1 """Power ISA Decoder second stage
3 based on Anton Blanchard microwatt decode2.vhdl
6 from nmigen
import Module
, Elaboratable
, Signal
, Mux
, Const
, Cat
, Repl
, Record
7 from nmigen
.cli
import rtlil
9 from nmutil
.iocontrol
import RecordObject
10 from nmutil
.extend
import exts
12 from soc
.decoder
.power_decoder
import create_pdecode
13 from soc
.decoder
.power_enums
import (InternalOp
, CryIn
, Function
,
15 LdstLen
, In1Sel
, In2Sel
, In3Sel
,
19 class DecodeA(Elaboratable
):
20 """DecodeA from instruction
22 decodes register RA, whether immediate-zero, implicit and
26 def __init__(self
, dec
):
28 self
.sel_in
= Signal(In1Sel
, reset_less
=True)
29 self
.insn_in
= Signal(32, reset_less
=True)
30 self
.reg_out
= Data(5, name
="reg_a")
31 self
.immz_out
= Signal(reset_less
=True)
32 self
.spr_out
= Data(10, "spr_a")
34 def elaborate(self
, platform
):
38 # select Register A field
39 ra
= Signal(5, reset_less
=True)
40 comb
+= ra
.eq(self
.dec
.RA
)
41 with m
.If((self
.sel_in
== In1Sel
.RA
) |
42 ((self
.sel_in
== In1Sel
.RA_OR_ZERO
) &
43 (ra
!= Const(0, 5)))):
44 comb
+= self
.reg_out
.data
.eq(ra
)
45 comb
+= self
.reg_out
.ok
.eq(1)
47 # zero immediate requested
48 with m
.If((self
.sel_in
== In1Sel
.RA_OR_ZERO
) &
49 (self
.reg_out
.data
== Const(0, 5))):
50 comb
+= self
.immz_out
.eq(1)
52 # decode SPR1 based on instruction type
54 # BC or BCREG: potential implicit register (CTR)
55 with m
.If((op
.internal_op
== InternalOp
.OP_BC
) |
56 (op
.internal_op
== InternalOp
.OP_BCREG
)):
57 with m
.If(~self
.dec
.BO
[2]): # 3.0B p38 BO2=0, use CTR reg
58 comb
+= self
.spr_out
.data
.eq(SPR
.CTR
) # constant: CTR
59 comb
+= self
.spr_out
.ok
.eq(1)
60 # MFSPR or MTSPR: move-from / move-to SPRs
61 with m
.If((op
.internal_op
== InternalOp
.OP_MFSPR
) |
62 (op
.internal_op
== InternalOp
.OP_MTSPR
)):
63 comb
+= self
.spr_out
.data
.eq(self
.dec
.SPR
) # SPR field, XFX
64 comb
+= self
.spr_out
.ok
.eq(1)
71 def __init__(self
, width
, name
):
72 name_ok
= "%s_ok" % name
73 layout
= ((name
, width
), (name_ok
, 1))
74 Record
.__init
__(self
, layout
)
75 self
.data
= getattr(self
, name
) # convenience
76 self
.ok
= getattr(self
, name_ok
) # convenience
77 self
.data
.reset_less
= True # grrr
78 self
.reset_less
= True # grrr
81 return [self
.data
, self
.ok
]
84 class DecodeB(Elaboratable
):
85 """DecodeB from instruction
87 decodes register RB, different forms of immediate (signed, unsigned),
88 and implicit SPRs. register B is basically "lane 2" into the CompUnits.
89 by industry-standard convention, "lane 2" is where fully-decoded
90 immediates are muxed in.
93 def __init__(self
, dec
):
95 self
.sel_in
= Signal(In2Sel
, reset_less
=True)
96 self
.insn_in
= Signal(32, reset_less
=True)
97 self
.reg_out
= Data(5, "reg_b")
98 self
.imm_out
= Data(64, "imm_b")
99 self
.spr_out
= Data(10, "spr_b")
101 def elaborate(self
, platform
):
105 # select Register B field
106 with m
.Switch(self
.sel_in
):
107 with m
.Case(In2Sel
.RB
):
108 comb
+= self
.reg_out
.data
.eq(self
.dec
.RB
)
109 comb
+= self
.reg_out
.ok
.eq(1)
110 with m
.Case(In2Sel
.RS
):
111 comb
+= self
.reg_out
.data
.eq(self
.dec
.RS
) # for M-Form shiftrot
112 comb
+= self
.reg_out
.ok
.eq(1)
113 with m
.Case(In2Sel
.CONST_UI
):
114 comb
+= self
.imm_out
.data
.eq(self
.dec
.UI
)
115 comb
+= self
.imm_out
.ok
.eq(1)
116 with m
.Case(In2Sel
.CONST_SI
): # TODO: sign-extend here?
