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go
golang
Commits
d169dcee
Commit
d169dcee
authored
Aug 05, 2009
by
Russ Cox
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fix division bug
R=ken OCL=32760 CL=32760
parent
abaf6046
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27 additions
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2 deletions
+27
-2
ggen.c
src/cmd/6g/ggen.c
+27
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src/cmd/6g/ggen.c
View file @
d169dcee
...
...
@@ -534,21 +534,46 @@ dodiv(int op, Node *nl, Node *nr, Node *res, Node *ax, Node *dx)
void
cgen_div
(
int
op
,
Node
*
nl
,
Node
*
nr
,
Node
*
res
)
{
Node
ax
,
dx
;
Node
ax
,
dx
,
oldax
,
olddx
;
int
rax
,
rdx
;
if
(
nl
->
ullman
>=
UINF
||
nr
->
ullman
>=
UINF
)
fatal
(
"cgen_div UINF"
);
rax
=
reg
[
D_AX
];
rdx
=
reg
[
D_DX
];
nodreg
(
&
ax
,
types
[
TINT64
],
D_AX
);
nodreg
(
&
dx
,
types
[
TINT64
],
D_DX
);
regalloc
(
&
ax
,
nl
->
type
,
&
ax
);
regalloc
(
&
dx
,
nl
->
type
,
&
dx
);
// save current ax and dx if they are live
memset
(
&
oldax
,
0
,
sizeof
oldax
);
memset
(
&
olddx
,
0
,
sizeof
olddx
);
if
(
rax
>
0
)
{
regalloc
(
&
oldax
,
nl
->
type
,
N
);
gmove
(
&
ax
,
&
oldax
);
}
if
(
rdx
>
0
)
{
regalloc
(
&
olddx
,
nl
->
type
,
N
);
gmove
(
&
dx
,
&
olddx
);
}
dodiv
(
op
,
nl
,
nr
,
res
,
&
ax
,
&
dx
);
regfree
(
&
ax
);
regfree
(
&
dx
);
if
(
rax
>
0
)
{
gmove
(
&
oldax
,
&
ax
);
regfree
(
&
oldax
);
}
if
(
rdx
>
0
)
{
gmove
(
&
olddx
,
&
dx
);
regfree
(
&
olddx
);
}
}
/*
...
...
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