From 711188895e4d910aef399ac37084627e003433a8 Mon Sep 17 00:00:00 2001
From: Richard Sandiford <richard.sandiford@arm.com>
Date: Wed, 16 Nov 2016 14:21:32 +0000
Subject: [PATCH] Fix nb_iterations calculation in tree-vect-loop-manip.c
We previously stored the number of loop iterations rather
than the number of latch iterations.
gcc/
2016-11-15 Richard Sandiford <richard.sandiford@arm.com>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@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.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r242493
---
gcc/ChangeLog | 8 ++++++++
gcc/tree-vect-loop-manip.c | 5 ++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 722b94bff35b..cd59b0280c83 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2016-11-16 Richard Sandiford <richard.sandiford@arm.com>
+ Alan Hayward <alan.hayward@arm.com>
+ David Sherwood <david.sherwood@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.
+
2016-11-16 Richard Sandiford <richard.sandiford@arm.com>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
diff --git a/gcc/tree-vect-loop-manip.c b/gcc/tree-vect-loop-manip.c
index 6bfd332a1019..4c6b8c7459c4 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.
--
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