@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 2002
|
@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 2002
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@c Free Software Foundation, Inc.
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@c Free Software Foundation, Inc.
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@c This is part of the GAS manual.
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@c This is part of the GAS manual.
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@c For copying conditions, see the file as.texinfo.
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@c For copying conditions, see the file as.texinfo.
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@ifset GENERIC
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@ifset GENERIC
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@page
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@page
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@node i960-Dependent
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@node i960-Dependent
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@chapter Intel 80960 Dependent Features
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@chapter Intel 80960 Dependent Features
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@end ifset
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@end ifset
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@ifclear GENERIC
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@ifclear GENERIC
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@node Machine Dependencies
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@node Machine Dependencies
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@chapter Intel 80960 Dependent Features
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@chapter Intel 80960 Dependent Features
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@end ifclear
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@end ifclear
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|
|
@cindex i960 support
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@cindex i960 support
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@menu
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@menu
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* Options-i960:: i960 Command-line Options
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* Options-i960:: i960 Command-line Options
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* Floating Point-i960:: Floating Point
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* Floating Point-i960:: Floating Point
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* Directives-i960:: i960 Machine Directives
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* Directives-i960:: i960 Machine Directives
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* Opcodes for i960:: i960 Opcodes
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* Opcodes for i960:: i960 Opcodes
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@end menu
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@end menu
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|
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@c FIXME! Add Syntax sec with discussion of bitfields here, at least so
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@c FIXME! Add Syntax sec with discussion of bitfields here, at least so
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@c long as they're not turned on for other machines than 960.
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@c long as they're not turned on for other machines than 960.
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|
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@node Options-i960
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@node Options-i960
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|
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@section i960 Command-line Options
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@section i960 Command-line Options
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|
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@cindex i960 options
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@cindex i960 options
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@cindex options, i960
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@cindex options, i960
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@table @code
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@table @code
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|
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@cindex i960 architecture options
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@cindex i960 architecture options
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@cindex architecture options, i960
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@cindex architecture options, i960
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@cindex @code{-A} options, i960
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@cindex @code{-A} options, i960
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@item -ACA | -ACA_A | -ACB | -ACC | -AKA | -AKB | -AKC | -AMC
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@item -ACA | -ACA_A | -ACB | -ACC | -AKA | -AKB | -AKC | -AMC
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Select the 80960 architecture. Instructions or features not supported
|
Select the 80960 architecture. Instructions or features not supported
|
by the selected architecture cause fatal errors.
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by the selected architecture cause fatal errors.
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|
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@samp{-ACA} is equivalent to @samp{-ACA_A}; @samp{-AKC} is equivalent to
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@samp{-ACA} is equivalent to @samp{-ACA_A}; @samp{-AKC} is equivalent to
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@samp{-AMC}. Synonyms are provided for compatibility with other tools.
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@samp{-AMC}. Synonyms are provided for compatibility with other tools.
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|
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If you do not specify any of these options, @code{@value{AS}} generates code
|
If you do not specify any of these options, @code{@value{AS}} generates code
|
for any instruction or feature that is supported by @emph{some} version of the
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for any instruction or feature that is supported by @emph{some} version of the
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960 (even if this means mixing architectures!). In principle,
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960 (even if this means mixing architectures!). In principle,
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@code{@value{AS}} attempts to deduce the minimal sufficient processor type if
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@code{@value{AS}} attempts to deduce the minimal sufficient processor type if
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none is specified; depending on the object code format, the processor type may
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none is specified; depending on the object code format, the processor type may
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be recorded in the object file. If it is critical that the @code{@value{AS}}
|
be recorded in the object file. If it is critical that the @code{@value{AS}}
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output match a specific architecture, specify that architecture explicitly.
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output match a specific architecture, specify that architecture explicitly.
