* loop.c (strength_reduce): Don't do biv->giv conversion on constants.

From-SVN: r27194

gcc/ChangeLog

+Thu May 27 02:40:48 1999  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+	* loop.c (strength_reduce): Don't do biv->giv conversion on constants.
+
 Thu May 27 02:09:27 1999  Jeffrey A Law  (law@cygnus.com)
 
 	* reload.c (push_reload): Do not call remove_address_replacements

gcc/loop.c

@@ -4193,6 +4193,8 @@ strength_reduce (scan_start, end, loop_top, insn_count,
 		  || ! next->always_executed
 		  || next->maybe_multiple
 		  || ! CONSTANT_P (next->add_val)
+		  || v->mult_val != const1_rtx
+		  || next->mult_val != const1_rtx
 		  || ! (biv_dead_after_loop
 			|| no_jumps_between_p (v->insn, next->insn)))
 		{