path: root/erts/emulator/beam/ops.tab

#
# %CopyrightBegin%
#
# Copyright Ericsson AB 1997-2018. 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%
#

#
# The instructions that follows are only known by the loader and the emulator.
# They can be changed without recompiling old Beam files.
#
# Instructions starting with a "i_" prefix are instructions produced by
# instruction transformations; thus, they never occur in BEAM files.
#

# The too_old_compiler/0 instruction is specially handled in beam_load.c
# to produce a user-friendly message informing the user that the module
# needs to be re-compiled with a modern compiler.

too_old_compiler/0
too_old_compiler | never() =>

# In R9C and earlier, the loader used to insert special instructions inside
# the module_info/0,1 functions. (In R10B and later, the compiler inserts
# an explicit call to an undocumented BIF, so that no loader trickery is
# necessary.) Since the instructions don't work correctly in R12B, simply
# refuse to load the module.

func_info M=a a==am_module_info A=u==0 | label L | move n x==0 => too_old_compiler
func_info M=a a==am_module_info A=u==1 | label L | move n x==0 => too_old_compiler

# The undocumented and unsupported guard BIF is_constant/1 was removed
# in R13. The is_constant/2 operation is marked as obsolete in genop.tab,
# so the loader will automatically generate a too_old_compiler message
# it is used, but we need to handle the is_constant/1 BIF specially here.

bif1 Fail u$func:erlang:is_constant/1 Src Dst => too_old_compiler

# Since the constant pool was introduced in R12B, empty tuples ({})
# are literals. Therefore we no longer need to allow put_tuple/2
# with a tuple size of zero.

put_tuple u==0 d => too_old_compiler

#
# All the other instructions.
#

%cold
label L
i_func_info I a a I
int_code_end

i_generic_breakpoint
i_debug_breakpoint
i_return_time_trace
i_return_to_trace
i_yield
trace_jump W
%hot

return

#
# To ensure that a "move Src x(0)" instruction can be combined
# with the following call instruction, we need to make sure that
# there is no line/1 instruction between the move and the call.
#
# A tail-recursive call to an external function (non-BIF) will
# never be saved on the stack, so there is no reason to keep
# the line instruction. (The compiler did not remove the line
# instruction because it cannot tell the difference between
# BIFs and ordinary Erlang functions.)
#

move S X0=x==0 | line Loc | call_ext Ar Func => \
     line Loc | move S X0 | call_ext Ar Func
move S X0=x==0 | line Loc | call_ext_last Ar Func=u$is_not_bif D => \
     move S X0 | call_ext_last Ar Func D
move S X0=x==0 | line Loc | call_ext_only Ar Func=u$is_not_bif => \
     move S X0 | call_ext_only Ar Func
move S X0=x==0 | line Loc | call Ar Func => \
     line Loc | move S X0 | call Ar Func

line Loc | func_info M F A => func_info M F A | line Loc

line I

allocate t t?
allocate_heap t I t?

%cold
deallocate Q
%hot

init y
allocate_zero t t?
allocate_heap_zero t I t?

trim N Remaining => i_trim N
i_trim t

test_heap I t?

allocate_heap S u==0 R => allocate S R
allocate_heap_zero S u==0 R => allocate_zero S R

init Y1 | init Y2 | init Y3 | succ(Y1,Y2) | succ(Y2,Y3) => init_seq3 Y1
init_seq3 Y1 | init Y4 | succ3(Y1,Y4) => init_seq4 Y1
init_seq4 Y1 | init Y5 | succ4(Y1,Y5) => init_seq5 Y1

init_seq3 y
init_seq4 y
init_seq5 y

init Y1 | init Y2 | init Y3 => init3 Y1 Y2 Y3
init Y1 | init Y2 => init2 Y1 Y2

init2 y y
init3 y y y


# Selecting values

select_val S=aiq Fail=f Size=u Rest=* => const_select_val(S, Fail, Size, Rest)

select_val S=s Fail=f Size=u Rest=* | use_jump_tab(Size, Rest) => \
  gen_jump_tab(S, Fail, Size, Rest)

is_integer Fail=f S | select_val S=s Fail=f Size=u Rest=* | use_jump_tab(Size, Rest) => \
  gen_jump_tab(S, Fail, Size, Rest)

is_integer TypeFail=f S | select_val S=s Fail=f Size=u Rest=* | \
	   mixed_types(Size, Rest) => \
  gen_split_values(S, TypeFail, Fail, Size, Rest)

select_val S=s Fail=f Size=u Rest=* | mixed_types(Size, Rest) => \
  gen_split_values(S, Fail, Fail, Size, Rest)

is_integer Fail=f S | select_val S=d Fail=f Size=u Rest=* | \
  fixed_size_values(Size, Rest) => gen_select_val(S, Fail, Size, Rest)

is_atom Fail=f S | select_val S=d Fail=f Size=u Rest=* | \
  fixed_size_values(Size, Rest) => gen_select_val(S, Fail, Size, Rest)

select_val S=s Fail=f Size=u Rest=* | floats_or_bignums(Size, Rest) => \
  gen_select_literals(S, Fail, Size, Rest)

select_val S=d Fail=f Size=u Rest=* | fixed_size_values(Size, Rest) => \
  gen_select_val(S, Fail, Size, Rest)

is_tuple Fail=f S | select_tuple_arity S=d Fail=f Size=u Rest=* => \
  gen_select_tuple_arity(S, Fail, Size, Rest)

select_tuple_arity S=d Fail=f Size=u Rest=* => \
  gen_select_tuple_arity(S, Fail, Size, Rest)

i_select_val_bins xy f? I

i_select_val_lins xy f? I

i_select_val2 xy f? c c

i_select_tuple_arity xy f? I

i_select_tuple_arity2 xy f? A A

i_jump_on_val_zero xy f? I

i_jump_on_val xy f? I W

get_list xy xy xy

# The following get_list instructions using x(0) are frequently used.
get_list r x x
get_list r r y
get_list x r x
get_list r x y
get_list r y r
get_list r x r

get_hd xy xy
get_tl xy xy

# Old-style catch.
catch y f
catch_end y

# Try/catch.
try Y F => catch Y F

try_case y
try_end y

%cold
try_case_end s
%hot

# Destructive set tuple element

set_tuple_element s S P

# Get tuple element

i_get_tuple_element xy P xy

i_get_tuple_element2 x P x
i_get_tuple_element2_dst x P x x
i_get_tuple_element2_dst x P y y

i_get_tuple_element3 x P x

%cold
is_number f? xy
%hot

is_number Fail=f i =>
is_number Fail=f na => jump Fail
is_number Fail Literal=q => move Literal x | is_number Fail x

jump f

#
# Expection rasing instructions. Infrequently executed.
#

%cold
case_end NotInX=cy => move NotInX x | case_end x
badmatch NotInX=cy => move NotInX x | badmatch x

case_end x

badmatch x

if_end

# Operands for raise/2 are almost always in x(2) and x(1).
# Optimize for that case.
raise x==2 x==1 => i_raise
raise Trace=y Value=y => move Trace x=2 | move Value x=1 | i_raise
raise Trace Value => move Trace x | move Value x=1 | move x x=2 | i_raise

