From fdf09e81de5e7f1ecfe71f98b56c411073badae8 Mon Sep 17 00:00:00 2001
From: Olivier Girondel <olivier@biniou.info>
Date: Sun, 4 Jan 2015 04:40:55 +0100
Subject: Add math:log2/1

---
 lib/compiler/src/beam_type.erl      | 1 +
 lib/compiler/src/beam_validator.erl | 1 +
 lib/compiler/src/erl_bifs.erl       | 1 +
 lib/compiler/test/float_SUITE.erl   | 2 ++
 4 files changed, 5 insertions(+)

(limited to 'lib/compiler')

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)),
-- 
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