diff options
Diffstat (limited to 'lib/compiler/test/bs_match_SUITE.erl')
| -rw-r--r-- | lib/compiler/test/bs_match_SUITE.erl | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/lib/compiler/test/bs_match_SUITE.erl b/lib/compiler/test/bs_match_SUITE.erl index 7557d6d57b..4bd5e8e2e1 100644 --- a/lib/compiler/test/bs_match_SUITE.erl +++ b/lib/compiler/test/bs_match_SUITE.erl @@ -40,7 +40,7 @@ map_and_binary/1,unsafe_branch_caching/1, bad_literals/1,good_literals/1,constant_propagation/1, parse_xml/1,get_payload/1,escape/1,num_slots_different/1, - beam_bsm/1,guard/1,is_ascii/1]). + beam_bsm/1,guard/1,is_ascii/1,non_opt_eq/1]). -export([coverage_id/1,coverage_external_ignore/2]). @@ -73,7 +73,7 @@ groups() -> map_and_binary,unsafe_branch_caching, bad_literals,good_literals,constant_propagation,parse_xml, get_payload,escape,num_slots_different, - beam_bsm,guard,is_ascii]}]. + beam_bsm,guard,is_ascii,non_opt_eq]}]. init_per_suite(Config) -> @@ -1654,6 +1654,21 @@ do_is_ascii(<<C,_/binary>>) when C >= 16#80 -> do_is_ascii(<<_, T/binary>>) -> do_is_ascii(T). +non_opt_eq(_Config) -> + true = non_opt_eq([], <<>>), + true = non_opt_eq([$a], <<$a>>), + false = non_opt_eq([$a], <<$b>>), + ok. + +%% An example from the Efficiency Guide. It used to be not optimized, +%% but now it can be optimized. + +non_opt_eq([H|T1], <<H,T2/binary>>) -> + non_opt_eq(T1, T2); +non_opt_eq([_|_], <<_,_/binary>>) -> + false; +non_opt_eq([], <<>>) -> + true. check(F, R) -> R = F(). |