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|
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@cindex @code{-b} option, i960
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@cindex @code{-b} option, i960
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@cindex branch recording, i960
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@cindex branch recording, i960
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@cindex i960 branch recording
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@cindex i960 branch recording
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@item -b
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@item -b
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Add code to collect information about conditional branches taken, for
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Add code to collect information about conditional branches taken, for
|
later optimization using branch prediction bits. (The conditional branch
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later optimization using branch prediction bits. (The conditional branch
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instructions have branch prediction bits in the CA, CB, and CC
|
instructions have branch prediction bits in the CA, CB, and CC
|
architectures.) If @var{BR} represents a conditional branch instruction,
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architectures.) If @var{BR} represents a conditional branch instruction,
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the following represents the code generated by the assembler when
|
the following represents the code generated by the assembler when
|
@samp{-b} is specified:
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@samp{-b} is specified:
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|
|
@smallexample
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@smallexample
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call @var{increment routine}
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call @var{increment routine}
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.word 0 # pre-counter
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.word 0 # pre-counter
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Label: @var{BR}
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Label: @var{BR}
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call @var{increment routine}
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call @var{increment routine}
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.word 0 # post-counter
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.word 0 # post-counter
|
@end smallexample
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@end smallexample
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|
|
The counter following a branch records the number of times that branch
|
The counter following a branch records the number of times that branch
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was @emph{not} taken; the difference between the two counters is the
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was @emph{not} taken; the difference between the two counters is the
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number of times the branch @emph{was} taken.
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number of times the branch @emph{was} taken.
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|
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@cindex @code{gbr960}, i960 postprocessor
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@cindex @code{gbr960}, i960 postprocessor
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@cindex branch statistics table, i960
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@cindex branch statistics table, i960
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A table of every such @code{Label} is also generated, so that the
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A table of every such @code{Label} is also generated, so that the
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external postprocessor @code{gbr960} (supplied by Intel) can locate all
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external postprocessor @code{gbr960} (supplied by Intel) can locate all
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the counters. This table is always labeled @samp{__BRANCH_TABLE__};
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the counters. This table is always labeled @samp{__BRANCH_TABLE__};
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this is a local symbol to permit collecting statistics for many separate
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this is a local symbol to permit collecting statistics for many separate
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object files. The table is word aligned, and begins with a two-word
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object files. The table is word aligned, and begins with a two-word
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header. The first word, initialized to 0, is used in maintaining linked
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header. The first word, initialized to 0, is used in maintaining linked
|
lists of branch tables. The second word is a count of the number of
|
lists of branch tables. The second word is a count of the number of
|
entries in the table, which follow immediately: each is a word, pointing
|
entries in the table, which follow immediately: each is a word, pointing
|
to one of the labels illustrated above.
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to one of the labels illustrated above.
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|
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@c TEXI2ROFF-KILL
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@c TEXI2ROFF-KILL
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@ifinfo
|
@ifinfo
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@c END TEXI2ROFF-KILL
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@c END TEXI2ROFF-KILL
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@example
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@example
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+------------+------------+------------+ ... +------------+
|
+------------+------------+------------+ ... +------------+
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| | | | | |
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| | | | | |
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| *NEXT | COUNT: N | *BRLAB 1 | | *BRLAB N |
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| *NEXT | COUNT: N | *BRLAB 1 | | *BRLAB N |
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| | | | | |
|
| | | | | |
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+------------+------------+------------+ ... +------------+
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+------------+------------+------------+ ... +------------+
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|
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__BRANCH_TABLE__ layout
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__BRANCH_TABLE__ layout
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@end example
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@end example
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@c TEXI2ROFF-KILL
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@c TEXI2ROFF-KILL
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@end ifinfo
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@end ifinfo
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@need 2000
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@need 2000
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@tex
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@tex
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\vskip 1pc
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\vskip 1pc
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\line{\leftskip=0pt\hskip\tableindent
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\line{\leftskip=0pt\hskip\tableindent
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\boxit{2cm}{\tt *NEXT}\boxit{2cm}{\tt COUNT: \it N}\boxit{2cm}{\tt
|
\boxit{2cm}{\tt *NEXT}\boxit{2cm}{\tt COUNT: \it N}\boxit{2cm}{\tt
|
*BRLAB 1}\ibox{1cm}{\quad\dots}\boxit{2cm}{\tt *BRLAB \it N}\hfil}
|
*BRLAB 1}\ibox{1cm}{\quad\dots}\boxit{2cm}{\tt *BRLAB \it N}\hfil}
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\centerline{\it {\tt \_\_BRANCH\_TABLE\_\_} layout}
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\centerline{\it {\tt \_\_BRANCH\_TABLE\_\_} layout}
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@end tex
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@end tex
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@c END TEXI2ROFF-KILL
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@c END TEXI2ROFF-KILL
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|
|
The first word of the header is used to locate multiple branch tables,
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The first word of the header is used to locate multiple branch tables,
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since each object file may contain one. Normally the links are
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since each object file may contain one. Normally the links are
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maintained with a call to an initialization routine, placed at the
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maintained with a call to an initialization routine, placed at the
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beginning of each function in the file. The @sc{gnu} C compiler
|
beginning of each function in the file. The @sc{gnu} C compiler
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generates these calls automatically when you give it a @samp{-b} option.
