re PR rtl-optimization/17791 (doloop can produce wrong code causes Ada bootstrap failure)

	PR rtl-optimization/17791
	* loop-doloop.c (doloop_modify): Take number of iterations as
	argument.
	(doloop_optimize): Extend or shorten the number of iterations
	when changing mode of counter register.
	* loop-iv.c (lowpart_subreg): Export.
	* rtl.h (lowpart_subreg): Declare.

From-SVN: r88668

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/rtl.h b/gcc/rtl.h
index ac2419b..e0f86ee 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -1432,6 +1432,10 @@ extern void push_to_full_sequence (rtx, rtx);
 extern rtx immed_double_const (HOST_WIDE_INT, HOST_WIDE_INT,
 			       enum machine_mode);
 
+/* In loop-iv.c  */
+
+extern rtx lowpart_subreg (enum machine_mode, rtx, enum machine_mode);
+
 /* In varasm.c  */
 extern rtx force_const_mem (enum machine_mode, rtx);