i_raise

# Internal now, but could be useful to make known to the compiler.
badarg j
system_limit j

%hot

#
# Move instructions.
#

move C=cxy x==0 | jump Lbl => move_jump Lbl C

move_jump f ncxy

# Movement to and from the stack is common
# Try to pack as much as we can into one instruction

# Window move
move_window/5
move_window/6

# x -> y

move X1=x Y1=y | move X2=x Y2=y | move X3=x Y3=y | succ(Y1,Y2) | succ(Y2,Y3) => \
    move_window X1 X2 X3 Y1 Y3

move X1=x Y1=y | move X2=x Y2=y | succ(Y1,Y2) => \
    move_window2 X1 X2 Y1

move_window X1=x X2=x X3=x Y1=y Y3=y | move X4=x Y4=y | succ(Y3,Y4) => \
    move_window X1 X2 X3 X4 Y1 Y4

move_window X1=x X2=x X3=x X4=x Y1=y Y4=y | move X5=x Y5=y | succ(Y4,Y5) => \
    move_window5 X1 X2 X3 X4 X5 Y1

move_window X1=x X2=x X3=x Y1=y Y3=y => move_window3 X1 X2 X3 Y1
move_window X1=x X2=x X3=x X4=x Y1=y Y4=y => move_window4 X1 X2 X3 X4 Y1

move_window2 x x y
move_window3 x x x y
move_window4 x x x x y
move_window5 x x x x x y

# Swap registers.
move R1=x Tmp=x | move R2=x R1 | move Tmp R2 => swap_temp R1 R2 Tmp

swap_temp R1 R2 Tmp | line Loc | apply Live | is_killed_apply(Tmp, Live) => \
  swap R1 R2 | line Loc | apply Live

swap_temp R1 R2 Tmp | line Loc | call Live Addr | is_killed(Tmp, Live) => \
  swap R1 R2 | line Loc | call Live Addr
swap_temp R1 R2 Tmp | call_only Live Addr | \
  is_killed(Tmp, Live) => swap R1 R2 | call_only Live Addr
swap_temp R1 R2 Tmp | call_last Live Addr D | \
  is_killed(Tmp, Live) => swap R1 R2 | call_last Live Addr D

swap_temp R1 R2 Tmp | line Loc | call_ext Live Addr | is_killed(Tmp, Live) => \
  swap R1 R2 | line Loc | call_ext Live Addr
swap_temp R1 R2 Tmp | line Loc | call_ext_only Live Addr | \
  is_killed(Tmp, Live) => swap R1 R2 | line Loc | call_ext_only Live Addr
swap_temp R1 R2 Tmp | line Loc | call_ext_last Live Addr D | \
  is_killed(Tmp, Live) => swap R1 R2 | line Loc | call_ext_last Live Addr D

swap_temp x x x

swap x x

# move_dup

move Src=x D1=x | move Src=x D2=x => move_dup Src D1 D2
move Src=x SD=x | move SD=x  D=x  => move_dup Src SD D

move_dup x x x

# move_shift

move SD=x D=x | move Src=xy SD=x | distinct(D, Src) => move_shift Src SD D
move SD=y D=x | move Src=x  SD=y | distinct(D, Src) => move_shift Src SD D
move SD=x D=y | move Src=x  SD=x | distinct(D, Src) => move_shift Src SD D

move_shift x x x
move_shift y x x
move_shift x y x
move_shift x x y

# move2_par x x x x

move X1=x X2=x | move X3=x X4=x | independent_moves(X1, X2, X3, X4) => \
     move2_par X1 X2 X3 X4
move2_par x x x x

# move2_par x x x y

move X1=x X2=x | move X3=x Y1=y | independent_moves(X1, X2, X3, Y1) => \
     move2_par X1 X2 X3 Y1
move X3=x Y1=y | move X1=x X2=x | independent_moves(X3, Y1, X1, X2) => \
     move2_par X1 X2 X3 Y1
move2_par x x x y

# move2_par y x y x

move Y1=y X1=x | move Y2=y X2=x => move2_par Y1 X1 Y2 X2
move2_par y x y x

# move2_par y x x y

move S1=y S2=x | move X1=x Y1=y | independent_moves(S1, S2, X1, Y1) => \
     move2_par S1 S2 X1 Y1
move X1=x Y1=y | move S1=y S2=x | independent_moves(S1, S2, X1, Y1) => \
     move2_par S1 S2 X1 Y1
move2_par y x x y

# move2_par y x x x

move Y1=y X1=x | move S1=x D1=x | independent_moves(Y1, X1, S1, D1) => \
     move2_par Y1 X1 S1 D1
move S1=x D1=x | move Y1=y X1=x | independent_moves(Y1, X1, S1, D1) => \
     move2_par Y1 X1 S1 D1
move2_par y x x x

# move3

move2_par Y1=y X1=x Y2=y X2=x | move Y3=y X3=x => move3 Y1 X1 Y2 X2 Y3 X3
move2_par X1=x X2=x X3=x X4=x | move X5=x X6=x => move3 X1 X2 X3 X4 X5 X6

move3 y x y x y x
move3 x x x x x x

# move_x1, move_x2

move C=aiq X=x==1 => move_x1 C
move C=aiq X=x==2 => move_x2 C

move n D=y => init D

move_x1 c
move_x2 c

move xy xy
move c xy
move n x

# The following move instructions using x(0) are frequently used.

move x r
move r x
move y r
move c r
move r y

# Receive operations.

loop_rec Fail x==0 | smp_mark_target_label(Fail) => i_loop_rec Fail

label L | wait_timeout Fail Src | smp_already_locked(L) => \
    label L | wait_timeout_locked Src Fail
wait_timeout Fail Src => wait_timeout_unlocked Src Fail

wait_timeout_unlocked Src=aiq Fail => gen_literal_timeout(Fail, Src)
wait_timeout_locked Src=aiq Fail => gen_literal_timeout_locked(Fail, Src)

label L | wait Fail | smp_already_locked(L) => label L | wait_locked Fail
wait Fail => wait_unlocked Fail

label L | timeout | smp_already_locked(L) => label L | timeout_locked

remove_message
timeout
timeout_locked
i_loop_rec f
loop_rec_end f
wait_locked f
wait_unlocked f

# Note that a timeout value must fit in 32 bits.
wait_timeout_unlocked_int I f
wait_timeout_unlocked s f
wait_timeout_locked_int I f
wait_timeout_locked s f

%cold
i_wait_error
i_wait_error_locked
%hot

send

#
# Optimized comparisons with one immediate/literal operand.
#

is_eq_exact Lbl S S =>
is_eq_exact Lbl C1=c C2=c => move C1 x | is_eq_exact Lbl x C2
is_eq_exact Lbl C=c R=xy => is_eq_exact Lbl R C

is_eq_exact Lbl R=xy n => is_nil Lbl R
is_eq_exact Lbl R=xy C=ia => i_is_eq_exact_immed Lbl R C
is_eq_exact Lbl R=xy C=q => i_is_eq_exact_literal Lbl R C

is_ne_exact Lbl S S => jump Lbl
is_ne_exact Lbl C1=c C2=c => move C1 x | is_ne_exact Lbl x C2
is_ne_exact Lbl C=c R=xy => is_ne_exact Lbl R C

is_ne_exact Lbl R=xy C=ian => i_is_ne_exact_immed Lbl R C
is_ne_exact Lbl R=xy C=q => i_is_ne_exact_literal Lbl R C

i_is_eq_exact_immed f? rxy c

i_is_eq_exact_literal f? xy c

i_is_ne_exact_immed f? xy c

i_is_ne_exact_literal f? xy c

is_eq_exact Lbl Y=y X=x => is_eq_exact Lbl X Y
is_eq_exact f? x xy
is_eq_exact f? y y

is_ne_exact f? S S

is_lt f? x x
is_lt f? x c
is_lt f? c x
%cold
is_lt f? s s
%hot

is_ge f? x x
is_ge f? x c
is_ge f? c x
%cold
is_ge f? s s
%hot

is_eq Fail=f Const=c Reg=xy => is_eq Fail Reg Const
is_eq Fail=f C1=c C2=c => move C1 x | is_eq Fail x C2
is_eq f? S s

is_ne Fail=f Const=c Reg=xy => is_ne Fail Reg Const
is_ne Fail=f C1=c C2=c => move C1 x | is_ne Fail x C2
is_ne f? S s

