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Kirill Smelkov
go
Commits
798b19bf
Commit
798b19bf
authored
May 23, 2009
by
Ken Thompson
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Plain Diff
improvement in registerization
R=r OCL=29317 CL=29317
parent
4238b183
Changes
1
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1 changed file
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56 additions
and
14 deletions
+56
-14
src/cmd/6g/reg.c
src/cmd/6g/reg.c
+56
-14
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src/cmd/6g/reg.c
View file @
798b19bf
...
...
@@ -748,11 +748,40 @@ doregbits(int r)
return
b
;
}
static
int
overlap
(
Var
*
v
,
int
o2
,
int
w2
)
{
int
o1
,
w1
,
t1
,
t2
,
z
;
Bits
bit
;
o1
=
v
->
offset
;
w1
=
v
->
width
;
t1
=
o1
+
w1
;
t2
=
o2
+
w2
;
if
(
!
(
t1
>
o2
&&
t2
>
o1
))
return
0
;
// set to max extent
if
(
o2
<
o1
)
v
->
offset
=
o2
;
if
(
t1
>
t2
)
v
->
width
=
t1
-
v
->
offset
;
else
v
->
width
=
t2
-
v
->
offset
;
// and dont registerize
bit
=
blsh
(
v
-
var
);
for
(
z
=
0
;
z
<
BITS
;
z
++
)
addrs
.
b
[
z
]
|=
bit
.
b
[
z
];
return
1
;
}
Bits
mkvar
(
Reg
*
r
,
Adr
*
a
)
{
Var
*
v
;
int
i
,
t
,
n
,
et
,
z
,
w
;
int
i
,
t
,
n
,
et
,
z
,
w
,
flag
;
int32
o
;
Bits
bit
;
Sym
*
s
;
...
...
@@ -793,12 +822,26 @@ mkvar(Reg *r, Adr *a)
o
=
a
->
offset
;
w
=
a
->
width
;
v
=
var
;
flag
=
0
;
for
(
i
=
0
;
i
<
nvar
;
i
++
)
{
if
(
s
==
v
->
sym
)
if
(
n
==
v
->
name
)
goto
out
;
if
(
n
==
v
->
name
)
{
// if it is the same, use it
if
(
v
->
etype
==
et
)
if
(
v
->
width
==
w
)
if
(
v
->
offset
==
o
)
goto
out
;
// if it overlaps, set max
// width and dont registerize
if
(
overlap
(
v
,
o
,
w
))
flag
=
1
;
}
v
++
;
}
if
(
flag
)
goto
none
;
switch
(
et
)
{
case
0
:
...
...
@@ -826,18 +869,9 @@ mkvar(Reg *r, Adr *a)
out:
bit
=
blsh
(
i
);
if
(
n
==
D_EXTERN
||
n
==
D_STATIC
)
for
(
z
=
0
;
z
<
BITS
;
z
++
)
externs
.
b
[
z
]
|=
bit
.
b
[
z
];
if
(
n
==
D_PARAM
)
for
(
z
=
0
;
z
<
BITS
;
z
++
)
params
.
b
[
z
]
|=
bit
.
b
[
z
];
// this has horrible consequences -
// no structure elements are registerized,
// but i dont know how to be more specific
if
(
v
->
etype
!=
et
||
v
->
width
!=
w
||
v
->
offset
!=
o
)
{
/* funny punning */
// funny punning
if
(
v
->
etype
!=
et
)
{
if
(
debug
[
'R'
])
print
(
"pun et=%d/%d w=%d/%d o=%d/%d %D
\n
"
,
v
->
etype
,
et
,
...
...
@@ -845,8 +879,16 @@ out:
v
->
offset
,
o
,
a
);
for
(
z
=
0
;
z
<
BITS
;
z
++
)
addrs
.
b
[
z
]
|=
bit
.
b
[
z
];
goto
none
;
}
if
(
n
==
D_EXTERN
||
n
==
D_STATIC
)
for
(
z
=
0
;
z
<
BITS
;
z
++
)
externs
.
b
[
z
]
|=
bit
.
b
[
z
];
if
(
n
==
D_PARAM
)
for
(
z
=
0
;
z
<
BITS
;
z
++
)
params
.
b
[
z
]
|=
bit
.
b
[
z
];
return
bit
;
none:
...
...
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