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frama-c
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pub
frama-c
Commits
9ff072f7
Commit
9ff072f7
authored
3 years ago
by
Patrick Baudin
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[WP] Cint.ml implements highest_bit_number in using Z.log2
parent
612bfbf5
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src/plugins/wp/Cint.ml
+5
-18
5 additions, 18 deletions
src/plugins/wp/Cint.ml
with
5 additions
and
18 deletions
src/plugins/wp/Cint.ml
+
5
−
18
View file @
9ff072f7
...
...
@@ -194,22 +194,9 @@ let match_positive_or_null e =
if
not
(
is_positive_or_null
e
)
then
raise
Not_found
;
e
let
highest_bit_number
=
let
hsb
p
=
if
p
land
2
=
0
then
0
else
1
in
let
hsb
p
=
let
n
=
p
lsr
2
in
if
n
=
0
then
hsb
p
else
2
+
hsb
n
in
let
hsb
p
=
let
n
=
p
lsr
4
in
if
n
=
0
then
hsb
p
else
4
+
hsb
n
in
let
hsb
=
Array
.
init
256
hsb
in
let
hsb
p
=
let
n
=
p
lsr
8
in
if
n
=
0
then
hsb
.
(
p
)
else
8
+
hsb
.
(
n
)
in
let
hsb
p
=
let
n
=
Integer
.
shift_right
p
Integer
.
sixteen
in
Integer
.
of_int
(
if
Integer
.
is_zero
n
then
hsb
(
Integer
.
to_int_exn
p
)
else
16
+
hsb
(
Integer
.
to_int_exn
n
))
in
let
rec
hsb_aux
p
=
let
n
=
Integer
.
shift_right
p
Integer
.
thirtytwo
in
if
Integer
.
is_zero
n
then
hsb
p
else
Integer
.
add
Integer
.
thirtytwo
(
hsb_aux
n
)
in
hsb_aux
let
match_log2
x
=
(* undefined for 0 and negative values *)
Integer
.
of_int
(
try
Z
.
log2
x
with
_
->
raise
Not_found
)
let
match_power2
,
match_power2_minus1
=
let
is_power2
k
=
(* exists n such that k == 2**n? *)
...
...
@@ -217,14 +204,14 @@ let match_power2, match_power2_minus1 =
(
Integer
.
equal
k
(
Integer
.
logand
k
(
Integer
.
neg
k
)))
in
let
rec
match_power2
e
=
match
F
.
repr
e
with
|
Logic
.
Kint
z
when
is_power2
z
->
e_zint
(
highest_bit_number
z
)
when
is_power2
z
->
e_zint
(
match_log2
z
)
|
Logic
.
Fun
(
f
,
[
n
;
k
]
)
when
Fun
.
equal
f
f_lsl
&&
is_positive_or_null
k
->
e_add
k
(
match_power2
n
)
|
_
->
raise
Not_found
in
let
match_power2_minus1
e
=
match
F
.
repr
e
with
|
Logic
.
Kint
z
when
is_power2
(
Integer
.
succ
z
)
->
e_zint
(
highest_bit_number
(
Integer
.
succ
z
))
e_zint
(
match_log2
(
Integer
.
succ
z
))
|
_
->
match_power2
(
e_add
e_one
e
)
in
match_power2
,
match_power2_minus1
...
...
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