#
# Putting tuples.
#
# Code compiled with OTP 22 and later uses put_tuple2 to
# to construct a tuple.
#
# Code compiled before OTP 22 uses put_tuple + one put instruction
# per element. Translate to put_tuple2.
#

i_put_tuple/2
put_tuple Arity Dst => i_put_tuple Dst u

i_put_tuple Dst Arity Puts=* | put S1 | put S2 | \
  put S3 | put S4 | put S5 => \
	    tuple_append_put5(Arity, Dst, Puts, S1, S2, S3, S4, S5)

i_put_tuple Dst Arity Puts=* | put S => \
	    tuple_append_put(Arity, Dst, Puts, S)

i_put_tuple Dst Arity Puts=* => put_tuple2 Dst Arity Puts

put_tuple2 xy I

#
# Putting lists.
#
# The instruction "put_list Const [] Dst" were generated in rare
# circumstances up to and including OTP 18. Starting with OTP 19,
# AFAIK, it should never be generated.
#
put_list Const=c n Dst => move Const x | put_list x n Dst

put_list Src Dst=x Dst => update_list Src Dst

update_list xyc x

put_list x n x
put_list y n x
put_list x x x
put_list y x x

put_list y y x
put_list x y x

# put_list SrcReg Constant Dst

put_list x c x
put_list x c y

put_list y c x

# put_list Constant SrcReg Dst

put_list c x x
put_list c y x

# The following put_list instructions using x(0) are frequently used.

put_list r n r
put_list r n x
put_list r x x
put_list r x r
put_list x x r

%cold
put_list s s d
%hot


#
# Some more only used by the emulator
#

%cold
normal_exit
continue_exit
apply_bif
call_nif
call_error_handler
error_action_code
return_trace
%hot

#
# Instruction transformations & folded instructions.
#

# Note: There is no 'move_return y r', since there never are any y registers
# when we do move_return (if we have y registers, we must do move_deallocate_return).

move S x==0 | return => move_return S

move_return xcn

move S x==0 | deallocate D | return => move_deallocate_return S D

move_deallocate_return xycn Q

deallocate D | return => deallocate_return D

deallocate_return Q

test_heap Need u==1 | put_list Y=y x==0 x==0 => test_heap_1_put_list Need Y

test_heap_1_put_list I y

#
# is_tagged_tuple Fail=f Src=rxy Arity Atom=a
#

is_tagged_tuple Fail Literal=q Arity Atom => \
    move Literal x | is_tagged_tuple Fail x Arity Atom
is_tagged_tuple Fail=f c Arity Atom  => jump Fail

is_tagged_tuple f? rxy A a

# Test tuple & arity (head)

is_tuple Fail Literal=q => move Literal x | is_tuple Fail x
is_tuple Fail=f c => jump Fail
is_tuple Fail=f S=xy | test_arity Fail=f S=xy Arity => is_tuple_of_arity Fail S Arity

is_tuple_of_arity f? rxy A

is_tuple f? rxy

test_arity Fail Literal=q Arity => move Literal x | test_arity Fail x Arity
test_arity Fail=f c Arity => jump Fail
test_arity Fail Tuple=x Arity | get_tuple_element Tuple Pos Dst=x => \
   test_arity_get_tuple_element Fail Tuple Arity Pos Dst

test_arity f? xy A

test_arity_get_tuple_element f? x A P x

get_tuple_element Reg=x P1 D1=x | get_tuple_element Reg=x P2 D2=x | \
   get_tuple_element Reg=x P3 D3=x | \
   succ(P1, P2) | succ(P2, P3) | \
   succ(D1, D2) | succ(D2, D3) => i_get_tuple_element3 Reg P1 D1

get_tuple_element Reg=x P1 D1=x | get_tuple_element Reg=x P2 D2=x | \
   succ(P1, P2) | succ(D1, D2) => i_get_tuple_element2 Reg P1 D1

get_tuple_element Reg=x P1 D1=x | get_tuple_element Reg=x P2 D2=x | \
   succ(P1, P2) | distinct(D1, Reg) => i_get_tuple_element2_dst Reg P1 D1 D2

get_tuple_element Reg=x P1 D1=y | get_tuple_element Reg=x P2 D2=y | \
   succ(P1, P2) => i_get_tuple_element2_dst Reg P1 D1 D2

get_tuple_element Reg P Dst => i_get_tuple_element Reg P Dst

is_integer Fail=f i =>
is_integer Fail=f an => jump Fail
is_integer Fail Literal=q => move Literal x | is_integer Fail x

is_integer Fail=f S=x | allocate Need Regs => is_integer_allocate Fail S Need Regs

is_integer_allocate f? x t t

is_integer f? xy

is_list Fail=f n =>
is_list Fail Literal=q => move Literal x | is_list Fail x
is_list Fail=f c => jump Fail
is_list f? x
%cold
is_list f? y
%hot

is_nonempty_list Fail=f S=x | allocate Need Rs => is_nonempty_list_allocate Fail S Need Rs

is_nonempty_list Fail=f S=x | get_list S D1=x D2=x => \
  is_nonempty_list_get_list Fail S D1 D2

is_nonempty_list Fail=f S=x | get_hd S Dst=x => \
  is_nonempty_list_get_hd Fail S Dst

is_nonempty_list Fail=f S=x | get_tl S Dst=x => \
  is_nonempty_list_get_tl Fail S Dst

is_nonempty_list_allocate f? rx t t

is_nonempty_list_get_list f? rx x x
is_nonempty_list_get_hd f? x x
is_nonempty_list_get_tl f? x x

is_nonempty_list f? xy

is_atom f? x
%cold
is_atom f? y
%hot
is_atom Fail=f a =>
is_atom Fail=f niq => jump Fail

is_float f? x
%cold
is_float f? y
%hot
is_float Fail=f nai => jump Fail
is_float Fail Literal=q => move Literal x | is_float Fail x

is_nil Fail=f n =>
is_nil Fail=f qia => jump Fail

is_nil f? xy

is_binary Fail Literal=q => move Literal x | is_binary Fail x
is_binary Fail=f c => jump Fail
is_binary f? x
%cold
is_binary f? y
%hot

