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

#
# %CopyrightBegin%
#
# Copyright Ericsson AB 1997-2017. 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.
#

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

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 I

test_heap I t

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

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

# 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 f f

i_select_tuple_arity xy f I

i_select_tuple_arity2 xy f A A f f

i_jump_on_val_zero xy f I

i_jump_on_val xy f I I

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

# Old-style catch.
catch y f
catch_end y

# Try/catch.
try Y F => catch Y F
try_case Y => try_end Y
try_end y

try_case_end s

# Destructive set tuple element

set_tuple_element s d P

# Get tuple element

i_get_tuple_element xy P x

%cold
i_get_tuple_element xy P y
%hot

i_get_tuple_element2 x P x
i_get_tuple_element2y x P y y

i_get_tuple_element3 x P x

%cold
is_number f x
is_number f y
%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

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=3 | move Value x=1 | move x=3 x=2 | i_raise

i_raise

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

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_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_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=xy 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 xy x

swap x xy

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

move SD=x D=x | move Src=xy SD=x => move_shift Src SD D
move SD=y D=x | move Src=x  SD=y => move_shift Src SD D
move SD=x D=y | move Src=x  SD=x => move_shift Src SD D

# The transformations above guarantee that the source for
# the second move is not the same as the destination for
# the first move. That means that we can do the moves in
# parallel (fetch both values, then store them) which could
# be faster.

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

move X1=x X2=x | move X3=x X4=x => move2_par X1 X2 X3 X4

move X1=x X2=x | move X3=x Y1=y => move2_par X1 X2 X3 Y1

move S1=x S2=x | move X1=x Y1=y => move2_par S1 S2 X1 Y1

move S1=y S2=x | move X1=x Y1=y => move2_par S1 S2 X1 Y1

move Y1=y X1=x | move S1=x D1=x => move2_par Y1 X1 S1 D1
move S1=x D1=x | move Y1=y X1=x => move2_par S1 D1 Y1 X1

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

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

move_x1 c
move_x2 c

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

move_dup xy x xy

move2_par x y x y
move2_par y x y x
move2_par x x x x

move2_par x x x y

move2_par y x x y

move2_par x x y x
move2_par y x x x

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

# The compiler almost never generates a "move Literal y(Y)" instruction,
# so let's cheat if we encounter one.
move S=n D=y => init D
move S=c D=y => move S x | move x D

move x x
move x y
move y x
move c x
move n x
move y y

# 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 | i_wait_timeout_locked Fail Src
wait_timeout Fail Src => i_wait_timeout Fail Src
i_wait_timeout Fail Src=aiq => gen_literal_timeout(Fail, Src)
i_wait_timeout_locked Fail Src=aiq => gen_literal_timeout_locked(Fail, Src)

label L | wait Fail | smp_already_locked(L) => label L | wait_locked Fail
wait Fail | smp() => 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 f
wait_locked f
wait_unlocked f
i_wait_timeout f I
i_wait_timeout f s
i_wait_timeout_locked f I
i_wait_timeout_locked f s
i_wait_error
i_wait_error_locked

send

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

is_eq_exact Lbl R=xy C=ian => 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 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 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_ne_exact f s s

is_eq f s s

is_ne f s s

#
# Putting things.
#

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/2

i_put_tuple xy I

#
# 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 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 y x 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 y r r
put_list x r r
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
#

normal_exit
continue_exit
apply_bif
call_nif
call_error_handler
error_action_code
return_trace

#
# 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 f xy A

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=y | get_tuple_element Reg=x P2 D2=y | \
   succ(P1, P2) => i_get_tuple_element2y 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 I I

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 F=f x==0 | test_heap I1 I2 => is_nonempty_list_test_heap F I1 I2

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_allocate f rx I t
is_nonempty_list_test_heap f I t
is_nonempty_list_get_list f rx 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 acq Arity => jump Fail
is_function2 Fail=f Fun a => jump Fail

is_function2 f s s

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

allocate_init t I 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 P
i_apply_only

i_apply_fun
i_apply_fun_last P
i_apply_fun_only

i_hibernate

i_perf_counter

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 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 => bif1_body Bif S1 Dst

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

i_get_hash c I d
i_get s d

self xy

node x
%cold
node y
%hot

i_fast_element j x I d
i_fast_element j y I d

i_element j xy s d

bif1 f b s d
bif1_body b s d
i_bif2 f b s s d
i_bif2_body b s s 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 P
i_call_only f

i_call_ext e
i_call_ext_last e P
i_call_ext_only e

i_move_call_ext c e
i_move_call_ext_last e P 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 I
i_call_fun_last I P

make_fun2 OldIndex=u => gen_make_fun2(OldIndex)

%cold
i_make_fun I 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

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

%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 I I x

bs_save2 Reg Index => gen_bs_save(Reg, Index)
i_bs_save2 x I

bs_restore2 Reg Index => gen_bs_restore(Reg, Index)
i_bs_restore2 x I

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

i_bs_match_string x f I I

# Fetching integers from binaries.
bs_get_integer2 Fail=f Ms=x 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 x I f I x
i_bs_get_integer_imm x I I f I x
i_bs_get_integer f I I s s x
i_bs_get_integer_8 x f x
i_bs_get_integer_16 x f x
i_bs_get_integer_32 x f I x

