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go
golang
Commits
41861ca7
Commit
41861ca7
authored
Jul 17, 2008
by
Ken Thompson
Browse files
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Plain Diff
one more time for divide
SVN=127911
parent
85303f27
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Showing
1 changed file
with
42 additions
and
44 deletions
+42
-44
gen.c
src/cmd/6g/gen.c
+42
-44
No files found.
src/cmd/6g/gen.c
View file @
41861ca7
...
...
@@ -945,33 +945,28 @@ samereg(Node *a, Node *b)
}
void
dodiv
(
int
op
,
Node
*
nl
,
Node
*
nr
,
Node
*
res
)
dodiv
(
int
op
,
Node
*
nl
,
Node
*
nr
,
Node
*
res
,
Node
*
ax
,
Node
*
dx
)
{
int
a
;
Node
n1
,
n2
,
n3
;
nodreg
(
&
n1
,
types
[
TINT64
],
D_AX
);
nodreg
(
&
n2
,
types
[
TINT64
],
D_DX
);
regalloc
(
&
n1
,
nl
->
type
,
&
n1
);
regalloc
(
&
n2
,
nl
->
type
,
&
n2
);
Node
n3
;
a
=
optoas
(
op
,
nl
->
type
);
if
(
!
issigned
[
nl
->
type
->
etype
])
{
nodconst
(
&
n3
,
nl
->
type
,
0
);
gmove
(
&
n3
,
&
n2
);
gmove
(
&
n3
,
dx
);
}
regalloc
(
&
n3
,
nr
->
type
,
N
);
if
(
nl
->
ullman
>=
nr
->
ullman
)
{
cgen
(
nl
,
&
n1
);
cgen
(
nl
,
ax
);
if
(
issigned
[
nl
->
type
->
etype
])
gins
(
optoas
(
OFOR
,
nl
->
type
),
N
,
N
);
cgen
(
nr
,
&
n3
);
gins
(
a
,
&
n3
,
N
);
}
else
{
cgen
(
nr
,
&
n3
);
cgen
(
nl
,
&
n1
);
cgen
(
nl
,
ax
);
if
(
issigned
[
nl
->
type
->
etype
])
gins
(
optoas
(
OFOR
,
nl
->
type
),
N
,
N
);
gins
(
a
,
&
n3
,
N
);
...
...
@@ -979,12 +974,9 @@ dodiv(int op, Node *nl, Node *nr, Node *res)
regfree
(
&
n3
);
if
(
op
==
ODIV
)
gmove
(
&
n1
,
res
);
gmove
(
ax
,
res
);
else
gmove
(
&
n2
,
res
);
regfree
(
&
n1
);
regfree
(
&
n2
);
gmove
(
dx
,
res
);
}
/*
...
...
@@ -995,62 +987,68 @@ dodiv(int op, Node *nl, Node *nr, Node *res)
void
cgen_div
(
int
op
,
Node
*
nl
,
Node
*
nr
,
Node
*
res
)
{
Node
n1
,
n2
,
n3
,
n4
,
n5
;
Node
ax
,
dx
,
n3
,
tmpax
,
tmpdx
;
int
a
,
rax
,
rdx
;
rax
=
reg
[
D_AX
];
rdx
=
reg
[
D_DX
];
nodreg
(
&
n1
,
types
[
TINT64
],
D_AX
);
nodreg
(
&
n2
,
types
[
TINT64
],
D_DX
);
nodreg
(
&
ax
,
types
[
TINT64
],
D_AX
);
nodreg
(
&
dx
,
types
[
TINT64
],
D_DX
);
regalloc
(
&
ax
,
nl
->
type
,
&
ax
);
regalloc
(
&
dx
,
nl
->
type
,
&
dx
);
// clean out the AX register
if
(
rax
&&
!
samereg
(
res
,
&
n1
))
{
if
(
rdx
&&
!