# XXX Deprecated.
is_bitstr Fail Term => is_bitstring Fail Term

is_bitstring Fail Literal=q => move Literal x | is_bitstring Fail x
is_bitstring Fail=f c => jump Fail
is_bitstring f? x
%cold
is_bitstring f? y
%hot

is_reference Fail=f cq => jump Fail
is_reference f? x
%cold
is_reference f? y
%hot

is_pid Fail=f cq => jump Fail
is_pid f? x
%cold
is_pid f? y
%hot

is_port Fail=f cq => jump Fail
is_port f? x
%cold
is_port f? y
%hot

is_boolean Fail=f a==am_true =>
is_boolean Fail=f a==am_false =>
is_boolean Fail=f ac => jump Fail

%cold
is_boolean f? xy
%hot

is_function2 Fail=f Fun Arity => gen_is_function2(Fail, Fun, Arity)

%cold
cold_is_function2 f? x x
%hot
hot_is_function2 f? S t

# Allocating & initializing.
allocate Need Regs | init Y => allocate_init Need Regs Y
init Y1 | init Y2 => init2 Y1 Y2

allocate_init t t? y

#################################################################
# External function and bif calls.
#################################################################

#
# The BIFs erts_internal:check_process_code/1 must be called like a function,
# to ensure that c_p->i (program counter) is set correctly (an ordinary
# BIF call doesn't set it).
#

call_ext u==1 Bif=u$bif:erts_internal:check_process_code/1 => i_call_ext Bif
call_ext_last u==1 Bif=u$bif:erts_internal:check_process_code/1 D => i_call_ext_last Bif D
call_ext_only u==1 Bif=u$bif:erts_internal:check_process_code/1 => i_call_ext_only Bif

#
# The BIFs erts_internal:garbage_collect/1 must be called like a function,
# to allow them to invoke the garbage collector. (The stack pointer must
# be saved and p->arity must be zeroed, which is not done on ordinary BIF calls.)
#
call_ext u==1 Bif=u$bif:erts_internal:garbage_collect/1 => i_call_ext Bif
call_ext_last u==1 Bif=u$bif:erts_internal:garbage_collect/1 D => i_call_ext_last Bif D
call_ext_only u==1 Bif=u$bif:erts_internal:garbage_collect/1 => i_call_ext_only Bif

#
# put/2 and erase/1 must be able to do garbage collection, so we must call
# them like functions.
#

call_ext u==2 Bif=u$bif:erlang:put/2 => i_call_ext Bif
call_ext_last u==2 Bif=u$bif:erlang:put/2 D => i_call_ext_last Bif D
call_ext_only u==2 Bif=u$bif:erlang:put/2 => i_call_ext_only Bif

call_ext u==1 Bif=u$bif:erlang:erase/1 => i_call_ext Bif
call_ext_last u==1 Bif=u$bif:erlang:erase/1 D => i_call_ext_last Bif D
call_ext_only u==1 Bif=u$bif:erlang:erase/1 => i_call_ext_only Bif

#
# The process_info/1,2 BIF should be called like a function, to force
# the emulator to set c_p->current before calling it (a BIF call doesn't
# set it).
#
# In addition, we force the use of a non-tail-recursive call.  This will ensure
# that c_p->cp points into the function making the call.
#

call_ext u==1 Bif=u$bif:erlang:process_info/1 => i_call_ext Bif
call_ext_last u==1 Bif=u$bif:erlang:process_info/1 D => i_call_ext Bif | deallocate_return D
call_ext_only Ar=u==1 Bif=u$bif:erlang:process_info/1 => allocate u Ar | i_call_ext Bif | deallocate_return u

call_ext u==2 Bif=u$bif:erlang:process_info/2 => i_call_ext Bif
call_ext_last u==2 Bif=u$bif:erlang:process_info/2 D => i_call_ext Bif | deallocate_return D
call_ext_only Ar=u==2 Bif=u$bif:erlang:process_info/2 => allocate u Ar | i_call_ext Bif | deallocate_return u

#
# load_nif/2 also needs to know calling function like process_info
#
call_ext u==2 Bif=u$bif:erlang:load_nif/2 => i_call_ext Bif
call_ext_last u==2 Bif=u$bif:erlang:load_nif/2 D => i_call_ext Bif | deallocate_return D
call_ext_only Ar=u==2 Bif=u$bif:erlang:load_nif/2 => allocate u Ar | i_call_ext Bif | deallocate_return u


#
# apply/2 is an instruction, not a BIF.
#

call_ext u==2 u$func:erlang:apply/2 => i_apply_fun
call_ext_last u==2 u$func:erlang:apply/2 D => i_apply_fun_last D
call_ext_only u==2 u$func:erlang:apply/2 => i_apply_fun_only

#
# The apply/3 BIF is an instruction.
#

call_ext u==3 u$bif:erlang:apply/3 => i_apply
call_ext_last u==3 u$bif:erlang:apply/3 D => i_apply_last D
call_ext_only u==3 u$bif:erlang:apply/3 => i_apply_only

#
# The exit/1 and throw/1 BIFs never execute the instruction following them;
# thus there is no need to generate any return instruction.
#

call_ext_last u==1 Bif=u$bif:erlang:exit/1 D => call_bif Bif
call_ext_last u==1 Bif=u$bif:erlang:throw/1 D => call_bif Bif

call_ext_only u==1 Bif=u$bif:erlang:exit/1 => call_bif Bif
call_ext_only u==1 Bif=u$bif:erlang:throw/1 => call_bif Bif

#
# The error/1 and error/2 BIFs never execute the instruction following them;
# thus there is no need to generate any return instruction.
# However, they generate stack backtraces, so if the call instruction
# is call_ext_only/2 instruction, we explicitly do an allocate/2 to store
# the continuation pointer on the stack.
#

call_ext_last u==1 Bif=u$bif:erlang:error/1 D => call_bif Bif
call_ext_last u==2 Bif=u$bif:erlang:error/2 D => call_bif Bif

call_ext_only Ar=u==1 Bif=u$bif:erlang:error/1 => \
  allocate u Ar | call_bif Bif
call_ext_only Ar=u==2 Bif=u$bif:erlang:error/2 => \
  allocate u Ar | call_bif Bif

#
# The yield/0 BIF is an instruction
#

call_ext u==0 u$func:erlang:yield/0 => i_yield
call_ext_last u==0 u$func:erlang:yield/0 D => i_yield | deallocate_return D
call_ext_only u==0 u$func:erlang:yield/0 => i_yield | return

#
# The hibernate/3 BIF is an instruction.
#
call_ext u==3 u$func:erlang:hibernate/3 => i_hibernate
call_ext_last u==3 u$func:erlang:hibernate/3 D => i_hibernate
call_ext_only u==3 u$func:erlang:hibernate/3 => i_hibernate

#
# If VM probes are not enabled, we want to short-circult calls to
# the dt tag BIFs to make them as cheap as possible.
#

