From b9faca269de1de51ae33577cc204befbea24243c Mon Sep 17 00:00:00 2001 From: Henrik Date: Tue, 29 May 2018 10:47:25 +0200 Subject: Revert "Prepare release" This reverts commit fd8e49b5bddceaae803670121b603b5eee8c5c08. --- lib/compiler/doc/src/notes.xml | 213 ----------------------------------------- 1 file changed, 213 deletions(-) (limited to 'lib/compiler/doc') diff --git a/lib/compiler/doc/src/notes.xml b/lib/compiler/doc/src/notes.xml index 357a940f24..bc1f68337b 100644 --- a/lib/compiler/doc/src/notes.xml +++ b/lib/compiler/doc/src/notes.xml @@ -32,219 +32,6 @@

This document describes the changes made to the Compiler application.

-
Compiler 7.2 - -
Fixed Bugs and Malfunctions - - -

Fixed an error in an optimization pass that caused - impossible tuple matching.

-

- Own Id: OTP-14855 Aux Id: ERL-549

- - -

The exception thrown when a list comprehension was - given a non-list term was not always correct.

-

- Own Id: OTP-14992 Aux Id: ERL-572

- - -
- - -
Improvements and New Features - - -

Changed the default behaviour of .erlang - loading: .erlang is no longer loaded from the - current directory. c:erlangrc(PathList) can be - used to search and load an .erlang file from user - specified directories.

escript, - erlc, dialyzer and typer no longer - load an .erlang at all.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-14439

- - -

Support for "tuple calls" have been removed from the - run-time system. Tuple calls was an undocumented and - unsupported feature which allowed the module argument for - an apply operation to be a tuple: Var = dict:new(), - Var:size(). This "feature" frequently caused - confusion, especially when such call failed. The - stacktrace would point out functions that don't exist in - the source code.

-

For legacy code that need to use parameterized modules - or tuple calls for some other reason, there is a new - compiler option called tuple_calls. When this - option is given, the compiler will generate extra code - that emulates the old behavior for calls where the module - is a variable.

-

- *** POTENTIAL INCOMPATIBILITY ***

-

- Own Id: OTP-14497

- - -

In code such as example({ok, Val}) -> {ok, - Val}. a tuple would be built. The compiler will now - automatically rewrite the code to - example({ok,Val}=Tuple) -> Tuple. which will - reduce code size, execution time, and remove GC - pressure.

-

- Own Id: OTP-14505

- - -

The optimization of case expression where only - one of the case arms can execute successfully has been - improved.

-

- Own Id: OTP-14525

- - -

Some uses of binary matching has been slightly - improved, eliminating unnecessary register shuffling.

-

- Own Id: OTP-14594 Aux Id: ERL-444

- - -

There is a new {compile_info,Info} option for - the compiler that allows BEAM-based languages such as - Elixir and LFE to add their own compiler versions.

-

- Own Id: OTP-14615 Aux Id: PR-1558

- - -

Loaded BEAM code in a 64-bit system requires less - memory because of better packing of operands for - instructions.

-

These memory savings were achieved by major - improvements to the beam_makeops scripts used when - building the run time system and BEAM compiler. There is - also new for documentation for beam_makeops that - describes how new BEAM instructions and loader - transformations can be implemented. The documentation is - found in here in a source directory or git repository: - erts/emulator/internal_doc/beam_makeops.md. An online - version can be found here: - https://github.com/erlang/otp/blob/master/erts/emulator/internal_doc/beam_makeops.md

-

- Own Id: OTP-14626

- - -

Size calculations for binary constructions has been - somewhat optimized, producing smaller code.

-

- Own Id: OTP-14654

- - -

When the value returned from a 'catch' - expression is ignored, no stacktrace will be built if an - exception is caught. That will save time and produce less - garbage. There are also some minor optimizations of - 'try/catch' both in the compiler and - run-time system.

-

- Own Id: OTP-14683

- - -

There is a new syntax in 'try/catch' for - retrieving the stacktrace without calling - 'erlang:get_stacktrace/0'. See the reference - manual for a description of the new syntax. The - 'erlang:get_stacktrace/0' BIF is now - deprecated.

-

- Own Id: OTP-14692

- - -

The following is an internal change in the compiler, - that is not noticeable for normal use of the compiler: - The module v3_life has been removed. Its - functionality has been simplified and integrated into - v3_codegen.

-

- Own Id: OTP-14712

- - -

The optimization of binary matching that delays - creation of sub binaries (see the Efficiency Guide) could - be thwarted by the argument order and could be necessary - to change the argument order. The compiler has now become - smarter and can handle any argument order.

-

- Own Id: OTP-14774

- - -

When the compiler was faced with complex case - expressions it would unnecessarily allocate stack - elements and shuffle data between x and y registers. - Improved code generation to only allocate a stack frame - when strictly necessary.

-

- Own Id: OTP-14808 Aux Id: ERL-514

- - -

There is a new option 'makedep_side_effect' for - the compiler and -MMD for 'erlc' that - generates dependencies and continues to compile as - normal.

-

- Own Id: OTP-14830

- - -

When compiling modules with huge functions, the - compiler would generate a lot of atoms for its internal, - sometimes so many that the atom table would overflow. The - compiler has been rewritten to generate far less internal - atoms to avoid filling the atom table.

-

- Own Id: OTP-14968 Aux Id: ERL-563

- - -

External funs with literal values for module, name, - and arity (e.g. erlang:abs/1) are now treated as - literals. That means more efficient code that produces - less garbage on the heap.

-

- Own Id: OTP-15003

- - -

Two new guards BIFs operating on maps have been added: - map_get/2 and is_map_key/2. They do the - same as maps:get/2 and maps:is_key/2, - respectively, except that they are allowed to be used in - guards.

-

- Own Id: OTP-15037 Aux Id: PR-1784, PR-1802

- - -

A call or apply of a literal external fun will be - replaced with a direct call.

-

- Own Id: OTP-15044 Aux Id: ERL-614

- - -

Part of EEP-44 has been implemented.

-

There is a new predefined macro called - OTP_RELEASE which is an integer indicating the OTP - release number (its value is 21 in this - release).

-

There are new preprocessor directives - -if(Condition). and -elif(Condition).. The - if/elif supports the builtin function - defined(Symbol).

-

- Own Id: OTP-15087 Aux Id: PR-1810

- - -
- -
-
Compiler 7.1.5
Fixed Bugs and Malfunctions -- cgit v1.2.3