cfgloopanal.c (variable_initial_value, [...]): Record the fact that initial…

cfgloopanal.c (variable_initial_value, [...]): Record the fact that initial value is extended from inner mode.

	* cfgloopanal.c (variable_initial_value, variable_initial_values,
	simple_loop_exit_p): Record the fact that initial value is extended
	from inner mode.
	(count_strange_loop_iterations, count_loop_iterations): Handle
	ivs that iterate in a narrower mode. Fix handling of overflows.
	Improve handling of NE conditions.
	(inverse, fits_in_mode_p): New static functions.
	(simple_increment): Detect variables that iterate in a narrower mode.
	* cfgloop.h (struct loop_desc): Fields inner_mode and extend added.

From-SVN: r73275

gcc/ChangeLog

+2003-11-05  Zdenek Dvorak  <rakdver@atrey.karlin.mff.cuni.cz>
+
+	* cfgloopanal.c (variable_initial_value, variable_initial_values,
+	simple_loop_exit_p): Record the fact that initial value is extended
+	from inner mode.
+	(count_strange_loop_iterations, count_loop_iterations): Handle
+	ivs that iterate in a narrower mode. Fix handling of overflows.
+	Improve handling of NE conditions.
+	(inverse, fits_in_mode_p): New static functions.
+	(simple_increment): Detect variables that iterate in a narrower mode.
+	* cfgloop.h (struct loop_desc): Fields inner_mode and extend added.
+
 2003-11-05  Geoffrey Keating  <geoffk@apple.com>
 
 	* config/rs6000/darwin.h (SUBTARGET_OVERRIDE_OPTIONS): Darwin

gcc/cfgloop.h

@@ -42,6 +42,9 @@ struct loop_desc
   int postincr;		/* 1 if increment/decrement is done after loop exit condition.  */
   rtx stride;		/* Value added to VAR in each iteration.  */
   rtx var;		/* Loop control variable.  */
+  enum machine_mode inner_mode;
+			/* The mode from that it is extended.  */
+  enum rtx_code extend;	/* With this extend.  */
   rtx var_alts;		/* List of definitions of its initial value.  */
   rtx lim;		/* Expression var is compared with.  */
   rtx lim_alts;		/* List of definitions of its initial value.  */