%unless USE_VM_PROBES

call_ext Arity u$func:erlang:dt_get_tag/0 => \
    move a=am_undefined x=0
call_ext_last Arity u$func:erlang:dt_get_tag/0 D => \
    move a=am_undefined x=0 | deallocate D | return
call_ext_only Arity u$func:erlang:dt_get_tag/0 => \
    move a=am_undefined x=0 | return

move Any x==0 | call_ext Arity u$func:erlang:dt_put_tag/1 => \
    move a=am_undefined x=0
move Any x==0 | call_ext_last Arity u$func:erlang:dt_put_tag/1 D => \
    move a=am_undefined x=0 | deallocate D | return
move Any x==0 | call_ext_only Arity u$func:erlang:dt_put_tag/1 => \
    move a=am_undefined x=0 | return
call_ext Arity u$func:erlang:dt_put_tag/1 => \
    move a=am_undefined x=0
call_ext_last Arity u$func:erlang:dt_put_tag/1 D => \
    move a=am_undefined x=0 | deallocate D | return
call_ext_only Arity u$func:erlang:dt_put_tag/1 => \
    move a=am_undefined x=0 | return

call_ext Arity u$func:erlang:dt_get_tag_data/0 => \
    move a=am_undefined x=0
call_ext_last Arity u$func:erlang:dt_get_tag_data/0 D => \
    move a=am_undefined x=0 | deallocate D | return
call_ext_only Arity u$func:erlang:dt_get_tag_data/0 => \
    move a=am_undefined x=0 | return

move Any x==0 | call_ext Arity u$func:erlang:dt_spread_tag/1 => \
    move a=am_true x=0
move Any x==0 | call_ext_last Arity u$func:erlang:dt_spread_tag/1 D => \
    move a=am_true x=0 | deallocate D | return
move Any x==0 | call_ext_only Arity u$func:erlang:dt_spread_tag/1 => \
    move a=am_true x=0 | return
call_ext Arity u$func:erlang:dt_spread_tag/1 => \
    move a=am_true x=0
call_ext_last Arity u$func:erlang:dt_spread_tag/1 D => \
    move a=am_true x=0 | deallocate D | return
call_ext_only Arity u$func:erlang:dt_spread_tag/1 => \
    move a=am_true x=0 | return

move Any x==0 | call_ext Arity u$func:erlang:dt_restore_tag/1 => \
    move a=am_true x=0
move Any x==0 | call_ext_last Arity u$func:erlang:dt_restore_tag/1 D => \
    move a=am_true x=0 | deallocate D | return
move Any x==0 | call_ext_only Arity u$func:erlang:dt_restore_tag/1 => \
    move a=am_true x=0 | return
call_ext Arity u$func:erlang:dt_restore_tag/1 => \
    move a=am_true x=0
call_ext_last Arity u$func:erlang:dt_restore_tag/1 D => \
    move a=am_true x=0 | deallocate D | return
call_ext_only Arity u$func:erlang:dt_restore_tag/1 => \
    move a=am_true x=0 | return

move Any x==0 | call_ext Arity u$func:erlang:dt_prepend_vm_tag_data/1 => \
    move Any x=0
move Any x==0 | call_ext_last Arity u$func:erlang:dt_prepend_vm_tag_data/1 D => \
    move Any x=0 | deallocate D | return
move Any x==0 | call_ext_only Arity u$func:erlang:dt_prepend_vm_tag_data/1 => \
    move Any x=0 | return
call_ext Arity u$func:erlang:dt_prepend_vm_tag_data/1 =>
call_ext_last Arity u$func:erlang:dt_prepend_vm_tag_data/1 D => \
    deallocate D | return
call_ext_only Arity u$func:erlang:dt_prepend_vm_tag_data/1 => \
    return

move Any x==0 | call_ext Arity u$func:erlang:dt_append_vm_tag_data/1 => \
    move Any x=0
move Any x==0 | call_ext_last Arity u$func:erlang:dt_append_vm_tag_data/1 D => \
    move Any x=0 | deallocate D | return
move Any x==0 | call_ext_only Arity u$func:erlang:dt_append_vm_tag_data/1 => \
    move Any x=0 | return
call_ext Arity u$func:erlang:dt_append_vm_tag_data/1 =>
call_ext_last Arity u$func:erlang:dt_append_vm_tag_data/1 D => \
    deallocate D | return
call_ext_only Arity u$func:erlang:dt_append_vm_tag_data/1 => \
    return

# Can happen after one of the transformations above.
move Discarded x==0 | move Something x==0 => move Something x=0

%endif

call_ext u==0 u$func:os:perf_counter/0 => \
    i_perf_counter
call_ext_last u==0 u$func:os:perf_counter/0 D => \
    i_perf_counter | deallocate_return D
call_ext_only u==0 u$func:os:perf_counter/0 => \
    i_perf_counter | return

#
# The general case for BIFs that have no special instructions.
# A BIF used in the tail must be followed by a return instruction.
#
# To make trapping and stack backtraces work correctly, we make sure that
# the continuation pointer is always stored on the stack.

call_ext u Bif=u$is_bif => call_bif Bif

call_ext_last u Bif=u$is_bif D => call_bif Bif | deallocate_return D

call_ext_only Ar=u Bif=u$is_bif => \
  allocate u Ar | call_bif Bif | deallocate_return u

#
# Any remaining calls are calls to Erlang functions, not BIFs.
# We rename the instructions to internal names.  This is necessary,
# to avoid an end-less loop, because we want to call a few BIFs
# with call instructions.
#

move S=c x==0 | call_ext Ar=u Func=u$is_not_bif => i_move_call_ext S Func
move S=c x==0 | call_ext_last Ar=u Func=u$is_not_bif D => i_move_call_ext_last Func D S
move S=c x==0 | call_ext_only Ar=u Func=u$is_not_bif => i_move_call_ext_only Func S

call_ext Ar Func        => i_call_ext Func
call_ext_last Ar Func D => i_call_ext_last Func D
call_ext_only Ar Func   => i_call_ext_only Func

i_apply
i_apply_last Q
i_apply_only

i_apply_fun
i_apply_fun_last Q
i_apply_fun_only

%cold
i_hibernate

i_perf_counter
%hot

call_bif e

#
# Calls to non-building and guard BIFs.
#

bif0 u$bif:erlang:self/0 Dst=d => self Dst
bif0 u$bif:erlang:node/0 Dst=d => node Dst

bif1 Fail=f Bif=u$bif:erlang:hd/1 Src=x Dst=x => is_nonempty_list_get_hd Fail Src Dst
bif1 Fail=f Bif=u$bif:erlang:tl/1 Src=x Dst=x => is_nonempty_list_get_tl Fail Src Dst

bif1 Fail Bif=u$bif:erlang:get/1 Src=s Dst=d => gen_get(Src, Dst)

bif2 Jump=j u$bif:erlang:element/2 S1=s S2=xy Dst=d => gen_element(Jump, S1, S2, Dst)

bif1 p Bif S1 Dst         => i_bif1_body S1 Bif Dst
bif1 Fail=f Bif S1 Dst    => i_bif1 S1 Fail Bif Dst

bif2 p Bif S1 S2 Dst      => i_bif2_body S2 S1 Bif Dst
bif2 Fail=f Bif S1 S2 Dst => i_bif2 S2 S1 Fail Bif Dst

i_get_hash c I d
i_get s d

self xy

node x
%cold
node y
%hot

# Note: 'I' is sufficient because this instruction will only be used
# if the arity fits in 24 bits.
i_fast_element xy j? I d

i_element xy j? s d

i_bif1 s f? b d
i_bif1_body s b d
i_bif2 s s f? b d
i_bif2_body s s b d
i_bif3 s s s f? b d
i_bif3_body s s s b d

