source: src/common/FrontEndOps.ma @ 1624

Last change on this file since 1624 was 1545, checked in by campbell, 9 years ago

Use pointer record in front-end.
File size: 17.6 KB
Line 
1(* Operations common to the Cminor and RTLabs front end stages. *)
2
3(* Adapted from CompCert's Cminor.ma: *)
4
5(* *********************************************************************)
6(*                                                                     *)
7(*              The Compcert verified compiler                         *)
8(*                                                                     *)
9(*          Xavier Leroy, INRIA Paris-Rocquencourt                     *)
10(*                                                                     *)
11(*  Copyright Institut National de Recherche en Informatique et en     *)
12(*  Automatique.  All rights reserved.  This file is distributed       *)
13(*  under the terms of the GNU General Public License as published by  *)
14(*  the Free Software Foundation, either version 2 of the License, or  *)
15(*  (at your option) any later version.  This file is also distributed *)
16(*  under the terms of the INRIA Non-Commercial License Agreement.     *)
17(*                                                                     *)
18(* *********************************************************************)
19
20include "common/Values.ma".
21
22inductive constant : Type[0] ≝
23  | Ointconst: ∀sz. bvint sz → constant    (**r integer constant *)
24  | Ofloatconst: float → constant          (**r floating-point constant *)
25  | Oaddrsymbol: ident → nat → constant    (**r address of the symbol plus the offset *)
26  | Oaddrstack: nat → constant.            (**r stack pointer plus the given offset *)
27
28definition boolsrc : typ → Prop ≝ λt. match t with [ ASTint _ _ ⇒ True | ASTptr _ ⇒ True | _ ⇒ False ].
29
30inductive unary_operation : typ → typ → Type[0] ≝
31  | Ocastint: ∀sz,sg,sz',sg'. unary_operation (ASTint sz sg) (ASTint sz' sg')  (**r integer casts *)
32  | Onegint:  ∀sz,sg. unary_operation (ASTint sz sg) (ASTint sz sg)            (**r integer opposite *)
33  | Onotbool: ∀t,sz,sg. boolsrc t → unary_operation t (ASTint sz sg)           (**r boolean negation  *)
34  | Onotint:  ∀sz,sg. unary_operation (ASTint sz sg) (ASTint sz sg)            (**r bitwise complement  *)
35  | Onegf: ∀sz. unary_operation (ASTfloat sz) (ASTfloat sz)                    (**r float opposite *)
36  | Oabsf: ∀sz. unary_operation (ASTfloat sz) (ASTfloat sz)                    (**r float absolute value *)
37  | Osingleoffloat: unary_operation (ASTfloat F64) (ASTfloat F32)              (**r float truncation *)
38  | Ointoffloat:  ∀fsz,sz. unary_operation (ASTfloat fsz) (ASTint sz Signed)   (**r signed integer to float *)
39  | Ointuoffloat: ∀fsz,sz. unary_operation (ASTfloat fsz) (ASTint sz Unsigned) (**r unsigned integer to float *)
40  | Ofloatofint:  ∀fsz,sz. unary_operation (ASTint sz Signed) (ASTfloat fsz)   (**r float to signed integer *)
41  | Ofloatofintu: ∀fsz,sz. unary_operation (ASTint sz Unsigned) (ASTfloat fsz) (**r float to unsigned integer *)
42  | Oid: ∀t. unary_operation t t                                               (**r identity (used to move between registers *)
43  | Optrofint: ∀sz,sg,r. unary_operation (ASTint sz sg) (ASTptr r)             (**r int to pointer with given representation *)
