.c (cse_insn): Set classp using src_const_elt if
+	src_eqv_elt is NULL.
+
 2003-12-03  Richard Earnshaw  <rearnsha@arm.com>
 
 	* gcse.c (reg_clear_last_set): New function.

gcc/cse.c

@@ -5827,6 +5827,16 @@ cse_insn (rtx insn, rtx libcall_insn)
 	    enum machine_mode mode
 	      = GET_MODE (src) == VOIDmode ? GET_MODE (dest) : GET_MODE (src);
 
+	    /* It's possible that we have a source value known to be
+	       constant but don't have a REG_EQUAL note on the insn.
+	       Lack of a note will mean src_eqv_elt will be NULL.  This
+	       can happen where we've generated a SUBREG to access a
+	       CONST_INT that is already in a register in a wider mode.
+	       Ensure that the source expression is put in the proper
+	       constant class.  */
+	    if (!classp)
+	      classp = sets[i].src_const_elt;
+
 	    if (sets[i].src_elt == 0)
 	      {
 		/* Don't put a hard register source into the table if this is