117 comb
+= self
.imm_out
.data
.eq(
118 exts(self
.dec
.SI
, 16, 64))
119 comb
+= self
.imm_out
.ok
.eq(1)
120 with m
.Case(In2Sel
.CONST_UI_HI
):
121 comb
+= self
.imm_out
.data
.eq(self
.dec
.UI
<<16)
122 comb
+= self
.imm_out
.ok
.eq(1)
123 with m
.Case(In2Sel
.CONST_SI_HI
): # TODO: sign-extend here?
124 comb
+= self
.imm_out
.data
.eq(self
.dec
.SI
<<16)
125 comb
+= self
.imm_out
.data
.eq(
126 exts(self
.dec
.SI
<< 16, 32, 64))
127 comb
+= self
.imm_out
.ok
.eq(1)
128 with m
.Case(In2Sel
.CONST_LI
):
129 comb
+= self
.imm_out
.data
.eq(self
.dec
.LI
<<2)
130 comb
+= self
.imm_out
.ok
.eq(1)
131 with m
.Case(In2Sel
.CONST_BD
):
132 comb
+= self
.imm_out
.data
.eq(self
.dec
.BD
<<2)
133 comb
+= self
.imm_out
.ok
.eq(1)
134 with m
.Case(In2Sel
.CONST_DS
):
135 comb
+= self
.imm_out
.data
.eq(self
.dec
.DS
<<2)
136 comb
+= self
.imm_out
.ok
.eq(1)
137 with m
.Case(In2Sel
.CONST_M1
):
138 comb
+= self
.imm_out
.data
.eq(~
Const(0, 64)) # all 1s
139 comb
+= self
.imm_out
.ok
.eq(1)
140 with m
.Case(In2Sel
.CONST_SH
):
141 comb
+= self
.imm_out
.data
.eq(self
.dec
.sh
)
142 comb
+= self
.imm_out
.ok
.eq(1)
143 with m
.Case(In2Sel
.CONST_SH32
):
144 comb
+= self
.imm_out
.data
.eq(self
.dec
.SH32
)
145 comb
+= self
.imm_out
.ok
.eq(1)
147 # decode SPR2 based on instruction type
149 # BCREG implicitly uses CTR or LR for 2nd reg
150 with m
.If(op
.internal_op
== InternalOp
.OP_BCREG
):
151 with m
.If(self
.dec
.FormXL
.XO
[9]): # 3.0B p38 top bit of XO
152 comb
+= self
.spr_out
.data
.eq(SPR
.CTR
)
154 comb
+= self
.spr_out
.data
.eq(SPR
.LR
)
155 comb
+= self
.spr_out
.ok
.eq(1)
160 class DecodeC(Elaboratable
):
161 """DecodeC from instruction
163 decodes register RC. this is "lane 3" into some CompUnits (not many)
166 def __init__(self
, dec
):
168 self
.sel_in
= Signal(In3Sel
, reset_less
=True)
169 self
.insn_in
= Signal(32, reset_less
=True)
170 self
.reg_out
= Data(5, "reg_c")
172 def elaborate(self
, platform
):
176 # select Register C field
177 with m
.Switch(self
.sel_in
):
178 with m
.Case(In3Sel
.RB
):
179 comb
+= self
.reg_out
.data
.eq(self
.dec
.RB
) # for M-Form shiftrot
180 comb
+= self
.reg_out
.ok
.eq(1)
181 with m
.Case(In3Sel
.RS
):
182 comb
+= self
.reg_out
.data
.eq(self
.dec
.RS
)
183 comb
+= self
.reg_out
.ok
.eq(1)
188 class DecodeOut(Elaboratable
):
189 """DecodeOut from instruction
191 decodes output register RA, RT or SPR
194 def __init__(self
, dec
):
196 self
.sel_in
= Signal(OutSel
, reset_less
=True)
197 self
.insn_in
= Signal(32, reset_less
=True)
198 self
.reg_out
= Data(5, "reg_o")
199 self
.spr_out
= Data(10, "spr_o")
201 def elaborate(self
, platform
):
205 # select Register out field
206 with m
.Switch(self
.sel_in
):
207 with m
.Case(OutSel
.RT
):
208 comb
+= self
.reg_out
.data
.eq(self
.dec
.RT
)
209 comb
+= self
.reg_out
.ok
.eq(1)
