This fixes the vectorizer loop versioning code failing to clear
niter related info on the scalar loop as it assumed get_loop_copy
would work even for the outermost loop. The patch makes that
assumption hold by adjusting the loop versioning code.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
2021-07-05 Richard Biener <rguent...@suse.de>
PR middle-end/101291
* cfgloopmanip.c (loop_version): Set the loop copy of the
versioned loop to the new loop.
---
gcc/cfgloopmanip.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c
index e6df28036c4..2af59fedc92 100644
--- a/gcc/cfgloopmanip.c
+++ b/gcc/cfgloopmanip.c
@@ -1731,6 +1731,7 @@ loop_version (class loop *loop,
then_scale, else_scale);
copy_loop_info (loop, nloop);
+ set_loop_copy (loop, nloop);
/* loopify redirected latch_edge. Update its PENDING_STMTS. */
lv_flush_pending_stmts (latch_edge);
--
2.26.2