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generates these calls automatically when you give it a @samp{-b} option.
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For further details, see the documentation of @samp{gbr960}.
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For further details, see the documentation of @samp{gbr960}.
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|
|
@cindex @code{-no-relax} option, i960
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@cindex @code{-no-relax} option, i960
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@item -no-relax
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@item -no-relax
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Normally, Compare-and-Branch instructions with targets that require
|
Normally, Compare-and-Branch instructions with targets that require
|
displacements greater than 13 bits (or that have external targets) are
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displacements greater than 13 bits (or that have external targets) are
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replaced with the corresponding compare (or @samp{chkbit}) and branch
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replaced with the corresponding compare (or @samp{chkbit}) and branch
|
instructions. You can use the @samp{-no-relax} option to specify that
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instructions. You can use the @samp{-no-relax} option to specify that
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@code{@value{AS}} should generate errors instead, if the target displacement
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@code{@value{AS}} should generate errors instead, if the target displacement
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is larger than 13 bits.
|
is larger than 13 bits.
|
|
|
This option does not affect the Compare-and-Jump instructions; the code
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This option does not affect the Compare-and-Jump instructions; the code
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emitted for them is @emph{always} adjusted when necessary (depending on
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emitted for them is @emph{always} adjusted when necessary (depending on
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displacement size), regardless of whether you use @samp{-no-relax}.
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displacement size), regardless of whether you use @samp{-no-relax}.
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@end table
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@end table
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|
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@node Floating Point-i960
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@node Floating Point-i960
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@section Floating Point
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@section Floating Point
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|
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@cindex floating point, i960 (@sc{ieee})
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@cindex floating point, i960 (@sc{ieee})
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@cindex i960 floating point (@sc{ieee})
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@cindex i960 floating point (@sc{ieee})
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@code{@value{AS}} generates @sc{ieee} floating-point numbers for the directives
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@code{@value{AS}} generates @sc{ieee} floating-point numbers for the directives
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@samp{.float}, @samp{.double}, @samp{.extended}, and @samp{.single}.
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@samp{.float}, @samp{.double}, @samp{.extended}, and @samp{.single}.
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|
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@node Directives-i960
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@node Directives-i960
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@section i960 Machine Directives
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@section i960 Machine Directives
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|
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@cindex machine directives, i960
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@cindex machine directives, i960
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@cindex i960 machine directives
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@cindex i960 machine directives
|
|
|
@table @code
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@table @code
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@cindex @code{bss} directive, i960
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@cindex @code{bss} directive, i960
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@item .bss @var{symbol}, @var{length}, @var{align}
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@item .bss @var{symbol}, @var{length}, @var{align}
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Reserve @var{length} bytes in the bss section for a local @var{symbol},
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Reserve @var{length} bytes in the bss section for a local @var{symbol},
|
aligned to the power of two specified by @var{align}. @var{length} and
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aligned to the power of two specified by @var{align}. @var{length} and
|
@var{align} must be positive absolute expressions. This directive
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@var{align} must be positive absolute expressions. This directive
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differs from @samp{.lcomm} only in that it permits you to specify
|
differs from @samp{.lcomm} only in that it permits you to specify
|
an alignment. @xref{Lcomm,,@code{.lcomm}}.
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an alignment. @xref{Lcomm,,@code{.lcomm}}.
