tree-ssa-forwprop.c (forward_propagate_into_comparison): New function split out from ...

2011-05-30  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-forwprop.c (forward_propagate_into_comparison):
	New function split out from ...
	(forward_propagate_into_gimple_cond): ... here.  Adjust.
	(forward_propagate_into_cond): Likewise.
	(forward_propagate_comparison): Also propagate into
	comparisons on assignment RHS.  Change return value to
	behave similar to forward_propagate_into_cond.
	(tree_ssa_forward_propagate_single_use_vars): Handle
	strict-overflow warnings properly for forward_propagate_comparison.

From-SVN: r174428

gcc/ChangeLog

+2011-05-30  Richard Guenther  <rguenther@suse.de>
+
+	* tree-ssa-forwprop.c (forward_propagate_into_comparison):
+	New function split out from ...
+	(forward_propagate_into_gimple_cond): ... here.  Adjust.
+	(forward_propagate_into_cond): Likewise.
+	(forward_propagate_comparison): Also propagate into
+	comparisons on assignment RHS.  Change return value to
+	behave similar to forward_propagate_into_cond.
+	(tree_ssa_forward_propagate_single_use_vars): Handle
+	strict-overflow warnings properly for forward_propagate_comparison.
+
 2011-05-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* configure.ac (gcc_cv_lto_plugin): Determine lto plugin support