44  | Ointofptr: ∀sz,sg,r. unary_operation (ASTptr r) (ASTint sz sg).            (**r pointer to int *)
45
46inductive binary_operation : Type[0] ≝
47  | Oadd: binary_operation                 (**r integer addition *)
48  | Osub: binary_operation                 (**r integer subtraction *)
49  | Omul: binary_operation                 (**r integer multiplication *)
50  | Odiv: binary_operation                 (**r integer signed division *)
51  | Odivu: binary_operation                (**r integer unsigned division *)
52  | Omod: binary_operation                 (**r integer signed modulus *)
53  | Omodu: binary_operation                (**r integer unsigned modulus *)
54  | Oand: binary_operation                 (**r bitwise ``and'' *)
55  | Oor: binary_operation                  (**r bitwise ``or'' *)
56  | Oxor: binary_operation                 (**r bitwise ``xor'' *)
57  | Oshl: binary_operation                 (**r left shift *)
58  | Oshr: binary_operation                 (**r right signed shift *)
59  | Oshru: binary_operation                (**r right unsigned shift *)
60  | Oaddf: binary_operation                (**r float addition *)
61  | Osubf: binary_operation                (**r float subtraction *)
62  | Omulf: binary_operation                (**r float multiplication *)
63  | Odivf: binary_operation                (**r float division *)
64  | Ocmp: comparison -> binary_operation   (**r integer signed comparison *)
65  | Ocmpu: comparison -> binary_operation  (**r integer unsigned comparison *)
66  | Ocmpf: comparison -> binary_operation  (**r float comparison *)
67  | Oaddp: binary_operation                (**r add an integer to a pointer *)
68  | Osubpi: binary_operation               (**r subtract int from a pointers *)
69  | Osubpp: intsize → binary_operation     (**r subtract two pointers *)
70  | Ocmpp: comparison → binary_operation.  (**r compare pointers *)
71
72
73(* * Evaluation of constants and operator applications.
74    [None] is returned when the computation is undefined, e.g.
75    if arguments are of the wrong types, or in case of an integer division
76    by zero. *)
77
78definition eval_constant : (ident → option block) → block → constant → option val ≝
79λfind_symbol,sp,cst.
80  match cst with
81  [ Ointconst sz n ⇒ Some ? (Vint sz n)
82  | Ofloatconst n ⇒ Some ? (Vfloat n)
83  | Oaddrsymbol s ofs ⇒
84      match find_symbol s with
85      [ None ⇒ None ?
86      | Some b ⇒ Some ? (Vptr (mk_pointer Any b (match b with [ mk_block r id ⇒ universal_compat r id ]) (shift_offset ? zero_offset (repr I16 ofs))))
87      ]
88  | Oaddrstack ofs ⇒
89      Some ? (Vptr (mk_pointer Any sp ? (shift_offset ? zero_offset (repr I16 ofs))))
90  ]. cases sp // qed.
91
92definition eval_unop : ∀t,t'. unary_operation t t' → val → option val ≝
93λt,t',op,arg.
94  match op with
95  [ Ocastint sz sg sz' sg' ⇒
96      match sg with
97      [ Unsigned ⇒ Some ? (zero_ext sz' arg)
98      |   Signed ⇒ Some ? (sign_ext sz' arg)
99      ]
100  | Onegint sz sg ⇒ match arg with [ Vint sz1 n1 ⇒ Some ? (Vint sz1 (two_complement_negation ? n1)) | _ ⇒ None ? ]
101  | Onotbool t sz sg _ ⇒
102      match arg with
103      [ Vint sz1 n1 ⇒ Some ? (Vint sz (if (eq_bv ? n1 (zero ?)) then (repr ? 1) else (zero ?)))
104      | Vptr _ ⇒ Some ? (Vint sz (zero ?))
105      | Vnull _ ⇒ Some ? (Vint sz (repr ? 1))
106      | _ ⇒ None ?