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@end table
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@end table
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|
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@table @code
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@table @code
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@cindex @code{extended} directive, i960
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@cindex @code{extended} directive, i960
|
@item .extended @var{flonums}
|
@item .extended @var{flonums}
|
@code{.extended} expects zero or more flonums, separated by commas; for
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@code{.extended} expects zero or more flonums, separated by commas; for
|
each flonum, @samp{.extended} emits an @sc{ieee} extended-format (80-bit)
|
each flonum, @samp{.extended} emits an @sc{ieee} extended-format (80-bit)
|
floating-point number.
|
floating-point number.
|
|
|
@cindex @code{leafproc} directive, i960
|
@cindex @code{leafproc} directive, i960
|
@item .leafproc @var{call-lab}, @var{bal-lab}
|
@item .leafproc @var{call-lab}, @var{bal-lab}
|
You can use the @samp{.leafproc} directive in conjunction with the
|
You can use the @samp{.leafproc} directive in conjunction with the
|
optimized @code{callj} instruction to enable faster calls of leaf
|
optimized @code{callj} instruction to enable faster calls of leaf
|
procedures. If a procedure is known to call no other procedures, you
|
procedures. If a procedure is known to call no other procedures, you
|
may define an entry point that skips procedure prolog code (and that does
|
may define an entry point that skips procedure prolog code (and that does
|
not depend on system-supplied saved context), and declare it as the
|
not depend on system-supplied saved context), and declare it as the
|
@var{bal-lab} using @samp{.leafproc}. If the procedure also has an
|
@var{bal-lab} using @samp{.leafproc}. If the procedure also has an
|
entry point that goes through the normal prolog, you can specify that
|
entry point that goes through the normal prolog, you can specify that
|
entry point as @var{call-lab}.
|
entry point as @var{call-lab}.
|
|
|
A @samp{.leafproc} declaration is meant for use in conjunction with the
|
A @samp{.leafproc} declaration is meant for use in conjunction with the
|
optimized call instruction @samp{callj}; the directive records the data
|
optimized call instruction @samp{callj}; the directive records the data
|
needed later to choose between converting the @samp{callj} into a
|
needed later to choose between converting the @samp{callj} into a
|
@code{bal} or a @code{call}.
|
@code{bal} or a @code{call}.
|
|
|
@var{call-lab} is optional; if only one argument is present, or if the
|
@var{call-lab} is optional; if only one argument is present, or if the
|
two arguments are identical, the single argument is assumed to be the
|
two arguments are identical, the single argument is assumed to be the
|
@code{bal} entry point.
|
@code{bal} entry point.
|
|
|
@cindex @code{sysproc} directive, i960
|
@cindex @code{sysproc} directive, i960
|
@item .sysproc @var{name}, @var{index}
|
@item .sysproc @var{name}, @var{index}
|
The @samp{.sysproc} directive defines a name for a system procedure.
|
The @samp{.sysproc} directive defines a name for a system procedure.
|
After you define it using @samp{.sysproc}, you can use @var{name} to
|
After you define it using @samp{.sysproc}, you can use @var{name} to
|
refer to the system procedure identified by @var{index} when calling
|
refer to the system procedure identified by @var{index} when calling
|
procedures with the optimized call instruction @samp{callj}.
|
procedures with the optimized call instruction @samp{callj}.
|
|
|
Both arguments are required; @var{index} must be between 0 and 31
|
Both arguments are required; @var{index} must be between 0 and 31
|
(inclusive).
|
(inclusive).
|
@end table
|
@end table
|
|
|
@node Opcodes for i960
|
@node Opcodes for i960
|
@section i960 Opcodes
|
@section i960 Opcodes
|
|
|
@cindex opcodes, i960
|
@cindex opcodes, i960
|
@cindex i960 opcodes
|
@cindex i960 opcodes
|
All Intel 960 machine instructions are supported;
|
All Intel 960 machine instructions are supported;
|
@pxref{Options-i960,,i960 Command-line Options} for a discussion of
|
@pxref{Options-i960,,i960 Command-line Options} for a discussion of
|
selecting the instruction subset for a particular 960
|
selecting the instruction subset for a particular 960
|
architecture.@refill
|
architecture.@refill
|
|
|
Some opcodes are processed beyond simply emitting a single corresponding
|
Some opcodes are processed beyond simply emitting a single corresponding
|
instruction: @samp{callj}, and Compare-and-Branch or Compare-and-Jump
|
instruction: @samp{callj}, and Compare-and-Branch or Compare-and-Jump
|
instructions with target displacements larger than 13 bits.
|
instructions with target displacements larger than 13 bits.