210 with m
.Case(OutSel
.RA
):
211 comb
+= self
.reg_out
.data
.eq(self
.dec
.RA
)
212 comb
+= self
.reg_out
.ok
.eq(1)
213 with m
.Case(OutSel
.SPR
):
214 comb
+= self
.spr_out
.data
.eq(self
.dec
.SPR
) # from XFX
215 comb
+= self
.spr_out
.ok
.eq(1)
220 class DecodeRC(Elaboratable
):
221 """DecodeRc from instruction
223 decodes Record bit Rc
225 def __init__(self
, dec
):
227 self
.sel_in
= Signal(RC
, reset_less
=True)
228 self
.insn_in
= Signal(32, reset_less
=True)
229 self
.rc_out
= Data(1, "rc")
231 def elaborate(self
, platform
):
235 # select Record bit out field
236 with m
.Switch(self
.sel_in
):
238 comb
+= self
.rc_out
.data
.eq(self
.dec
.Rc
)
239 comb
+= self
.rc_out
.ok
.eq(1)
241 comb
+= self
.rc_out
.data
.eq(1)
242 comb
+= self
.rc_out
.ok
.eq(1)
243 with m
.Case(RC
.NONE
):
244 comb
+= self
.rc_out
.data
.eq(0)
245 comb
+= self
.rc_out
.ok
.eq(1)
250 class DecodeOE(Elaboratable
):
251 """DecodeOE from instruction
253 decodes OE field: uses RC decode detection which might not be good
255 -- For now, use "rc" in the decode table to decide whether oe exists.
256 -- This is not entirely correct architecturally: For mulhd and
257 -- mulhdu, the OE field is reserved. It remains to be seen what an
258 -- actual POWER9 does if we set it on those instructions, for now we
259 -- test that further down when assigning to the multiplier oe input.
261 def __init__(self
, dec
):
263 self
.sel_in
= Signal(RC
, reset_less
=True)
264 self
.insn_in
= Signal(32, reset_less
=True)
265 self
.oe_out
= Data(1, "oe")
267 def elaborate(self
, platform
):
271 # select OE bit out field
272 with m
.Switch(self
.sel_in
):
274 comb
+= self
.oe_out
.data
.eq(self
.dec
.OE
)
275 comb
+= self
.oe_out
.ok
.eq(1)
279 class DecodeCRIn(Elaboratable
):
280 """Decodes input CR from instruction
282 CR indices - insn fields - (not the data *in* the CR) require only 3
283 bits because they refer to CR0-CR7
286 def __init__(self
, dec
):
288 self
.sel_in
= Signal(CRInSel
, reset_less
=True)
289 self
.insn_in
= Signal(32, reset_less
=True)
290 self
.cr_bitfield
= Data(3, "cr_bitfield")
291 self
.cr_bitfield_b
= Data(3, "cr_bitfield_b")
292 self
.cr_bitfield_o
= Data(3, "cr_bitfield_o")
293 self
.whole_reg
= Signal(reset_less
=True)
295 def elaborate(self
, platform
):
299 comb
+= self
.cr_bitfield
.ok
.eq(0)
300 comb
+= self
.cr_bitfield_b
.ok
.eq(0)
301 comb
+= self
.whole_reg
.eq(0)
302 with m
.Switch(self
.sel_in
):
303 with m
.Case(CRInSel
.NONE
):
304 pass # No bitfield activated
305 with m
.Case(CRInSel
.CR0
):
306 comb
+= self
.cr_bitfield
.data
.eq(0)
307 comb
+= self
.cr_bitfield
.ok
.eq(1)
308 with m
.Case(CRInSel
.BI
):
309 comb
+= self
.cr_bitfield
.data
.eq(self
.dec
.BI
[2:5])
310 comb
+= self
.cr_bitfield
.ok
.eq(1)
311 with m
.Case(CRInSel
.BFA
):
312 comb
+= self
.cr_bitfield
.data