# Fetching binaries from binaries.
bs_get_binary2 Fail=f Ms=x 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 f x I I I x
i_bs_get_binary2 f x I s I x
i_bs_get_binary_all2 f x I I x
i_bs_get_binary_all_reuse x f I

# Fetching float from binaries.
bs_get_float2 Fail=f Ms=x 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 f x I s I x

# Miscellanous

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

i_bs_skip_bits_imm2 f x I
i_bs_skip_bits2 f x xy I
i_bs_skip_bits_all2 f x I

bs_test_tail2 Fail=f Ms=x Bits=u==0 => bs_test_zero_tail2 Fail Ms
bs_test_tail2 Fail=f Ms=x Bits=u => bs_test_tail_imm2 Fail Ms Bits
bs_test_zero_tail2 f x
bs_test_tail_imm2 f x I

bs_test_unit F Ms Unit=u==8 => bs_test_unit8 F Ms
bs_test_unit f x I
bs_test_unit8 f x

# An y register operand for bs_context_to_binary is rare,
# but can happen because of inlining.

bs_context_to_binary Y=y => move Y x | bs_context_to_binary x

bs_context_to_binary x

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

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

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

i_bs_get_utf16 x f I x

bs_get_utf32 Fail=f Ms=x 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=x 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
#
%cold

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

bs_init2 Fail Sz=u Words=u==0 Regs Flags Dst | should_gen_heap_bin(Sz) => \
	i_bs_init_heap_bin Sz Regs 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 | should_gen_heap_bin(Sz) => \
	i_bs_init_heap_bin_heap Sz Words 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 I x

i_bs_init_fail_heap s I j I x

i_bs_init I I x
i_bs_init_heap_bin I I x

i_bs_init_heap I I I x
i_bs_init_heap_bin_heap I I I x


bs_init_bits Fail Sz=o Words Regs Flags Dst => system_limit Fail

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 I x

i_bs_init_bits_fail_heap s I j I x

i_bs_init_bits I I x
i_bs_init_bits_heap I I I x

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

bs_add j s s I 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 I I s x
i_bs_private_append j I 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 I s
i_new_bs_put_integer_imm j I I s

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

bs_utf8_size j Src=s Dst=d => i_bs_utf8_size Src Dst

i_bs_utf8_size s x

bs_utf16_size j Src=s Dst=d => i_bs_utf16_size Src Dst

i_bs_utf16_size s x

bs_put_utf8 Fail u Src=s => i_bs_put_utf8 Fail Src

i_bs_put_utf8 j s

bs_put_utf16 j I s

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_validate_unicode j s

#
# 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 I s
i_new_bs_put_float_imm j I I 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)

i_new_bs_put_binary j s I s
i_new_bs_put_binary_imm j I s
i_new_bs_put_binary_all j s I

#
# 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 I I

%hot

#
# 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 q l
fmove d l
fmove l d

fconv d 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() =>
fcheckerror p => i_fcheckerror

i_fcheckerror
fclearerror

#
# New apply instructions in R10B.
#

apply I
apply_last I P

#
# Map instructions in R17.
#

sorted_put_map_assoc/5
put_map_assoc F Map Dst Live Size Rest=* | map_key_sort(Size, Rest) => \
  sorted_put_map_assoc F 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 j Map Dst Live Size Rest=* | is_empty_map(Map) => \
   new_map Dst Live Size Rest
sorted_put_map_assoc F Src=s Dst Live Size Rest=* => \
	       update_map_assoc F Src Dst Live Size Rest
sorted_put_map_assoc F Src Dst Live Size Rest=* => \
	       move Src x | update_map_assoc F 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 I I
i_new_small_map_lit d I q
update_map_assoc j s d I I
update_map_exact j s d I 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=xy 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 Fail Src=xy Key=y Dst => \
    move Key x | i_get_map_element Fail Src x Dst

i_get_map_element_hash f xy c I xy

i_get_map_element f xy x 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/4 instruction (in bodies, not in guards).
#

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

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

#
# GCing arithmetic instructions.
#

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

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

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

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

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

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

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

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

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

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

i_increment rxy I I d

i_plus j I x xy d
i_plus j I s s d

i_minus j I x x d
i_minus j I s s d

i_times j I s s d

i_m_div j I s s d
i_int_div j I s s d

i_rem j I x x d
i_rem j I s s d

i_bsl j I s s d
i_bsr j I s s d

i_band j I x c d
i_band j I s s d

i_bor j I s s d
i_bxor j I s s d

i_int_bnot j s I 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

#
# Guard BIFs.
#
gc_bif1 Fail I Bif Src Dst => \
	gen_guard_bif1(Fail, I, Bif, Src, Dst)

gc_bif2 Fail I Bif S1 S2 Dst => \
	gen_guard_bif2(Fail, I, Bif, S1, S2, Dst)

gc_bif3 Fail I Bif S1 S2 S3 Dst => \
	gen_guard_bif3(Fail, I, Bif, S1, S2, S3, Dst)

i_gc_bif1 j I s I d

i_gc_bif2 j I I s s d

ii_gc_bif3/7

# A specific instruction can only have 6 operands, so we must
# pass one of the arguments in an x register.
ii_gc_bif3 Fail Bif Live S1 S2 S3 Dst => \
  move S1 x | i_gc_bif3 Fail Bif Live S2 S3 Dst

i_gc_bif3 j I I s s d

#
# 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.
#
recv_mark f

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