Initial support for VM_CALL_ARGS_SPLAT (#6341)

* Initial support for VM_CALL_ARGS_SPLAT

This implements support for calls with splat (*) for some methods. In
benchmarks this made very little difference for most benchmarks, but a
large difference for binarytrees. Looking at side exits, many
benchmarks now don't exit for splat, but exit for some other
reason. Binarytrees however had a number of calls that used splat args
that are now much faster. In my non-scientific benchmarking this made
splat args performance on par with not using splat args at all.

* Fix wording and whitespace

Co-authored-by: Maxime Chevalier-Boisvert <maximechevalierb@gmail.com>

* Get rid of side_effect reassignment

Co-authored-by: Maxime Chevalier-Boisvert <maximechevalierb@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/yjit.c b/yjit.c
index a834191070..facddcca0a 100644
--- a/yjit.c
+++ b/yjit.c
@@ -604,6 +604,12 @@ rb_get_iseq_flags_has_rest(const rb_iseq_t *iseq)
 }
 
 bool
+rb_get_iseq_flags_ruby2_keywords(const rb_iseq_t *iseq)
+{
+    return iseq->body->param.flags.ruby2_keywords;
+}
+
+bool
 rb_get_iseq_flags_has_block(const rb_iseq_t *iseq)
 {
     return iseq->body->param.flags.has_block;