.eq(self
.dec
.FormX
.BFA
)
313 comb
+= self
.cr_bitfield
.ok
.eq(1)
314 with m
.Case(CRInSel
.BA_BB
):
315 comb
+= self
.cr_bitfield
.data
.eq(self
.dec
.BA
[2:5])
316 comb
+= self
.cr_bitfield
.ok
.eq(1)
317 comb
+= self
.cr_bitfield_b
.data
.eq(self
.dec
.BB
[2:5])
318 comb
+= self
.cr_bitfield_b
.ok
.eq(1)
319 comb
+= self
.cr_bitfield_o
.data
.eq(self
.dec
.BT
[2:5])
320 comb
+= self
.cr_bitfield_o
.ok
.eq(1)
321 with m
.Case(CRInSel
.BC
):
322 comb
+= self
.cr_bitfield
.data
.eq(self
.dec
.BC
[2:5])
323 comb
+= self
.cr_bitfield
.ok
.eq(1)
324 with m
.Case(CRInSel
.WHOLE_REG
):
325 comb
+= self
.whole_reg
.eq(1)
330 class DecodeCROut(Elaboratable
):
331 """Decodes input CR from instruction
333 CR indices - insn fields - (not the data *in* the CR) require only 3
334 bits because they refer to CR0-CR7
337 def __init__(self
, dec
):
339 self
.rc_in
= Signal(reset_less
=True)
340 self
.sel_in
= Signal(CROutSel
, reset_less
=True)
341 self
.insn_in
= Signal(32, reset_less
=True)
342 self
.cr_bitfield
= Data(3, "cr_bitfield")
343 self
.whole_reg
= Signal(reset_less
=True)
345 def elaborate(self
, platform
):
349 comb
+= self
.cr_bitfield
.ok
.eq(0)
350 comb
+= self
.whole_reg
.eq(0)
351 with m
.Switch(self
.sel_in
):
352 with m
.Case(CROutSel
.NONE
):
353 pass # No bitfield activated
354 with m
.Case(CROutSel
.CR0
):
355 comb
+= self
.cr_bitfield
.data
.eq(0)
356 comb
+= self
.cr_bitfield
.ok
.eq(self
.rc_in
) # only when RC=1
357 with m
.Case(CROutSel
.BF
):
358 comb
+= self
.cr_bitfield
.data
.eq(self
.dec
.FormX
.BF
[0:-1])
359 comb
+= self
.cr_bitfield
.ok
.eq(1)
360 with m
.Case(CROutSel
.BT
):
361 comb
+= self
.cr_bitfield
.data
.eq(self
.dec
.FormXL
.BT
[2:5])
362 comb
+= self
.cr_bitfield
.ok
.eq(1)
363 with m
.Case(CROutSel
.WHOLE_REG
):
364 comb
+= self
.whole_reg
.eq(1)
371 self
.ca
= Signal(2, reset_less
=True)
372 self
.ov
= Signal(2, reset_less
=True)
373 self
.so
= Signal(reset_less
=True)
376 return [self
.ca
, self
.ov
, self
.so
]
379 class Decode2ToExecute1Type(RecordObject
):
381 def __init__(self
, name
=None):
383 RecordObject
.__init
__(self
, name
=name
)
385 self
.valid
= Signal(reset_less
=True)
386 self
.insn_type
= Signal(InternalOp
, reset_less
=True)
387 self
.fn_unit
= Signal(Function
, reset_less
=True)
388 self
.nia
= Signal(64, reset_less
=True)
389 self
.write_reg
= Data(5, name
="rego")
390 self
.read_reg1
= Data(5, name
="reg1")
391 self
.read_reg2
= Data(5, name
="reg2")
392 self
.read_reg3
= Data(5, name
="reg3")
393 self
.imm_data
= Data(64, name
="imm")
394 self
.write_spr
= Data(10, name
="spro")
395 self
.read_spr1
= Data(10, name
="spr1")
396 self
.read_spr2
= Data(10, name
="spr2")
398 self
.read_cr1
= Data(3, name
="cr_in1")
399 self
.read_cr2
= Data(3, name
="cr_in2")
400 self
.read_cr3
= Data(3, name
="cr_in2")
401 self
.read_cr_whole
