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authorBjörn Gustavsson <bjorn@erlang.org>2017-05-08 16:08:34 +0200
committerBjörn Gustavsson <bjorn@erlang.org>2017-05-10 10:37:11 +0200
commit8f84553cb56a6cbe0ae6785dba18c81ed6e47641 (patch)
tree31f0519c91b1ea265907e74491fd13d209a03ae9 /lib
parent2bcc3f97e9273c543b803a812da393e640464978 (diff)
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erl_bifs: Remove pure BIFs serving no useful purpose
Functions that can are known be pure can be evaluated at compile-time if the arguments are literals and if the result is expressible as a literal. list_to_ref/1 and list_to_port/1 returns terms that cannot be expressed as literals, so the optimization is not possible. The argument for port_to_list/1 is never a literal, so there is no way to evaluate it at compile-time. Therefore, marking those functions as pure serves no useful purpose. Note: list_to_pid/1 *is* marked as pure, but only so that we can test the code in sys_core_fold that rejects pure functions that evaluate to at term that is not possible to express as a literal. It is sufficient to have one pure function of that kind.
Diffstat (limited to 'lib')
-rw-r--r--lib/compiler/src/erl_bifs.erl3
1 files changed, 0 insertions, 3 deletions
diff --git a/lib/compiler/src/erl_bifs.erl b/lib/compiler/src/erl_bifs.erl
index 043fe227a9..bafa9d75b7 100644
--- a/lib/compiler/src/erl_bifs.erl
+++ b/lib/compiler/src/erl_bifs.erl
@@ -107,14 +107,11 @@ is_pure(erlang, list_to_binary, 1) -> true;
is_pure(erlang, list_to_float, 1) -> true;
is_pure(erlang, list_to_integer, 1) -> true;
is_pure(erlang, list_to_pid, 1) -> true;
-is_pure(erlang, list_to_port, 1) -> true;
-is_pure(erlang, list_to_ref, 1) -> true;
is_pure(erlang, list_to_tuple, 1) -> true;
is_pure(erlang, max, 2) -> true;
is_pure(erlang, min, 2) -> true;
is_pure(erlang, phash, 2) -> false;
is_pure(erlang, pid_to_list, 1) -> true;
-is_pure(erlang, port_to_list, 1) -> true;
is_pure(erlang, round, 1) -> true;
is_pure(erlang, setelement, 3) -> true;
is_pure(erlang, size, 1) -> true;