|
|
|
@menu
|
@menu
|
* callj-i960:: @code{callj}
|
* callj-i960:: @code{callj}
|
* Compare-and-branch-i960:: Compare-and-Branch
|
* Compare-and-branch-i960:: Compare-and-Branch
|
@end menu
|
@end menu
|
|
|
@node callj-i960
|
@node callj-i960
|
@subsection @code{callj}
|
@subsection @code{callj}
|
|
|
@cindex @code{callj}, i960 pseudo-opcode
|
@cindex @code{callj}, i960 pseudo-opcode
|
@cindex i960 @code{callj} pseudo-opcode
|
@cindex i960 @code{callj} pseudo-opcode
|
You can write @code{callj} to have the assembler or the linker determine
|
You can write @code{callj} to have the assembler or the linker determine
|
the most appropriate form of subroutine call: @samp{call},
|
the most appropriate form of subroutine call: @samp{call},
|
@samp{bal}, or @samp{calls}. If the assembly source contains
|
@samp{bal}, or @samp{calls}. If the assembly source contains
|
enough information---a @samp{.leafproc} or @samp{.sysproc} directive
|
enough information---a @samp{.leafproc} or @samp{.sysproc} directive
|
defining the operand---then @code{@value{AS}} translates the
|
defining the operand---then @code{@value{AS}} translates the
|
@code{callj}; if not, it simply emits the @code{callj}, leaving it
|
@code{callj}; if not, it simply emits the @code{callj}, leaving it
|
for the linker to resolve.
|
for the linker to resolve.
|
|
|
@node Compare-and-branch-i960
|
@node Compare-and-branch-i960
|
@subsection Compare-and-Branch
|
@subsection Compare-and-Branch
|
|
|
@cindex i960 compare/branch instructions
|
@cindex i960 compare/branch instructions
|
@cindex compare/branch instructions, i960
|
@cindex compare/branch instructions, i960
|
The 960 architectures provide combined Compare-and-Branch instructions
|
The 960 architectures provide combined Compare-and-Branch instructions
|
that permit you to store the branch target in the lower 13 bits of the
|
that permit you to store the branch target in the lower 13 bits of the
|
instruction word itself. However, if you specify a branch target far
|
instruction word itself. However, if you specify a branch target far
|
enough away that its address won't fit in 13 bits, the assembler can
|
enough away that its address won't fit in 13 bits, the assembler can
|
either issue an error, or convert your Compare-and-Branch instruction
|
either issue an error, or convert your Compare-and-Branch instruction
|
into separate instructions to do the compare and the branch.
|
into separate instructions to do the compare and the branch.
|
|
|
@cindex compare and jump expansions, i960
|
@cindex compare and jump expansions, i960
|
@cindex i960 compare and jump expansions
|
@cindex i960 compare and jump expansions
|
Whether @code{@value{AS}} gives an error or expands the instruction depends
|
Whether @code{@value{AS}} gives an error or expands the instruction depends
|
on two choices you can make: whether you use the @samp{-no-relax} option,
|
on two choices you can make: whether you use the @samp{-no-relax} option,
|
and whether you use a ``Compare and Branch'' instruction or a ``Compare
|
and whether you use a ``Compare and Branch'' instruction or a ``Compare
|
and Jump'' instruction. The ``Jump'' instructions are @emph{always}
|
and Jump'' instruction. The ``Jump'' instructions are @emph{always}
|
expanded if necessary; the ``Branch'' instructions are expanded when
|
expanded if necessary; the ``Branch'' instructions are expanded when
|
necessary @emph{unless} you specify @code{-no-relax}---in which case
|
necessary @emph{unless} you specify @code{-no-relax}---in which case
|
@code{@value{AS}} gives an error instead.
|
@code{@value{AS}} gives an error instead.