= Signal(reset_less
=True)
402 self
.write_cr
= Data(3, name
="cr_out")
403 self
.write_cr_whole
= Signal(reset_less
=True)
404 #self.read_data1 = Signal(64, reset_less=True)
405 #self.read_data2 = Signal(64, reset_less=True)
406 #self.read_data3 = Signal(64, reset_less=True)
407 #self.cr = Signal(32, reset_less=True) # NO: this is from the CR SPR
408 #self.xerc = XerBits() # NO: this is from the XER SPR
409 self
.lk
= Signal(reset_less
=True)
410 self
.rc
= Data(1, "rc")
411 self
.oe
= Data(1, "oe")
412 self
.invert_a
= Signal(reset_less
=True)
413 self
.zero_a
= Signal(reset_less
=True)
414 self
.invert_out
= Signal(reset_less
=True)
415 self
.input_carry
= Signal(CryIn
, reset_less
=True)
416 self
.output_carry
= Signal(reset_less
=True)
417 self
.input_cr
= Signal(reset_less
=True) # instr. has a CR as input
418 self
.output_cr
= Signal(reset_less
=True) # instr. has a CR as output
419 self
.is_32bit
= Signal(reset_less
=True)
420 self
.is_signed
= Signal(reset_less
=True)
421 self
.insn
= Signal(32, reset_less
=True)
422 self
.data_len
= Signal(4, reset_less
=True) # bytes
423 self
.byte_reverse
= Signal(reset_less
=True)
424 self
.sign_extend
= Signal(reset_less
=True)# do we need this?
425 self
.update
= Signal(reset_less
=True) # LD/ST is "update" variant
428 class PowerDecode2(Elaboratable
):
430 def __init__(self
, dec
):
433 self
.e
= Decode2ToExecute1Type()
436 return self
.dec
.ports() + self
.e
.ports()
438 def elaborate(self
, platform
):
442 # set up submodule decoders
443 m
.submodules
.dec
= self
.dec
444 m
.submodules
.dec_a
= dec_a
= DecodeA(self
.dec
)
445 m
.submodules
.dec_b
= dec_b
= DecodeB(self
.dec
)
446 m
.submodules
.dec_c
= dec_c
= DecodeC(self
.dec
)
447 m
.submodules
.dec_o
= dec_o
= DecodeOut(self
.dec
)
448 m
.submodules
.dec_rc
= dec_rc
= DecodeRC(self
.dec
)
449 m
.submodules
.dec_oe
= dec_oe
= DecodeOE(self
.dec
)
450 m
.submodules
.dec_cr_in
= dec_cr_in
= DecodeCRIn(self
.dec
)
451 m
.submodules
.dec_cr_out
= dec_cr_out
= DecodeCROut(self
.dec
)
453 # copy instruction through...
454 for i
in [self
.e
.insn
, dec_a
.insn_in
, dec_b
.insn_in
,
455 dec_c
.insn_in
, dec_o
.insn_in
, dec_rc
.insn_in
,
456 dec_oe
.insn_in
, dec_cr_in
.insn_in
, dec_cr_out
.insn_in
]:
457 comb
+= i
.eq(self
.dec
.opcode_in
)
459 # ...and subdecoders' input fields
460 comb
+= dec_a
.sel_in
.eq(self
.dec
.op
.in1_sel
)
461 comb
+= dec_b
.sel_in
.eq(self
.dec
.op
.in2_sel
)
462 comb
+= dec_c
.sel_in
.eq(self
.dec
.op
.in3_sel
)
463 comb
+= dec_o
.sel_in
.eq(self
.dec
.op
.out_sel
)
464 comb
+= dec_rc
.sel_in
.eq(self
.dec
.op
.rc_sel
)
465 comb
+= dec_oe
.sel_in
.eq(self
.dec
.op
.rc_sel
) # XXX should be OE sel
466 comb
+= dec_cr_in
.sel_in
.eq(self
.dec
.op
.cr_in
)
467 comb
+= dec_cr_out
.sel_in
.eq(self
.dec
.op
.cr_out
)
468 comb
+= dec_cr_out
.rc_in
