diff options
Diffstat (limited to 'lib/hipe')
| -rw-r--r-- | lib/hipe/icode/hipe_icode_primops.erl | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/lib/hipe/icode/hipe_icode_primops.erl b/lib/hipe/icode/hipe_icode_primops.erl index 84aae30291..a0deb31c42 100644 --- a/lib/hipe/icode/hipe_icode_primops.erl +++ b/lib/hipe/icode/hipe_icode_primops.erl @@ -504,16 +504,16 @@ type(Primop, Args) -> NewBinType = match_bin(erl_types:t_bitstr(0, Size), BinType), NewMatchState = erl_types:t_matchstate_update_present(NewBinType, MatchState), - if Signed =:= 0 -> - UpperBound = inf_add(safe_bsl(1, Size), -1), - erl_types:t_product([erl_types:t_from_range(0, UpperBound), - NewMatchState]); - Signed =:= 4 -> - erl_types:t_product([erl_types:t_from_range( - inf_inv(safe_bsl(1, Size-1)), - inf_add(safe_bsl(1, Size-1), -1)), - NewMatchState]) - end; + Range = + case Signed of + 0 -> + UpperBound = inf_add(safe_bsl_1(Size), -1), + erl_types:t_from_range(0, UpperBound); + 4 -> + Bound = safe_bsl_1(Size - 1), + erl_types:t_from_range(inf_inv(Bound), inf_add(Bound, -1)) + end, + erl_types:t_product([Range, NewMatchState]); [_Arg] -> NewBinType = match_bin(erl_types:t_bitstr(Size, 0), BinType), NewMatchState = @@ -969,18 +969,19 @@ check_fun_args(_, _) -> match_bin(Pattern, Match) -> erl_types:t_bitstr_match(Pattern, Match). -safe_bsl(0, _) -> 0; -safe_bsl(Base, Shift) when Shift =< 128 -> Base bsl Shift; -safe_bsl(Base, _Shift) when Base > 0 -> pos_inf; -safe_bsl(Base, _Shift) when Base < 0 -> neg_inf. +-spec safe_bsl_1(non_neg_integer()) -> non_neg_integer() | 'pos_inf'. + +safe_bsl_1(Shift) when Shift =< 128 -> 1 bsl Shift; +safe_bsl_1(_Shift) -> pos_inf. + +%% +%% The following two functions are stripped-down versions of more +%% general functions that exist in hipe_icode_range.erl +%% inf_inv(pos_inf) -> neg_inf; -inf_inv(neg_inf) -> pos_inf; -inf_inv(Number) -> -Number. +inf_inv(Number) when is_integer(Number) -> -Number. inf_add(pos_inf, _Number) -> pos_inf; -inf_add(neg_inf, _Number) -> neg_inf; -inf_add(_Number, pos_inf) -> pos_inf; -inf_add(_Number, neg_inf) -> neg_inf; inf_add(Number1, Number2) when is_integer(Number1), is_integer(Number2) -> Number1 + Number2. |