diff options
| -rw-r--r-- | erts/configure.in | 5 | ||||
| -rw-r--r-- | erts/emulator/beam/bif.tab | 1 | ||||
| -rw-r--r-- | erts/emulator/beam/erl_math.c | 18 | ||||
| -rw-r--r-- | lib/asn1/src/asn1ct_imm.erl | 4 | ||||
| -rw-r--r-- | lib/compiler/src/beam_type.erl | 1 | ||||
| -rw-r--r-- | lib/compiler/src/beam_validator.erl | 1 | ||||
| -rw-r--r-- | lib/compiler/src/erl_bifs.erl | 1 | ||||
| -rw-r--r-- | lib/compiler/test/float_SUITE.erl | 2 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/math.xml | 1 | ||||
| -rw-r--r-- | lib/stdlib/src/math.erl | 7 |
10 files changed, 37 insertions, 4 deletions
diff --git a/erts/configure.in b/erts/configure.in index b3fe48d62c..7cb6b50708 100644 --- a/erts/configure.in +++ b/erts/configure.in @@ -4905,6 +4905,11 @@ LDFLAGS="$LDFLAGS $sanitizers" ]) dnl ---------------------------------------------------------------------- +dnl Check for log2 +dnl ---------------------------------------------------------------------- +AC_CHECK_FUNCS([log2]) + +dnl ---------------------------------------------------------------------- dnl Output the result. dnl ---------------------------------------------------------------------- diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab index aea3224342..1d0d214e77 100644 --- a/erts/emulator/beam/bif.tab +++ b/erts/emulator/beam/bif.tab @@ -194,6 +194,7 @@ bif math:erf/1 bif math:erfc/1 bif math:exp/1 bif math:log/1 +bif math:log2/1 bif math:log10/1 bif math:sqrt/1 bif math:atan2/2 diff --git a/erts/emulator/beam/erl_math.c b/erts/emulator/beam/erl_math.c index 16d4fdc09c..9b864628db 100644 --- a/erts/emulator/beam/erl_math.c +++ b/erts/emulator/beam/erl_math.c @@ -207,6 +207,24 @@ BIF_RETTYPE math_log_1(BIF_ALIST_1) return math_call_1(BIF_P, log, BIF_ARG_1); } +#ifdef HAVE_LOG2 +static double +log2_wrapper(double x) +{ + return log2(x); +} +#else +static double +log2_wrapper(double x) +{ + return log(x) / 0.6931471805599453; /* log(2.0); */ +} +#endif + +BIF_RETTYPE math_log2_1(BIF_ALIST_1) +{ + return math_call_1(BIF_P, log2_wrapper, BIF_ARG_1); +} BIF_RETTYPE math_log10_1(BIF_ALIST_1) { diff --git a/lib/asn1/src/asn1ct_imm.erl b/lib/asn1/src/asn1ct_imm.erl index 4f528b6f95..91820e08de 100644 --- a/lib/asn1/src/asn1ct_imm.erl +++ b/lib/asn1/src/asn1ct_imm.erl @@ -1585,7 +1585,7 @@ do_combine_put_bits(_, _, _) -> throw(impossible). debit(Budget0, Alternatives) -> - case Budget0 - log2(Alternatives) of + case Budget0 - math:log2(Alternatives) of Budget when Budget > 0.0 -> Budget; _ -> @@ -1598,8 +1598,6 @@ num_clauses([_|T], N) -> num_clauses(T, N+1); num_clauses([], N) -> N. -log2(N) -> - math:log(N) / math:log(2.0). collect_put_bits(Imm) -> lists:splitwith(fun({put_bits,V,_,_}) when is_integer(V) -> true; diff --git a/lib/compiler/src/beam_type.erl b/lib/compiler/src/beam_type.erl index cdddad4153..d9713cef0d 100644 --- a/lib/compiler/src/beam_type.erl +++ b/lib/compiler/src/beam_type.erl @@ -469,6 +469,7 @@ is_math_bif(erf, 1) -> true; is_math_bif(erfc, 