|
|
|
These are the Compare-and-Branch instructions, their ``Jump'' variants,
|
These are the Compare-and-Branch instructions, their ``Jump'' variants,
|
and the instruction pairs they may expand into:
|
and the instruction pairs they may expand into:
|
|
|
@c TEXI2ROFF-KILL
|
@c TEXI2ROFF-KILL
|
@ifinfo
|
@ifinfo
|
@c END TEXI2ROFF-KILL
|
@c END TEXI2ROFF-KILL
|
@example
|
@example
|
Compare and
|
Compare and
|
Branch Jump Expanded to
|
Branch Jump Expanded to
|
------ ------ ------------
|
------ ------ ------------
|
bbc chkbit; bno
|
bbc chkbit; bno
|
bbs chkbit; bo
|
bbs chkbit; bo
|
cmpibe cmpije cmpi; be
|
cmpibe cmpije cmpi; be
|
cmpibg cmpijg cmpi; bg
|
cmpibg cmpijg cmpi; bg
|
cmpibge cmpijge cmpi; bge
|
cmpibge cmpijge cmpi; bge
|
cmpibl cmpijl cmpi; bl
|
cmpibl cmpijl cmpi; bl
|
cmpible cmpijle cmpi; ble
|
cmpible cmpijle cmpi; ble
|
cmpibno cmpijno cmpi; bno
|
cmpibno cmpijno cmpi; bno
|
cmpibne cmpijne cmpi; bne
|
cmpibne cmpijne cmpi; bne
|
cmpibo cmpijo cmpi; bo
|
cmpibo cmpijo cmpi; bo
|
cmpobe cmpoje cmpo; be
|
cmpobe cmpoje cmpo; be
|
cmpobg cmpojg cmpo; bg
|
cmpobg cmpojg cmpo; bg
|
cmpobge cmpojge cmpo; bge
|
cmpobge cmpojge cmpo; bge
|
cmpobl cmpojl cmpo; bl
|
cmpobl cmpojl cmpo; bl
|
cmpoble cmpojle cmpo; ble
|
cmpoble cmpojle cmpo; ble
|
cmpobne cmpojne cmpo; bne
|
cmpobne cmpojne cmpo; bne
|
@end example
|
@end example
|
@c TEXI2ROFF-KILL
|
@c TEXI2ROFF-KILL
|
@end ifinfo
|
@end ifinfo
|
@tex
|
@tex
|
\hskip\tableindent
|
\hskip\tableindent
|
\halign{\hfil {\tt #}\quad&\hfil {\tt #}\qquad&{\tt #}\hfil\cr
|
\halign{\hfil {\tt #}\quad&\hfil {\tt #}\qquad&{\tt #}\hfil\cr
|
\omit{\hfil\it Compare and\hfil}\span\omit&\cr
|
\omit{\hfil\it Compare and\hfil}\span\omit&\cr
|
{\it Branch}&{\it Jump}&{\it Expanded to}\cr
|
{\it Branch}&{\it Jump}&{\it Expanded to}\cr
|
bbc& & chkbit; bno\cr
|
bbc& & chkbit; bno\cr
|
bbs& & chkbit; bo\cr
|
bbs& & chkbit; bo\cr
|
cmpibe& cmpije& cmpi; be\cr
|
cmpibe& cmpije& cmpi; be\cr
|
cmpibg& cmpijg& cmpi; bg\cr
|
cmpibg& cmpijg& cmpi; bg\cr
|
cmpibge& cmpijge& cmpi; bge\cr
|
cmpibge& cmpijge& cmpi; bge\cr
|
cmpibl& cmpijl& cmpi; bl\cr
|
cmpibl& cmpijl& cmpi; bl\cr
|
cmpible& cmpijle& cmpi; ble\cr
|
cmpible& cmpijle& cmpi; ble\cr
|
cmpibno& cmpijno& cmpi; bno\cr
|
cmpibno& cmpijno& cmpi; bno\cr
|
cmpibne& cmpijne& cmpi; bne\cr
|
cmpibne& cmpijne& cmpi; bne\cr
|
cmpibo& cmpijo& cmpi; bo\cr
|
cmpibo& cmpijo& cmpi; bo\cr
|
cmpobe& cmpoje& cmpo; be\cr
|
cmpobe& cmpoje& cmpo; be\cr
|
cmpobg& cmpojg& cmpo; bg\cr
|
cmpobg& cmpojg& cmpo; bg\cr
|
cmpobge& cmpojge& cmpo; bge\cr
|
cmpobge& cmpojge& cmpo; bge\cr
|
cmpobl& cmpojl& cmpo; bl\cr
|
cmpobl& cmpojl& cmpo; bl\cr
|
cmpoble& cmpojle& cmpo; ble\cr
|
cmpoble& cmpojle& cmpo; ble\cr
|
cmpobne& cmpojne& cmpo; bne\cr}
|
cmpobne& cmpojne& cmpo; bne\cr}
|
@end tex
|
@end tex
|
@c END TEXI2ROFF-KILL
|
@c END TEXI2ROFF-KILL
|
|
|