samereg
(
res
,
&
n2
))
{
regalloc
(
&
n5
,
types
[
TINT64
],
N
);
// DX holder
regalloc
(
&
n4
,
types
[
TINT64
],
N
);
// AX holder
if
(
rax
&&
!
samereg
(
res
,
&
ax
))
{
if
(
rdx
&&
!
samereg
(
res
,
&
dx
))
{
regalloc
(
&
tmpdx
,
types
[
TINT64
],
N
);
regalloc
(
&
tmpax
,
types
[
TINT64
],
N
);
regalloc
(
&
n3
,
nl
->
type
,
N
);
// dest for div
gins
(
AMOVQ
,
&
n2
,
&
n5
);
gins
(
AMOVQ
,
&
n1
,
&
n4
);
dodiv
(
op
,
nl
,
nr
,
&
n3
);
gins
(
AMOVQ
,
&
n4
,
&
n1
);
gins
(
AMOVQ
,
&
n5
,
&
n2
);
gins
(
AMOVQ
,
&
dx
,
&
tmpdx
);
gins
(
AMOVQ
,
&
ax
,
&
tmpax
);
dodiv
(
op
,
nl
,
nr
,
&
n3
,
&
ax
,
&
dx
);
gins
(
AMOVQ
,
&
tmpax
,
&
ax
);
gins
(
AMOVQ
,
&
tmpdx
,
&
dx
);
gmove
(
&
n3
,
res
);
regfree
(
&
n5
);
regfree
(
&
n4
);
regfree
(
&
tmpdx
);
regfree
(
&
tmpax
);
regfree
(
&
n3
);
return
;
goto
ret
;
}
regalloc
(
&
n4
,
types
[
TINT64
],
N
);
// AX holder
regalloc
(
&
tmpax
,
types
[
TINT64
],
N
);
regalloc
(
&
n3
,
nl
->
type
,
N
);
// dest for div
gins
(
AMOVQ
,
&
n1
,
&
n4
);
dodiv
(
op
,
nl
,
nr
,
&
n3
);
gins
(
AMOVQ
,
&
n4
,
&
n1
);
gins
(
AMOVQ
,
&
ax
,
&
tmpax
);
dodiv
(
op
,
nl
,
nr
,
&
n3
,
&
ax
,
&
dx
);
gins
(
AMOVQ
,
&
tmpax
,
&
ax
);
gmove
(
&
n3
,
res
);
regfree
(
&
n4
);
regfree
(
&
tmpax
);
regfree
(
&
n3
);
return
;
goto
ret
;
}
// clean out the DX register
if
(
rdx
&&
!
samereg
(
res
,
&
n2
))
{
regalloc
(
&
n4
,
types
[
TINT64
],
N
);
// DX holder
if
(
rdx
&&
!
samereg
(
res
,
&
dx
))
{
regalloc
(
&
tmpdx
,
types
[
TINT64
],
N
);
regalloc
(
&
n3
,
nl
->
type
,
N
);
// dest for div
gins
(
AMOVQ
,
&
n2
,
&
n4
);
dodiv
(
op
,
nl
,
nr
,
&
n3
);
gins
(
AMOVQ
,
&
n4
,
&
n2
);
gins
(
AMOVQ
,
&
dx
,
&
tmpdx
);
dodiv
(
op
,
nl
,
nr
,
&
n3
,
&
ax
,
&
dx
);
gins
(
AMOVQ
,
&
tmpdx
,
&
dx
);
gmove
(
&
n3
,
res
);
regfree
(
&
n4
);
regfree
(
&
tmpdx
);
regfree
(
&
n3
);
return
;
goto
ret
;
}
dodiv
(
op
,
nl
,
nr
,
res
);
dodiv
(
op
,
nl
,
nr
,
res
,
&
ax
,
&
dx
);
ret:
regfree
(
&
ax
);
regfree
(
&
dx
);
}
/*
...
...
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