#
# Internal calls.
#

move S=cxy x==0 | call Ar P=f => move_call S P

move_call/2
move_call cxy f

move S x==0 | call_last Ar P=f D => move_call_last S P D

move_call_last/3
move_call_last cxy f Q

move S=cx x==0 | call_only Ar P=f => move_call_only S P

move_call_only/2
move_call_only cx f

call Ar Func        => i_call Func
call_last Ar Func D => i_call_last Func D
call_only Ar Func   => i_call_only Func

i_call f
i_call_last f Q
i_call_only f

i_call_ext e
i_call_ext_last e Q
i_call_ext_only e

i_move_call_ext c e
i_move_call_ext_last e Q c
i_move_call_ext_only e c

# Fun calls.

call_fun Arity | deallocate D | return => i_call_fun_last Arity D
call_fun Arity => i_call_fun Arity

i_call_fun t
i_call_fun_last t Q

make_fun2 OldIndex=u => gen_make_fun2(OldIndex)

%cold
i_make_fun W t
%hot

is_function f? xy
is_function Fail=f c => jump Fail

func_info M F A => i_func_info u M F A

# ================================================================
# Bit syntax matching obsoleted in OTP 22.
# ================================================================

%cold
bs_start_match2 Fail=f ica X Y D => jump Fail
bs_start_match2 Fail Bin X Y D => i_bs_start_match2 Bin Fail X Y D
i_bs_start_match2 xy f t t d

bs_save2 Y=y Index => move Y x | bs_save2 x Index
bs_save2 Reg Index => gen_bs_save(Reg, Index)
i_bs_save2 x t

bs_restore2 Y=y Index => move Y x | bs_restore2 x Index
bs_restore2 Reg Index => gen_bs_restore(Reg, Index)
i_bs_restore2 x t

bs_context_to_binary Y=y | line L | badmatch Y => \
    move Y x | bs_context_to_binary x | line L | badmatch x
bs_context_to_binary Y=y => move Y x | bs_context_to_binary x
bs_context_to_binary x
%warm

# ================================================================
# New bit syntax matching (R11B).
# ================================================================

%warm

# Matching integers
bs_match_string Fail Ms Bits Val => i_bs_match_string Ms Fail Bits Val

i_bs_match_string xy f W W

# Fetching integers from binaries.
bs_get_integer2 Fail=f Ms=xy Live=u Sz=sq Unit=u Flags=u Dst=d => \
			gen_get_integer2(Fail, Ms, Live, Sz, Unit, Flags, Dst)

i_bs_get_integer_small_imm Ms Bits Fail Flags Y=y => \
   i_bs_get_integer_small_imm Ms Bits Fail Flags x | move x Y

i_bs_get_integer_imm Ms Bits Live Fail Flags Y=y => \
   i_bs_get_integer_imm Ms Bits Live Fail Flags x | move x Y

i_bs_get_integer_small_imm xy W f? t x
i_bs_get_integer_imm xy W t f? t x
i_bs_get_integer xy f? t t s d
i_bs_get_integer_8 xy f? d
i_bs_get_integer_16 xy f? d

%if ARCH_64
i_bs_get_integer_32 xy f? d
%endif

# Fetching binaries from binaries.
bs_get_binary2 Fail=f Ms=xy Live=u Sz=sq Unit=u Flags=u Dst=d => \
			gen_get_binary2(Fail, Ms, Live, Sz, Unit, Flags, Dst)

i_bs_get_binary_imm2 xy f? t W t d
i_bs_get_binary2 xy f t? s t d
i_bs_get_binary_all2 xy f? t t d
i_bs_get_binary_all_reuse xy f? t

# Fetching float from binaries.
bs_get_float2 Fail=f Ms=xy Live=u Sz=s Unit=u Flags=u Dst=d => \
		gen_get_float2(Fail, Ms, Live, Sz, Unit, Flags, Dst)

bs_get_float2 Fail=f Ms=x Live=u Sz=q Unit=u Flags=u Dst=d => jump Fail

i_bs_get_float2 xy f? t s t d

# Miscellanous

bs_skip_bits2 Fail=f Ms=xy Sz=sq Unit=u Flags=u => \
			gen_skip_bits2(Fail, Ms, Sz, Unit, Flags)

i_bs_skip_bits_imm2 f? xy W
i_bs_skip_bits2 xy xy f? t

bs_test_tail2 Fail=f Ms=xy Bits=u==0 => bs_test_zero_tail2 Fail Ms
bs_test_tail2 Fail=f Ms=xy Bits=u => bs_test_tail_imm2 Fail Ms Bits
bs_test_zero_tail2 f? xy
bs_test_tail_imm2 f? xy W

bs_test_unit F Ms Unit=u==8 => bs_test_unit8 F Ms
bs_test_unit f? xy t
bs_test_unit8 f? xy

# Gets a bitstring from the tail of a context.
bs_get_tail xy d t

# New bs_start_match variant for contexts with external position storage.
#
# bs_get/set_position is used to save positions into registers instead of
# "slots" in the context itself, which lets us continue matching even after
# we've passed it off to another function.

%if ARCH_64
bs_start_match3 Fail Bin Live Ctx | bs_get_position Ctx Pos=x Ignored => \
    i_bs_start_match3_gp Bin Live Fail Ctx Pos
i_bs_start_match3_gp xy t f d x
%endif

bs_start_match3 Fail=f ica Live Dst => jump Fail
bs_start_match3 Fail Bin Live Dst => i_bs_start_match3 Bin Live Fail Dst

i_bs_start_match3 xy t f d

# Match context position instructions. 64-bit assumes that all positions can
# fit into an unsigned small.

%if ARCH_64
    bs_get_position Src Dst Live => i_bs_get_position Src Dst
    i_bs_get_position xy xy
    bs_set_position xy xy
%else
    bs_get_position xy d t?
    bs_set_position xy xy
%endif

#
# Utf8/utf16/utf32 support. (R12B-5)
#
bs_get_utf8 Fail=f Ms=xy u u Dst=d => i_bs_get_utf8 Ms Fail Dst
i_bs_get_utf8 xy f? d

bs_skip_utf8 Fail=f Ms=xy u u => i_bs_get_utf8 Ms Fail x

bs_get_utf16 Fail=f Ms=xy u Flags=u Dst=d => i_bs_get_utf16 Ms Fail Flags Dst
bs_skip_utf16 Fail=f Ms=xy u Flags=u => i_bs_get_utf16 Ms Fail Flags x

i_bs_get_utf16 xy f? t d

bs_get_utf32 Fail=f Ms=xy Live=u Flags=u Dst=d => \
	bs_get_integer2 Fail Ms Live i=32 u=1 Flags Dst | \
	i_bs_validate_unicode_retract Fail Dst Ms
bs_skip_utf32 Fail=f Ms=xy Live=u Flags=u => \
	bs_get_integer2 Fail Ms Live i=32 u=1 Flags x | \
	i_bs_validate_unicode_retract Fail x Ms

i_bs_validate_unicode_retract j s S
%hot

#
# Constructing binaries
#
%warm

bs_init2 Fail Sz Words Regs Flags Dst | binary_too_big(Sz) => system_limit Fail

bs_init2 Fail Sz Words Regs Flags Dst=y => \
   bs_init2 Fail Sz Words Regs Flags x | move x Dst

bs_init2 Fail Sz=u Words=u==0 Regs Flags Dst => i_bs_init Sz Regs Dst

bs_init2 Fail Sz=u Words Regs Flags Dst => \
   i_bs_init_heap Sz Words Regs Dst

bs_init2 Fail Sz Words=u==0 Regs Flags Dst => \
  i_bs_init_fail Sz Fail Regs Dst
bs_init2 Fail Sz Words Regs Flags Dst => \
  i_bs_init_fail_heap Sz Words Fail Regs Dst

