We previously stored the number of loop iterations rather than the number of latch iterations.
Tested on aarch64-linux-gnu and x86_64-linux-gnu. OK to install? Thanks, Richard [ This patch is part of the SVE series posted here: https://gcc.gnu.org/ml/gcc/2016-11/msg00030.html ] gcc/ 2016-11-15 Richard Sandiford <richard.sandif...@arm.com> Alan Hayward <alan.hayw...@arm.com> David Sherwood <david.sherw...@arm.com> * tree-vect-loop-manip.c (slpeel_make_loop_iterate_ntimes): Set nb_iterations to the number of latch iterations rather than the number of loop iterations. diff --git a/gcc/tree-vect-loop-manip.c b/gcc/tree-vect-loop-manip.c index 6bfd332..4c6b8c7 100644 --- a/gcc/tree-vect-loop-manip.c +++ b/gcc/tree-vect-loop-manip.c @@ -285,7 +285,10 @@ slpeel_make_loop_iterate_ntimes (struct loop *loop, tree niters) LOCATION_LINE (loop_loc)); dump_gimple_stmt (MSG_NOTE, TDF_SLIM, cond_stmt, 0); } - loop->nb_iterations = niters; + + /* Record the number of latch iterations. */ + loop->nb_iterations = fold_build2 (MINUS_EXPR, TREE_TYPE (niters), niters, + build_int_cst (TREE_TYPE (niters), 1)); } /* Helper routine of slpeel_tree_duplicate_loop_to_edge_cfg.