1) -> true; is_math_bif(exp, 1) -> true; is_math_bif(log, 1) -> true; +is_math_bif(log2, 1) -> true; is_math_bif(log10, 1) -> true; is_math_bif(sqrt, 1) -> true; is_math_bif(atan2, 2) -> true; diff --git a/lib/compiler/src/beam_validator.erl b/lib/compiler/src/beam_validator.erl index 0acc7a227f..c156cf79fe 100644 --- a/lib/compiler/src/beam_validator.erl +++ b/lib/compiler/src/beam_validator.erl @@ -1818,6 +1818,7 @@ return_type_math(erf, 1) -> {float,[]}; return_type_math(erfc, 1) -> {float,[]}; return_type_math(exp, 1) -> {float,[]}; return_type_math(log, 1) -> {float,[]}; +return_type_math(log2, 1) -> {float,[]}; return_type_math(log10, 1) -> {float,[]}; return_type_math(sqrt, 1) -> {float,[]}; return_type_math(atan2, 2) -> {float,[]}; diff --git a/lib/compiler/src/erl_bifs.erl b/lib/compiler/src/erl_bifs.erl index 6c75538194..bcc2297250 100644 --- a/lib/compiler/src/erl_bifs.erl +++ b/lib/compiler/src/erl_bifs.erl @@ -134,6 +134,7 @@ is_pure(math, erf, 1) -> true; is_pure(math, erfc, 1) -> true; is_pure(math, exp, 1) -> true; is_pure(math, log, 1) -> true; +is_pure(math, log2, 1) -> true; is_pure(math, log10, 1) -> true; is_pure(math, pow, 2) -> true; is_pure(math, sin, 1) -> true; diff --git a/lib/compiler/test/float_SUITE.erl b/lib/compiler/test/float_SUITE.erl index afc04fd440..fb8da37f4f 100644 --- a/lib/compiler/test/float_SUITE.erl +++ b/lib/compiler/test/float_SUITE.erl @@ -118,6 +118,7 @@ math_functions(Config) when is_list(Config) -> ?line 0.0 = math:sinh(0), ?line 1.0 = math:cosh(0), ?line 0.0 = math:tanh(0), + 1.0 = math:log2(2), ?line 1.0 = math:log10(10), ?line -1.0 = math:cos(math:pi()), ?line 1.0 = math:exp(0), @@ -136,6 +137,7 @@ math_functions(Config) when is_list(Config) -> ?line 0.0 = math:sinh(id(0)), ?line 1.0 = math:cosh(id(0)), ?line 0.0 = math:tanh(id(0)), + 1.0 = math:log2(id(2)), ?line 1.0 = math:log10(id(10)), ?line 1.0 = math:exp(id(0)), ?line 0.0 = math:log(id(1)), diff --git a/lib/stdlib/doc/src/math.xml b/lib/stdlib/doc/src/math.xml index 43cd20e726..7cfc8a1175 100644 --- a/lib/stdlib/doc/src/math.xml +++ b/lib/stdlib/doc/src/math.xml @@ -67,6 +67,7 @@ <name name="atanh" arity="1"/> <name name="exp" arity="1"/> <name name="log" arity="1"/> + <name name="log2" arity="1"/> <name name="log10" arity="1"/> <name name="pow" arity="2"/> <name name="sqrt" arity="1"/> diff --git a/lib/stdlib/src/math.erl b/lib/stdlib/src/math.erl index 98a70b1644..43f736e54c 100644 --- a/lib/stdlib/src/math.erl +++ b/lib/stdlib/src/math.erl @@ -24,7 +24,7 @@ -export([sin/1, cos/1, tan/1, asin/1, acos/1, atan/1, atan2/2, sinh/1, cosh/1, tanh/1, asinh/1, acosh/1, atanh/1, exp/1, log/1, - log10/1, pow/2, sqrt/1, erf/1, erfc/1]). + log2/1, log10/1, pow/2, sqrt/1, erf/1, erfc/1]). -spec acos(X) -> float() when X :: number(). @@ -92,6 +92,11 @@ exp(_) -> log(_) -> erlang:nif_error(undef). +-spec log2(X) -> float() when + X :: number(). +log2(_) -> + erlang:nif_error(undef). + -spec log10(X) -> float() when X :: number(). log10(_) -> |