i_bs_init_fail xy j? t? x

i_bs_init_fail_heap s I j? t? x

i_bs_init W t? x

i_bs_init_heap W I t? x


bs_init_bits Fail Sz=o Words Regs Flags Dst => system_limit Fail
bs_init_bits Fail Sz Words Regs Flags Dst=y => \
   bs_init_bits Fail Sz Words Regs Flags x | move x Dst

bs_init_bits Fail Sz=u Words=u==0 Regs Flags Dst => i_bs_init_bits Sz Regs Dst
bs_init_bits Fail Sz=u Words Regs Flags Dst =>  i_bs_init_bits_heap Sz Words Regs Dst

bs_init_bits Fail Sz Words=u==0 Regs Flags Dst => \
  i_bs_init_bits_fail Sz Fail Regs Dst
bs_init_bits Fail Sz Words Regs Flags Dst => \
  i_bs_init_bits_fail_heap Sz Words Fail Regs Dst

i_bs_init_bits_fail xy j? t? x

i_bs_init_bits_fail_heap s I j? t? x

i_bs_init_bits W t? x
i_bs_init_bits_heap W I t? x

bs_add Fail S1=i==0 S2 Unit=u==1 D => move S2 D

bs_add j? s s t? x

bs_append Fail Size Extra Live Unit Bin Flags Dst => \
  move Bin x | i_bs_append Fail Extra Live Unit Size Dst

bs_private_append Fail Size Unit Bin Flags Dst => \
  i_bs_private_append Fail Unit Size Bin Dst

bs_init_writable

i_bs_append j? I t? t s xy
i_bs_private_append j? t s S x

#
# Storing integers into binaries.
#

bs_put_integer Fail=j Sz=sq Unit=u Flags=u Src=s => \
			gen_put_integer(Fail, Sz, Unit, Flags, Src)

i_new_bs_put_integer j? S t s
i_new_bs_put_integer_imm xyc j? W t

#
# Utf8/utf16/utf32 support. (R12B-5)
#

bs_utf8_size j Src Dst=d => i_bs_utf8_size Src Dst
bs_utf16_size j Src Dst=d => i_bs_utf16_size Src Dst

bs_put_utf8 Fail u Src => i_bs_put_utf8 Fail Src

bs_put_utf32 Fail=j Flags=u Src=s => \
   i_bs_validate_unicode Fail Src | bs_put_integer Fail i=32 u=1 Flags Src

i_bs_utf8_size S x
i_bs_utf16_size S x

i_bs_put_utf8 j? S
bs_put_utf16 j? t S

i_bs_validate_unicode j? S

# Handle unoptimized code.
i_bs_utf8_size Src=c Dst => move Src x | i_bs_utf8_size x Dst
i_bs_utf16_size Src=c Dst => move Src x | i_bs_utf16_size x Dst
i_bs_put_utf8 Fail Src=c => move Src x | i_bs_put_utf8 Fail x
bs_put_utf16 Fail Flags Src=c => move Src x | bs_put_utf16 Fail Flags x
i_bs_validate_unicode Fail Src=c => move Src x | i_bs_validate_unicode Fail x

#
# Storing floats into binaries.
#
bs_put_float Fail Sz=q Unit Flags Val => badarg Fail

bs_put_float Fail=j Sz=s Unit=u Flags=u Src=s => \
			gen_put_float(Fail, Sz, Unit, Flags, Src)

i_new_bs_put_float j? S t s
i_new_bs_put_float_imm j? W t s

#
# Storing binaries into binaries.
#

bs_put_binary Fail=j Sz=s Unit=u Flags=u Src=s => \
			gen_put_binary(Fail, Sz, Unit, Flags, Src)

# In unoptimized code, the binary argument could be a literal. (In optimized code,
# there would be a bs_put_string instruction.)
i_new_bs_put_binary Fail Size Unit Lit=c => \
   move Lit x | i_new_bs_put_binary Fail Size Unit x
i_new_bs_put_binary_imm Fail Size Lit=c => \
   move Lit x | i_new_bs_put_binary_imm Fail Size x
i_new_bs_put_binary_all Lit=c Fail Unit => \
   move Lit x | i_new_bs_put_binary_all x Fail Unit

i_new_bs_put_binary j? S t S
i_new_bs_put_binary_imm j? W S
i_new_bs_put_binary_all xy j? t

#
# Warning: The i_bs_put_string and i_new_bs_put_string instructions
# are specially treated in the loader.
# Don't change the instruction format unless you change the loader too.
#

bs_put_string W W

#
# New floating point instructions (R8).
#

fadd p FR1 FR2 FR3 => i_fadd FR1 FR2 FR3
fsub p FR1 FR2 FR3 => i_fsub FR1 FR2 FR3
fmul p FR1 FR2 FR3 => i_fmul FR1 FR2 FR3
fdiv p FR1 FR2 FR3 => i_fdiv FR1 FR2 FR3
fnegate p FR1 FR2 => i_fnegate FR1 FR2

fconv Arg=iqan Dst=l => move Arg x | fconv x Dst

fmove Arg=l Dst=d => fstore Arg Dst
fmove Arg=dq Dst=l => fload Arg Dst

fstore l d
fload Sq l

fconv S l

i_fadd l l l
i_fsub l l l
i_fmul l l l
i_fdiv l l l
i_fnegate l l

fclearerror | no_fpe_signals() =>
fcheckerror p | no_fpe_signals() =>

%unless NO_FPE_SIGNALS
fcheckerror p => i_fcheckerror

i_fcheckerror
fclearerror
%endif

%hot

#
# New apply instructions in R10B.
#

apply t
apply_last t Q

#
# Handle compatibility with OTP 17 here.
#

i_put_map_assoc/4

# We KNOW that in OTP 20 (actually OTP 18 and higher), a put_map_assoc instruction
# is always preceded by an is_map test. That means that put_map_assoc can never
# fail and does not need any failure label.

put_map_assoc Fail Map Dst Live Size Rest=* | compiled_with_otp_20_or_higher() => \
	      i_put_map_assoc Map Dst Live Size Rest

# Translate the put_map_assoc instruction if the module was compiled by a compiler
# before 20. This is only necessary if the OTP 17 compiler was used, but we
# have no safe and relatively easy way to know whether OTP 18/19 was used.

put_map_assoc Fail=p Map Dst Live Size Rest=* => \
	      ensure_map Map | i_put_map_assoc Map Dst Live Size Rest
put_map_assoc Fail=f Map Dst Live Size Rest=* => \
	      is_map Fail Map | i_put_map_assoc Map Dst Live Size Rest

ensure_map Lit=q | literal_is_map(Lit) =>
ensure_map Src=cqy => move Src x | ensure_map x

