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Jonas Plewinski
pystencils
Commits
e4084e94
Commit
e4084e94
authored
Apr 29, 2019
by
Martin Bauer
Browse files
Moved liveness opts to separate branch until integration is finished
parent
0cba271c
Changes
1
Hide whitespace changes
Inline
Side-by-side
pystencils/simp/liveness_opts.py
deleted
100644 → 0
View file @
0cba271c
from
sympy
import
Symbol
,
Dummy
from
pystencils
import
Field
,
Assignment
import
random
import
copy
def
get_usage
(
atoms
):
reg_usage
=
{}
for
atom
in
atoms
:
reg_usage
[
atom
.
lhs
]
=
0
for
atom
in
atoms
:
for
arg
in
atom
.
rhs
.
atoms
():
if
isinstance
(
arg
,
Symbol
)
and
not
isinstance
(
arg
,
Field
.
Access
):
if
arg
in
reg_usage
:
reg_usage
[
arg
]
+=
1
else
:
print
(
str
(
arg
)
+
" is unsatisfied"
)
return
reg_usage
def
get_definitions
(
eqs
):
definitions
=
{}
for
eq
in
eqs
:
definitions
[
eq
.
lhs
]
=
eq
return
definitions
def
get_roots
(
eqs
):
roots
=
[]
for
eq
in
eqs
:
if
isinstance
(
eq
.
lhs
,
Field
.
Access
):
roots
.
append
(
eq
.
lhs
)
if
not
roots
:
roots
.
append
(
eqs
[
-
1
].
lhs
)
return
roots
def
merge_field_accesses
(
eqs
):
field_accesses
=
{}
for
eq
in
eqs
:
for
arg
in
eq
.
rhs
.
atoms
():
if
isinstance
(
arg
,
Field
.
Access
)
and
arg
not
in
field_accesses
:
field_accesses
[
arg
]
=
Dummy
()
for
i
in
range
(
0
,
len
(
eqs
)):
for
f
,
s
in
field_accesses
.
items
():
if
f
in
eqs
[
i
].
atoms
():
eqs
[
i
]
=
eqs
[
i
].
subs
(
f
,
s
)
for
f
,
s
in
field_accesses
.
items
():
eqs
.
insert
(
0
,
Assignment
(
s
,
f
))
return
eqs
def
refuse_eqs
(
input_eqs
,
max_depth
=
0
,
max_usage
=
1
):
eqs
=
copy
.
copy
(
input_eqs
)
usages
=
get_usage
(
eqs
)
definitions
=
get_definitions
(
eqs
)
def
inline_trivially_schedulable
(
sym
,
depth
):
if
sym
not
in
usages
or
usages
[
sym
]
>
max_usage
or
depth
>
max_depth
:
return
sym
rhs
=
definitions
[
sym
].
rhs
if
len
(
rhs
.
args
)
==
0
:
return
rhs
return
rhs
.
func
(
*
[
inline_trivially_schedulable
(
arg
,
depth
+
1
)
for
arg
in
rhs
.
args
])
for
idx
,
eq
in
enumerate
(
eqs
):
if
usages
[
eq
.
lhs
]
>
1
or
isinstance
(
eq
.
lhs
,
Field
.
Access
):
if
not
isinstance
(
eq
.
rhs
,
Symbol
):
eqs
[
idx
]
=
Assignment
(
eq
.
lhs
,
eq
.
rhs
.
func
(
*
[
inline_trivially_schedulable
(
arg
,
0
)
for
arg
in
eq
.
rhs
.
args
]))
count
=
0
while
(
len
(
eqs
)
!=
count
):
count
=
len
(
eqs
)
usages
=
get_usage
(
eqs
)
eqs
=
[
eq
for
eq
in
eqs
if
usages
[
eq
.
lhs
]
>
0
or
isinstance
(
eq
.
lhs
,
Field
.
Access
)]
return
eqs
def
schedule_eqs
(
eqs
,
candidate_count
=
20
):
if
candidate_count
==
0
:
return
eqs
definitions
=
get_definitions
(
eqs
)
definition_atoms
=
{}
for
sym
,
definition
in
definitions
.
items
():
definition_atoms
[
sym
]
=
list
(
definition
.
rhs
.
atoms
(
Symbol
))
roots
=
get_roots
(
eqs
)
initial_usages
=
get_usage
(
eqs
)
level
=
0
current_level_set
=
set
([
frozenset
(
roots
)])
current_usages
=
{
frozenset
(
roots
):
{
u
:
0
for
u
in
roots
}}
current_schedules
=
{
frozenset
(
roots
):
(
0
,
[])}
max_regs
=
0
while
len
(
current_level_set
)
>
0
:
new_usages
=
dict
()
new_schedules
=
dict
()
new_level_set
=
set
()
min_regs
=
min
([
len
(
current_usages
[
dec_set
])
for
dec_set
in
current_level_set
])
max_regs
=
max
(
max_regs
,
min_regs
)
candidates
=
[(
dec_set
,
len
(
current_usages
[
dec_set
]))
for
dec_set
in
current_level_set
]
random
.
shuffle
(
candidates
)
candidates
.
sort
(
key
=
lambda
d
:
d
[
1
])
for
dec_set
,
regs
in
candidates
[:
candidate_count
]:
for
dec
in
dec_set
:
new_dec_set
=
set
(
dec_set
)
new_dec_set
.
remove
(
dec
)
usage
=
dict
(
current_usages
[
dec_set
])
usage
.
pop
(
dec
)
atoms
=
definition_atoms
[
dec
]
for
arg
in
atoms
:
if
not
isinstance
(
arg
,
Field
.
Access
):
argu
=
usage
.
get
(
arg
,
initial_usages
[
arg
])
-
1
if
argu
==
0
:
new_dec_set
.
add
(
arg
)
usage
[
arg
]
=
argu
frozen_new_dec_set
=
frozenset
(
new_dec_set
)
schedule
=
current_schedules
[
dec_set
]
max_reg_count
=
max
(
len
(
usage
),
schedule
[
0
])
if
frozen_new_dec_set
not
in
new_schedules
or
max_reg_count
<
new_schedules
[
frozen_new_dec_set
][
0
]:
new_schedule
=
list
(
schedule
[
1
])
new_schedule
.
append
(
definitions
[
dec
])
new_schedules
[
frozen_new_dec_set
]
=
(
max_reg_count
,
new_schedule
)
if
len
(
frozen_new_dec_set
)
>
0
:
new_level_set
.
add
(
frozen_new_dec_set
)
new_usages
[
frozen_new_dec_set
]
=
usage
current_schedules
=
new_schedules
current_usages
=
new_usages
current_level_set
=
new_level_set
level
+=
1
schedule
=
current_schedules
[
frozenset
()]
schedule
[
1
].
reverse
()
return
(
schedule
[
1
])
def
liveness_opt_transformation
(
eqs
):
return
refuse_eqs
(
merge_field_accesses
(
schedule_eqs
(
eqs
,
3
)),
1
,
3
)
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