.eq(dec_rc
.rc_out
.data
)
470 # decode LD/ST length
471 with m
.Switch(self
.dec
.op
.ldst_len
):
472 with m
.Case(LdstLen
.is1B
):
473 comb
+= self
.e
.data_len
.eq(1)
474 with m
.Case(LdstLen
.is2B
):
475 comb
+= self
.e
.data_len
.eq(2)
476 with m
.Case(LdstLen
.is4B
):
477 comb
+= self
.e
.data_len
.eq(4)
478 with m
.Case(LdstLen
.is8B
):
479 comb
+= self
.e
.data_len
.eq(8)
481 comb
+= self
.e
.nia
.eq(0) # XXX TODO
482 comb
+= self
.e
.valid
.eq(0) # XXX TODO
483 fu
= self
.dec
.op
.function_unit
484 itype
= Mux(fu
== Function
.NONE
,
485 InternalOp
.OP_ILLEGAL
,
486 self
.dec
.op
.internal_op
)
487 comb
+= self
.e
.insn_type
.eq(itype
)
488 comb
+= self
.e
.fn_unit
.eq(fu
)
490 # registers a, b, c and out
491 comb
+= self
.e
.read_reg1
.eq(dec_a
.reg_out
)
492 comb
+= self
.e
.read_reg2
.eq(dec_b
.reg_out
)
493 comb
+= self
.e
.read_reg3
.eq(dec_c
.reg_out
)
494 comb
+= self
.e
.write_reg
.eq(dec_o
.reg_out
)
495 comb
+= self
.e
.imm_data
.eq(dec_b
.imm_out
) # immediate in RB (usually)
496 comb
+= self
.e
.zero_a
.eq(dec_a
.immz_out
) # RA==0 detected
499 comb
+= self
.e
.rc
.eq(dec_rc
.rc_out
)
500 comb
+= self
.e
.oe
.eq(dec_oe
.oe_out
)
503 comb
+= self
.e
.read_spr1
.eq(dec_a
.spr_out
)
504 comb
+= self
.e
.read_spr2
.eq(dec_b
.spr_out
)
505 comb
+= self
.e
.write_spr
.eq(dec_o
.spr_out
)
507 comb
+= self
.e
.read_cr1
.eq(dec_cr_in
.cr_bitfield
)
508 comb
+= self
.e
.read_cr2
.eq(dec_cr_in
.cr_bitfield_b
)
509 comb
+= self
.e
.read_cr3
.eq(dec_cr_in
.cr_bitfield_o
)
510 comb
+= self
.e
.read_cr_whole
.eq(dec_cr_in
.whole_reg
)
512 comb
+= self
.e
.write_cr
.eq(dec_cr_out
.cr_bitfield
)
513 comb
+= self
.e
.write_cr_whole
.eq(dec_cr_out
.whole_reg
)
515 # decoded/selected instruction flags
516 comb
+= self
.e
.invert_a
.eq(self
.dec
.op
.inv_a
)
517 comb
+= self
.e
.invert_out
.eq(self
.dec
.op
.inv_out
)
518 comb
+= self
.e
.input_carry
.eq(self
.dec
.op
.cry_in
) # carry comes in
519 comb
+= self
.e
.output_carry
.eq(self
.dec
.op
.cry_out
) # carry goes out
520 comb
+= self
.e
.is_32bit
.eq(self
.dec
.op
.is_32b
)
521 comb
+= self
.e
.is_signed
.eq(self
.dec
.op
.sgn
)
522 with m
.If(self
.dec
.op
.lk
):
523 comb
+= self
.e
.lk
.eq(self
.dec
.LK
) # XXX TODO: accessor
525 comb
+= self
.e
.byte_reverse
.eq(self
.dec
.op
.br
)
526 comb
+= self
.e
.sign_extend
.eq(self
.dec
.op
.sgn_ext
)
527 comb
+= self
.e
.update
.eq(self
.dec
.op
.upd
) # LD/ST "update" mode
531 # These should be removed eventually
532 comb
+= self
.e
.input_cr
.eq(self
.dec
.op
.cr_in
) # condition reg comes in
533 comb
+= self
.e
.output_cr
.eq(self
.dec
.op
.cr_out
) # condition reg goes in
539 if __name__
== '__main__':
540 pdecode
= create_pdecode()
541 dec2
= PowerDecode2(pdecode
)
542 vl
= rtlil
.convert(dec2
, ports
=dec2
.ports() + pdecode
.ports())
543 with
open("dec2.il", "w") as f
: