Introduce a new SSA-based intermediate format

v3_codegen is replaced by three new passes:

* beam_kernel_to_ssa which translates the Kernel Erlang format
  to a new SSA-based intermediate format.

* beam_ssa_pre_codegen which prepares the SSA-based format
  for code generation, including register allocation. Registers
  are allocated using the linear scan algorithm.

* beam_ssa_codegen which generates BEAM assembly code from the
  SSA-based format.

It easier and more effective to optimize the SSA-based format before X
and Y registers have been assigned.  The current optimization passes
constantly have to make sure no "holes" in the X register assignments
are created (that is, that no X register becomes undefined that an
allocation instruction depends on).

This commit also introduces the following optimizations:

* Replacing of tuple matching of records with the is_tagged_tuple
instruction. (Replacing beam_record.)

* Sinking of get_tuple_element instructions to just before the first
use of the extracted values. As well as potentially avoiding
extracting tuple elements when they are not actually used on all
executions paths, this optimization could also reduce the number
values that will need to be stored in Y registers. (Similar to
beam_reorder, but more effective.)

* Live optimizations, removing the definition of a variable that is
not subsequently used (provided that the operation has no side
effects), as well strength reduction of binary matching by replacing
the extraction of value from a binary with a skip instruction. (Used
to be done by beam_block, beam_utils, and v3_codegen.)

* Removal of redundant bs_restore2 instructions. (Formerly done
by beam_bs.)

* Type-based optimizations across branches. More effective than
the old beam_type pass that only did type-based optimizations in
basic blocks.

* Optimization of floating point instructions. (Formerly done
by beam_type.)

* Optimization of receive statements to introduce recv_mark and
recv_set instructions. More effective with far fewer restrictions
on what instructions are allowed between creating the reference
and entering the receive statement.

* Common subexpression elimination. (Formerly done by beam_block.)

1 files changed, 66 insertions, 0 deletions

diff --git a/lib/compiler/src/beam_ssa.hrl b/lib/compiler/src/beam_ssa.hrl
new file mode 100644
index 0000000000..fa76b08453
--- /dev/null
+++ b/lib/compiler/src/beam_ssa.hrl
@@ -0,0 +1,66 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2018. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-record(b_module, {anno=#{} :: beam_ssa:anno(),
+                   name :: module(),
+                   exports :: [{atom(),arity()}],
+                   attributes :: list(),
+                   body :: [beam_ssa:b_function()]}).
+-record(b_function, {anno=#{} :: beam_ssa:anno(),
+                     args :: [beam_ssa:b_var()],
+                     bs :: #{beam_ssa:label():=beam_ssa:b_blk()},
+                     cnt :: beam_ssa:label()}).
+
+-record(b_blk, {anno=#{} :: beam_ssa:anno(),
+                is :: [beam_ssa:b_set()],
+                last :: beam_ssa:terminator()}).
+-record(b_set, {anno=#{} :: beam_ssa:anno(),
+                dst=none :: 'none'|beam_ssa:b_var(),
+                op :: beam_ssa:op(),
+                args=[] :: [beam_ssa:argument()]}).
+
+%% Terminators.
+-record(b_ret, {anno=#{} :: beam_ssa:anno(),
+                arg :: beam_ssa:value()}).
+
+-record(b_br, {anno=#{},
+               bool :: beam_ssa:value(),
+               succ :: beam_ssa:label(),
+               fail :: beam_ssa:label()}).
+
+-record(b_switch, {anno=#{} :: beam_ssa:anno(),
+                   arg :: beam_ssa:value(),
+                   fail :: beam_ssa:label(),
+                   list :: [{beam_ssa:b_literal(),beam_ssa:label()}]}).
+
+%% Values.
+-record(b_var, {name :: beam_ssa:var_name()}).
+
+-record(b_literal, {val :: beam_ssa:literal_value()}).
+
+-record(b_remote, {mod   :: beam_ssa:value(),
+                   name  :: beam_ssa:value(),
+                   arity :: non_neg_integer()}).
+
+-record(b_local, {name  :: beam_ssa:b_literal(),
+                  arity :: non_neg_integer()}).
+
+%% If this block exists, it calls erlang:error(badarg).
+-define(BADARG_BLOCK, 1).