107      ]
108  | Onotint sz sg ⇒ match arg with [ Vint sz1 n1 ⇒ Some ? (Vint sz1 (exclusive_disjunction_bv ? n1 (mone ?))) | _ ⇒ None ? ]
109  | Onegf _ ⇒ match arg with [ Vfloat f1 ⇒ Some ? (Vfloat (Fneg f1)) | _ ⇒ None ? ]
110  | Oabsf _ ⇒ match arg with [ Vfloat f1 ⇒ Some ? (Vfloat (Fabs f1)) | _ ⇒ None ? ]
111  | Osingleoffloat ⇒ Some ? (singleoffloat arg)
112  | Ointoffloat _ sz ⇒ match arg with [ Vfloat f1 ⇒ Some ? (Vint sz (intoffloat ? f1)) | _ ⇒ None ? ]
113  | Ointuoffloat _ sz ⇒ match arg with [ Vfloat f1 ⇒ Some ? (Vint sz (intuoffloat ? f1)) | _ ⇒ None ? ]
114  | Ofloatofint _ _ ⇒ match arg with [ Vint sz1 n1 ⇒ Some ? (Vfloat (floatofint ? n1)) | _ ⇒ None ? ]
115  | Ofloatofintu _ _ ⇒ match arg with [ Vint sz1 n1 ⇒ Some ? (Vfloat (floatofintu ? n1)) | _ ⇒ None ? ]
116  | Oid t ⇒ Some ? arg (* XXX should we restricted the values allowed? *)
117  (* Only conversion of null pointers is specified. *)
118  | Optrofint sz sg r ⇒ match arg with [ Vint sz1 n1 ⇒ if eq_bv ? n1 (zero ?) then Some ? (Vnull r) else None ? | _ ⇒ None ? ]
119  | Ointofptr sz sg r ⇒ match arg with [ Vnull _ ⇒ Some ? (Vint sz (zero ?)) | _ ⇒ None ? ]
120  ].
121
122lemma elim_val_typ : ∀v,t. ∀P:val → Prop.
123val_typ v t →
124match t with
125[ ASTint sz sg ⇒ ∀i.P (Vint sz i)
126| ASTfloat sz ⇒ ∀f.P (Vfloat f)
127| ASTptr r ⇒ P (Vnull r) ∧ ∀b,c,o. P (Vptr (mk_pointer r b c o))
128] →
129P v.
130#v #t #P *
131[ 1,2: //
132| #r * //
133| #r #b #c #o * //
134] qed.
135
136lemma eval_unop_typ_correct : ∀t,t',op,v,v'.
137  val_typ v t →
138  eval_unop t t' op v = Some ? v' →
139  val_typ v' t'.
140#t #t' #op elim op
141[ #sz #sg #sz' #sg' #v #v' #H @(elim_val_typ … H) #i whd in ⊢ (??%? → ?);
142  cases sg whd in ⊢ (??%? → ?); #E' destruct %
143| #sz #sg #v #v' #H @(elim_val_typ … H) #i whd in ⊢ (??%? → ?); #E' destruct %
144| #t'' #sz #sg cases t''
145  [ #sz' #sg' #H #v #v' #H1 @(elim_val_typ … H1) #i whd in ⊢ (??%? → ?); #E' destruct cases (eq_bv ???) whd in ⊢ (?%?); %
146  | #r #H #v #v' #H1 @(elim_val_typ … H1) whd %
147    [ whd in ⊢ (??%? → ?); #E' destruct; %
148    | #b #c #o whd in ⊢ (??%? → ?); #E' destruct %
149    ]
150  | #f *
151  ]
152| #sz #sg #v #v' #H @(elim_val_typ … H) #i whd in ⊢ (??%? → ?); #E destruct %
153| #sz #v #v' #H @(elim_val_typ … H) #f whd in ⊢ (??%? → ?); #E destruct %2
154| #sz #v #v' #H @(elim_val_typ … H) #f whd in ⊢ (??%? → ?); #E destruct %2
155| #v #v' #H @(elim_val_typ … H) #f whd in ⊢ (??%? → ?); #E destruct %2
156| #fsz #sz #v #v' #H @(elim_val_typ … H) #f whd in ⊢ (??%? → ?); #E destruct %
157| #fsz #sz #v #v' #H @(elim_val_typ … H) #f whd in ⊢ (??%? → ?); #E destruct %
158| #fsz #sz #v #v' #H @(elim_val_typ … H) #i whd in ⊢ (??%? → ?); #E destruct %2
159| #fsz #sz #v #v' #H @(elim_val_typ … H) #i whd in ⊢ (??%? → ?); #E destruct %2
160| #t'' #v #v' #H whd in ⊢ (??%? → ?); #E destruct @H
161| #sz #sg #r #v #v' #H @(elim_val_typ … H) #i whd in ⊢ (??%? → ?); cases (eq_bv ???)
162  whd in ⊢ (??%? → ?); #E destruct //
163| #sz #sg #r #v #v' #H @(elim_val_typ … H) %
164  [ whd in ⊢ (??%? → ?); #E destruct %
165  | #b #c #o whd in ⊢ (??%? → ?); #E destruct
166  ]
167] qed.
