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lvzhengyang
riscv-gcc-1
Commits
3cf965b7
Commit
3cf965b7
authored
Oct 01, 1999
by
Bernd Schmidt
Committed by
Bernd Schmidt
Oct 01, 1999
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Delete !REGISTER_CONSTRAINTS code
From-SVN: r29754
parent
19af6455
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27 deletions
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gcc/ChangeLog
+1
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gcc/md.texi
+0
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gcc/ChangeLog
View file @
3cf965b7
Fri
Oct
1
10
:
56
:
06
1999
Bernd
Schmidt
<
bernds
@cygnus
.
co
.
uk
>
Fri
Oct
1
10
:
56
:
06
1999
Bernd
Schmidt
<
bernds
@cygnus
.
co
.
uk
>
*
md
.
texi
(
No
Constraints
)
:
Delete
section
.
*
Makefile
.
in
(
genattrtab
.
o
)
:
Don
'
t
depend
on
"insn-config.h"
.
*
Makefile
.
in
(
genattrtab
.
o
)
:
Don
'
t
depend
on
"insn-config.h"
.
*
final
.
c
(
final_scan_insn
)
:
We
always
have
register
constraints
.
*
final
.
c
(
final_scan_insn
)
:
We
always
have
register
constraints
.
*
genattrtab
.
c
:
Don
'
t
include
"insn-config.h"
.
*
genattrtab
.
c
:
Don
'
t
include
"insn-config.h"
.
...
...
gcc/md.texi
View file @
3cf965b7
...
@@ -667,7 +667,6 @@ have. Constraints can also require two operands to match.
...
@@ -667,7 +667,6 @@ have. Constraints can also require two operands to match.
*
Class
Preferences
::
Constraints
guide
which
hard
register
to
put
things
in
.
*
Class
Preferences
::
Constraints
guide
which
hard
register
to
put
things
in
.
*
Modifiers
::
More
precise
control
over
effects
of
constraints
.
*
Modifiers
::
More
precise
control
over
effects
of
constraints
.
*
Machine
Constraints
::
Existing
constraints
for
some
particular
machines
.
*
Machine
Constraints
::
Existing
constraints
for
some
particular
machines
.
*
No
Constraints
::
Describing
a
clean
machine
without
constraints
.
@end
menu
@end
menu
@end
ifset
@end
ifset
...
@@ -1660,32 +1659,6 @@ Even register
...
@@ -1660,32 +1659,6 @@ Even register
@end
table
@end
table
@ifset
INTERNALS
@ifset
INTERNALS
@node
No
Constraints
@subsection
Not
Using
Constraints
@cindex
no
constraints
@cindex
not
using
constraints
Some
machines
are
so
clean
that
operand
constraints
are
not
required
.
For
example
,
on
the
Vax
,
an
operand
valid
in
one
context
is
valid
in
any
other
context
.
On
such
a
machine
,
every
operand
constraint
would
be
@samp{
g
}
,
excepting
only
operands
of
``
load
address
''
instructions
which
are
written
as
if
they
referred
to
a
memory
location
'
s
contents
but
actual
refer
to
its
address
.
They
would
have
constraint
@samp{
p
}
.
@cindex
empty
constraints
For
such
machines
,
instead
of
writing
@samp{
g
}
and
@samp{
p
}
for
all
the
constraints
,
you
can
choose
to
write
a
description
with
empty
constraints
.
Then
you
write
@samp{
""
}
for
the
constraint
in
every
@code{
match_operand
}
.
Address
operands
are
identified
by
writing
an
@code{
address
}
expression
around
the
@code{
match_operand
}
,
not
by
their
constraints
.
When
the
machine
description
has
just
empty
constraints
,
certain
parts
of
compilation
are
skipped
,
making
the
compiler
faster
.
However
,
few
machines
actually
do
not
need
constraints
;
all
machine
descriptions
now
in
existence
use
constraints
.
@end
ifset
@ifset
INTERNALS
@node
Standard
Names
@node
Standard
Names
@section
Standard
Pattern
Names
For
Generation
@section
Standard
Pattern
Names
For
Generation
@cindex
standard
pattern
names
@cindex
standard
pattern
names
...
...
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