%cold
ensure_map x
%hot

#
# Map instructions. First introduced in R17.
#

sorted_put_map_assoc/4
i_put_map_assoc Map Dst Live Size Rest=* | map_key_sort(Size, Rest) => \
  sorted_put_map_assoc Map Dst Live Size Rest

sorted_put_map_exact/5
put_map_exact F Map Dst Live Size Rest=* | map_key_sort(Size, Rest) => \
  sorted_put_map_exact F Map Dst Live Size Rest

sorted_put_map_assoc Map Dst Live Size Rest=* | is_empty_map(Map) => \
   new_map Dst Live Size Rest
sorted_put_map_assoc Src=s Dst Live Size Rest=* => \
	       update_map_assoc Src Dst Live Size Rest
sorted_put_map_assoc Src Dst Live Size Rest=* => \
	       move Src x | update_map_assoc x Dst Live Size Rest

sorted_put_map_exact F Src=s Dst Live Size Rest=* => \
	      update_map_exact F Src Dst Live Size Rest
sorted_put_map_exact F Src Dst Live Size Rest=* => \
	      move Src x | update_map_exact F x Dst Live Size Rest

new_map Dst Live Size Rest=* | is_small_map_literal_keys(Size, Rest) => \
   gen_new_small_map_lit(Dst, Live, Size, Rest)

new_map d t I
i_new_small_map_lit d t q
update_map_assoc s d t I
update_map_exact j? s d t I

is_map Fail Lit=q | literal_is_map(Lit) =>
is_map Fail cq => jump Fail

is_map f? xy

## Transform has_map_fields #{ K1 := _, K2 := _ } to has_map_elements

has_map_fields Fail Src Size Rest=* => \
   gen_has_map_fields(Fail, Src, Size, Rest)

## Transform get_map_elements(s) #{ K1 := V1, K2 := V2 }

get_map_elements Fail Src Size=u==2 Rest=* => \
    gen_get_map_element(Fail, Src, Size, Rest)
get_map_elements Fail Src Size Rest=* | map_key_sort(Size, Rest) => \
   gen_get_map_elements(Fail, Src, Size, Rest)

i_get_map_elements f? s I

i_get_map_element_hash Fail Src=c Key Hash Dst => \
    move Src x | i_get_map_element_hash Fail x Key Hash Dst
i_get_map_element_hash f? xy c I xy

i_get_map_element Fail Src=c Key Dst => \
    move Src x | i_get_map_element Fail x Key Dst
i_get_map_element f? xy xy xy

#
# Convert the plus operations to a generic plus instruction.
#
gen_plus/5
gen_minus/5

gc_bif1 Fail Live u$bif:erlang:splus/1 Src Dst => \
   gen_plus Fail Live Src i Dst
gc_bif2 Fail Live u$bif:erlang:splus/2 S1 S2 Dst => \
   gen_plus Fail Live S1 S2 Dst

gc_bif1 Fail Live u$bif:erlang:sminus/1 Src Dst => \
   gen_minus Fail Live i Src Dst
gc_bif2 Fail Live u$bif:erlang:sminus/2 S1 S2 Dst => \
   gen_minus Fail Live S1 S2 Dst

#
# Optimize addition and subtraction of small literals using
# the i_increment/3 instruction (in bodies, not in guards).
#

gen_plus p Live Int=i Reg=d Dst => \
	gen_increment(Reg, Int, Dst)
gen_plus p Live Reg=d Int=i Dst => \
	gen_increment(Reg, Int, Dst)

gen_minus p Live Reg=d Int=i Dst | negation_is_small(Int) => \
	gen_increment_from_minus(Reg, Int, Dst)

#
# Arithmetic instructions.
#

gen_plus Fail Live S1 S2 Dst => i_plus S1 S2 Fail Dst

gen_minus Fail Live S1 S2 Dst => i_minus S1 S2 Fail Dst

gc_bif2 Fail Live u$bif:erlang:stimes/2 S1 S2 Dst => \
  i_times Fail S1 S2 Dst

gc_bif2 Fail Live u$bif:erlang:div/2 S1 S2 Dst => \
  i_m_div Fail S1 S2 Dst
gc_bif2 Fail Live u$bif:erlang:intdiv/2 S1 S2 Dst => \
  i_int_div Fail S1 S2 Dst

gc_bif2 Fail Live u$bif:erlang:rem/2 S1 S2 Dst => \
  i_rem S1 S2 Fail Dst

gc_bif2 Fail Live u$bif:erlang:bsl/2 S1 S2 Dst => \
  i_bsl S1 S2 Fail Dst
gc_bif2 Fail Live u$bif:erlang:bsr/2 S1 S2 Dst => \
  i_bsr S1 S2 Fail Dst

gc_bif2 Fail Live u$bif:erlang:band/2 S1 S2 Dst => \
  i_band S1 S2 Fail Dst

gc_bif2 Fail Live u$bif:erlang:bor/2 S1 S2 Dst => \
  i_bor Fail S1 S2 Dst

gc_bif2 Fail Live u$bif:erlang:bxor/2 S1 S2 Dst => \
  i_bxor Fail S1 S2 Dst

gc_bif1 Fail Live u$bif:erlang:bnot/1 Src Dst=d => i_int_bnot Fail Src Dst

i_increment rxy W d

i_plus x xy j? d
i_plus s s  j? d

i_minus x x j? d
i_minus s s j? d

i_times j? s s d

i_m_div j? s s d
i_int_div j? s s d

i_rem x x j? d
i_rem s s j? d

i_bsl s s j? d
i_bsr s s j? d

i_band x c j? d
i_band s s j? d

i_bor j? s s d
i_bxor j? s s d

i_int_bnot Fail Src=c Dst => move Src x | i_int_bnot Fail x Dst

i_int_bnot j? S d

#
# Old guard BIFs that creates heap fragments are no longer allowed.
#
bif1 Fail u$bif:erlang:length/1 s d => too_old_compiler
bif1 Fail u$bif:erlang:size/1 s d => too_old_compiler
bif1 Fail u$bif:erlang:abs/1 s d => too_old_compiler
bif1 Fail u$bif:erlang:float/1 s d => too_old_compiler
bif1 Fail u$bif:erlang:round/1 s d => too_old_compiler
bif1 Fail u$bif:erlang:trunc/1 s d => too_old_compiler

#
# Handle the length/1 guard BIF specially to make it trappable.
#

gc_bif1 Fail=j Live u$bif:erlang:length/1 Src Dst => \
   i_length_setup Live Src | i_length Fail Live Dst

i_length_setup t xyc

i_length j? t d

#
# Guard BIFs.
#
gc_bif1 p Live Bif Src Dst           => i_bif1_body Src Bif Dst
gc_bif1 Fail=f Live Bif Src Dst      => i_bif1 Src Fail Bif Dst

gc_bif2 p Live Bif S1 S2 Dst         => i_bif2_body S2 S1 Bif Dst
gc_bif2 Fail=f Live Bif S1 S2 Dst    => i_bif2 S2 S1 Fail Bif Dst

gc_bif3 p Live Bif S1 S2 S3 Dst      => i_bif3_body S3 S2 S1 Bif Dst
gc_bif3 Fail=f Live Bif S1 S2 S3 Dst => i_bif3 S3 S2 S1 Fail Bif Dst

#
# The following instruction is specially handled in beam_load.c
# to produce a user-friendly message if an unsupported guard BIF is
# encountered.
#
unsupported_guard_bif/3
unsupported_guard_bif A B C | never() =>

#
# R13B03
#
on_load

#
# R14A.
#
# Modified in OTP 21 because it turns out that we don't need the
# label after all.
#

recv_mark f => i_recv_mark
i_recv_mark

recv_set Fail | label Lbl | loop_rec Lf Reg => \
   i_recv_set | label Lbl | loop_rec Lf Reg
i_recv_set

#
# OTP 21.
#

build_stacktrace
raw_raise