168 
169(* I think this is duplicated somewhere else *)
170definition eval_compare_mismatch : comparison → option val ≝
171λc. match c with [ Ceq ⇒ Some ? Vfalse | Cne ⇒ Some ? Vtrue | _ ⇒ None ? ].
172
173(* Individual operations, adapted from Values.  These differ in that they
174   implement the plain Cminor/RTLabs operations (e.g., with separate addition
175   for ints,floats and pointers) and use option rather than Vundef.  The ones
176   in Value are probably not needed. *)
177
178definition ev_add ≝ λv1,v2: val.
179  match v1 with
180  [ Vint sz1 n1 ⇒ match v2 with
181    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
182                    (λn1. Some ? (Vint ? (addition_n ? n1 n2)))
183                    (None ?)
184    | _ ⇒ None ? ]
185  | _ ⇒ None ? ].
186
187definition ev_sub ≝ λv1,v2: val.
188  match v1 with
189  [ Vint sz1 n1 ⇒ match v2 with
190    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
191                    (λn1. Some ? (Vint ? (subtraction ? n1 n2)))
192                    (None ?)
193    | _ ⇒ None ? ]
194  | _ ⇒ None ? ].
195
196(* NB: requires arguments to be presented pointer first. *)
197definition ev_addp ≝ λv1,v2: val.
198  match v1 with
199  [ Vptr ptr1 ⇒ match v2 with
200    [ Vint sz2 n2 ⇒ Some ? (Vptr (shift_pointer ? ptr1 n2))
201    | _ ⇒ None ? ]
202  | Vnull r ⇒ match v2 with
203    [ Vint sz2 n2 ⇒ if eq_bv ? n2 (zero ?) then Some ? (Vnull r) else None ?
204    | _ ⇒ None ?
205    ]
206  | _ ⇒ None ? ].
207
208definition ev_subpi ≝ λv1,v2: val.
209  match v1 with
210  [ Vptr ptr1 ⇒ match v2 with
211    [ Vint sz2 n2 ⇒ Some ? (Vptr (neg_shift_pointer ? ptr1 n2))
212    | _ ⇒ None ? ]
213  | Vnull r ⇒ match v2 with [ Vint sz2 n2 ⇒ if eq_bv ? n2 (zero ?) then Some ? (Vnull r) else None ? | _ ⇒ None ? ]
214  | _ ⇒ None ? ].
215
216definition ev_subpp ≝ λsz. λv1,v2: val.
217  match v1 with
218  [ Vptr ptr1 ⇒ match v2 with
219    [ Vptr ptr2 ⇒
220        if eq_block (pblock ptr1) (pblock ptr2)
221          then Some ? (Vint sz (sub_offset ? (poff ptr1) (poff ptr2)))
222          else None ?
223    | _ ⇒ None ? ]
224  | Vnull r ⇒ match v2 with [ Vnull r' ⇒ Some ? (Vint sz (zero ?)) | _ ⇒ None ? ]
225  | _ ⇒ None ? ].
226
227definition ev_mul ≝ λv1, v2: val.
228  match v1 with
229  [ Vint sz1 n1 ⇒ match v2 with
230    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
231                    (λn1. Some ? (Vint ? (\snd (split … (multiplication ? n1 n2)))))
232                    (None ?)
233    | _ ⇒ None ? ]
234  | _ ⇒ None ? ].
235
236definition ev_divs ≝ λv1, v2: val.
237  match v1 with
238  [ Vint sz1 n1 ⇒ match v2 with
239    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
240                    (λn1. option_map ?? (Vint ?) (division_s ? n1 n2))
241                    (None ?)
242    | _ ⇒ None ? ]
243  | _ ⇒ None ? ].
244
245definition ev_mods ≝ λv1, v2: val.
246  match v1 with
247  [ Vint sz1 n1 ⇒ match v2 with
248    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
249                    (λn1. option_map ?? (Vint ?) (modulus_s ? n1 n2))
250                    (None ?)
251    | _ ⇒ None ?
252    ]
253  | _ ⇒ None ?
254  ].
