diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/compiler/src/beam_ssa_type.erl | 2 | ||||
| -rw-r--r-- | lib/compiler/test/receive_SUITE.erl | 27 |
2 files changed, 27 insertions, 2 deletions
diff --git a/lib/compiler/src/beam_ssa_type.erl b/lib/compiler/src/beam_ssa_type.erl index ede57875e2..7ef49fee64 100644 --- a/lib/compiler/src/beam_ssa_type.erl +++ b/lib/compiler/src/beam_ssa_type.erl @@ -309,6 +309,8 @@ simplify(#b_set{op=put_tuple,args=Args}=I, _Ts) -> none -> I; List -> #b_literal{val=list_to_tuple(List)} end; +simplify(#b_set{op=wait_timeout,args=[#b_literal{val=0}]}, _Ts) -> + #b_literal{val=true}; simplify(#b_set{op=wait_timeout,args=[#b_literal{val=infinity}]}=I, _Ts) -> I#b_set{op=wait,args=[]}; simplify(I, _Ts) -> I. diff --git a/lib/compiler/test/receive_SUITE.erl b/lib/compiler/test/receive_SUITE.erl index 4219768d6f..12108445f0 100644 --- a/lib/compiler/test/receive_SUITE.erl +++ b/lib/compiler/test/receive_SUITE.erl @@ -25,7 +25,7 @@ init_per_group/2,end_per_group/2, init_per_testcase/2,end_per_testcase/2, export/1,recv/1,coverage/1,otp_7980/1,ref_opt/1, - wait/1,recv_in_try/1,double_recv/1]). + wait/1,recv_in_try/1,double_recv/1,receive_var_zero/1]). -include_lib("common_test/include/ct.hrl"). @@ -45,7 +45,7 @@ all() -> groups() -> [{p,test_lib:parallel(), [recv,coverage,otp_7980,ref_opt,export,wait, - recv_in_try,double_recv]}]. + recv_in_try,double_recv,receive_var_zero]}]. init_per_suite(Config) -> @@ -378,4 +378,27 @@ do_double_recv(_, Msg) -> error end. +%% Test 'after Z', when Z =:= 0 been propagated as an immediate by the type +%% optimization pass. +receive_var_zero(Config) when is_list(Config) -> + self() ! x, + self() ! y, + Z = zero(), + timeout = receive + z -> ok + after Z -> timeout + end, + timeout = receive + after Z -> timeout + end, + self() ! w, + receive + x -> ok; + Other -> + ct:fail({bad_message,Other}) + end. + +zero() -> 0. + + id(I) -> I. |