255
256definition ev_divu ≝ λv1, v2: val.
257  match v1 with
258  [ Vint sz1 n1 ⇒ match v2 with
259    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
260                    (λn1. option_map ?? (Vint ?) (division_u ? n1 n2))
261                    (None ?)
262    | _ ⇒ None ?
263    ]
264  | _ ⇒ None ?
265  ].
266
267definition ev_modu ≝ λv1, v2: val.
268  match v1 with
269  [ Vint sz1 n1 ⇒ match v2 with
270    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
271                    (λn1. option_map ?? (Vint ?) (modulus_u ? n1 n2))
272                    (None ?)
273    | _ ⇒ None ?
274    ]
275  | _ ⇒ None ?
276  ].
277
278definition ev_and ≝ λv1, v2: val.
279  match v1 with
280  [ Vint sz1 n1 ⇒ match v2 with
281    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
282                    (λn1. Some ? (Vint ? (conjunction_bv ? n1 n2)))
283                    (None ?)
284    | _ ⇒ None ? ]
285  | _ ⇒ None ? ].
286
287definition ev_or ≝ λv1, v2: val.
288  match v1 with
289  [ Vint sz1 n1 ⇒ match v2 with
290    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
291                    (λn1. Some ? (Vint ? (inclusive_disjunction_bv ? n1 n2)))
292                    (None ?)
293    | _ ⇒ None ? ]
294  | _ ⇒ None ? ].
295
296definition ev_xor ≝ λv1, v2: val.
297  match v1 with
298  [ Vint sz1 n1 ⇒ match v2 with
299    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
300                    (λn1. Some ? (Vint ? (exclusive_disjunction_bv ? n1 n2)))
301                    (None ?)
302    | _ ⇒ None ? ]
303  | _ ⇒ None ? ].
304
305definition ev_shl ≝ λv1, v2: val.
306  match v1 with
307  [ Vint sz1 n1 ⇒ match v2 with
308    [ Vint sz2 n2 ⇒
309       if lt_u ? n2 (bitvector_of_nat … (bitsize_of_intsize sz1))
310       then Some ? (Vint sz1 (shift_left ?? (nat_of_bitvector … n2) n1 false))
311       else None ?
312    | _ ⇒ None ? ]
313  | _ ⇒ None ? ].
314
315definition ev_shr ≝ λv1, v2: val.
316  match v1 with
317  [ Vint sz1 n1 ⇒ match v2 with
318    [ Vint sz2 n2 ⇒
319       if lt_u ? n2 (bitvector_of_nat … (bitsize_of_intsize sz1))
320       then Some ? (Vint sz1 (shift_right ?? (nat_of_bitvector … n2) n1 (head' … n1)))
321       else None ?
322    | _ ⇒ None ? ]
323  | _ ⇒ None ? ].
324
325definition ev_shru ≝ λv1, v2: val.
326  match v1 with
327  [ Vint sz1 n1 ⇒ match v2 with
328    [ Vint sz2 n2 ⇒
329       if lt_u ? n2 (bitvector_of_nat … (bitsize_of_intsize sz1))
330       then Some ? (Vint sz1 (shift_right ?? (nat_of_bitvector … n2) n1 false))
331       else None ?
332    | _ ⇒ None ? ]
333  | _ ⇒ None ? ].
334
335definition ev_addf ≝ λv1,v2: val.
336  match v1 with
337  [ Vfloat f1 ⇒ match v2 with
338    [ Vfloat f2 ⇒ Some ? (Vfloat (Fadd f1 f2))
339    | _ ⇒ None ? ]
340  | _ ⇒ None ? ].
341
342definition ev_subf ≝ λv1,v2: val.
343  match v1 with
344  [ Vfloat f1 ⇒ match v2 with
345    [ Vfloat f2 ⇒ Some ? (Vfloat (Fsub f1 f2))
346    | _ ⇒ None ? ]
347  | _ ⇒ None ? ].
348
349definition ev_mulf ≝ λv1,v2: val.
350  match v1 with
351  [ Vfloat f1 ⇒ match v2 with
352    [ Vfloat f2 ⇒ Some ? (Vfloat (Fmul f1 f2))
353    | _ ⇒ None ? ]
354  | _ ⇒ None ? ].
355
356definition ev_divf ≝ λv1,v2: val.
357  match v1 with
358  [ Vfloat f1 ⇒ match v2 with
359    [ Vfloat f2 ⇒ Some ? (Vfloat (Fdiv f1 f2))
360    | _ ⇒ None ? ]
361  | _ ⇒ None ? ].
362
363definition ev_cmp_match : comparison → option val ≝ λc.
364  match c with
365  [ Ceq ⇒ Some ? Vtrue
366  | Cne ⇒ Some ? Vfalse
367  | _   ⇒ None ?
368  ].
369
370definition ev_cmp_mismatch : comparison → option val ≝ λc.
371  match c with
372  [ Ceq ⇒ Some ? Vfalse
373  | Cne ⇒ Some ? Vtrue
374  | _   ⇒ None ?
375  ].
376
377definition ev_cmp ≝ λc: comparison. λv1,v2: val.
378  match v1 with
379  [ Vint sz1 n1 ⇒ match v2 with
380    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
381                    (λn1. Some ? (of_bool (cmp_int ? c n1 n2)))
382                    (None ?)
383    | _ ⇒ None ? ]
384  | _ ⇒ None ? ].
385
386definition ev_cmpp ≝ λc: comparison. λv1,v2: val.
387  match v1 with
388  [ Vptr ptr1 ⇒ match v2 with
389    [ Vptr ptr2 ⇒
390        if eq_block (pblock ptr1) (pblock ptr2)
391        then Some ? (of_bool (cmp_offset c (poff ptr1) (poff ptr2)))
392        else ev_cmp_mismatch c
393    | Vnull r2 ⇒ ev_cmp_mismatch c
394    | _ ⇒ None ? ]
395  | Vnull r1 ⇒ match v2 with
396    [ Vptr _ ⇒ ev_cmp_mismatch c
397    | Vnull r2 ⇒ ev_cmp_match c
398    | _ ⇒ None ?
399    ]
400  | _ ⇒ None ? ].
401
402(* TODO: check this, it isn't the cmpu used elsewhere *)
403definition ev_cmpu ≝ λc: comparison. λv1,v2: val.
404  match v1 with
405  [ Vint sz1 n1 ⇒ match v2 with
406    [ Vint sz2 n2 ⇒ intsize_eq_elim ? sz1 sz2 ? n1
407                    (λn1. Some ? (of_bool (cmpu_int ? c n1 n2)))
408                    (None ?)
409    | _ ⇒ None ? ]
410  | _ ⇒ None ? ].
411
412definition ev_cmpf ≝ λc: comparison. λv1,v2: val.
413  match v1 with
414  [ Vfloat f1 ⇒ match v2 with
415    [ Vfloat f2 ⇒ Some ? (of_bool (Fcmp c f1 f2))
416    | _ ⇒ None ? ]
417  | _ ⇒ None ? ].
418
419definition eval_binop : binary_operation → val → val → option val ≝
420λop.
421  match op with
422  [ Oadd ⇒ ev_add
423  | Osub ⇒ ev_sub
424  | Omul ⇒ ev_mul
425  | Odiv ⇒ ev_divs
426  | Odivu ⇒ ev_divu
427  | Omod ⇒ ev_mods
428  | Omodu ⇒ ev_modu
429  | Oand ⇒ ev_and
430  | Oor ⇒ ev_or
431  | Oxor ⇒ ev_xor
432  | Oshl ⇒ ev_shl
433  | Oshr ⇒ ev_shr
434  | Oshru ⇒ ev_shru
435  | Oaddf ⇒ ev_addf
436  | Osubf ⇒ ev_subf
437  | Omulf ⇒ ev_mulf
438  | Odivf ⇒ ev_divf
439  | Ocmp c ⇒ ev_cmp c
440  | Ocmpu c ⇒ ev_cmpu c
441  | Ocmpf c ⇒ ev_cmpf c
442  | Oaddp ⇒ ev_addp
443  | Osubpi ⇒ ev_subpi
444  | Osubpp sz ⇒ ev_subpp sz
445  | Ocmpp c ⇒ ev_cmpp c
446  ].
447
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