142 lines
6.7 KiB
HTML
142 lines
6.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This file documents the GNU Assembler "as".
|
|
|
|
Copyright (C) 1991-2016 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3
|
|
or any later version published by the Free Software Foundation;
|
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
|
Back-Cover Texts. A copy of the license is included in the
|
|
section entitled "GNU Free Documentation License".
|
|
-->
|
|
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Using as: TILEPro Syntax</title>
|
|
|
|
<meta name="description" content="Using as: TILEPro Syntax">
|
|
<meta name="keywords" content="Using as: TILEPro Syntax">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="TILEPro_002dDependent.html#TILEPro_002dDependent" rel="up" title="TILEPro-Dependent">
|
|
<link href="TILEPro-Opcodes.html#TILEPro-Opcodes" rel="next" title="TILEPro Opcodes">
|
|
<link href="TILEPro-Options.html#TILEPro-Options" rel="prev" title="TILEPro Options">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.indentedblock {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style:oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nocodebreak {white-space:nowrap}
|
|
span.nolinebreak {white-space:nowrap}
|
|
span.roman {font-family:serif; font-weight:normal}
|
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
|
<a name="TILEPro-Syntax"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="TILEPro-Directives.html#TILEPro-Directives" accesskey="n" rel="next">TILEPro Directives</a>, Previous: <a href="TILEPro-Options.html#TILEPro-Options" accesskey="p" rel="prev">TILEPro Options</a>, Up: <a href="TILEPro_002dDependent.html#TILEPro_002dDependent" accesskey="u" rel="up">TILEPro-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<a name="Syntax-27"></a>
|
|
<h4 class="subsection">9.46.2 Syntax</h4>
|
|
<a name="index-TILEPro-syntax"></a>
|
|
<a name="index-syntax_002c-TILEPro"></a>
|
|
|
|
<p>Block comments are delimited by ‘<samp>/*</samp>’ and ‘<samp>*/</samp>’. End of line
|
|
comments may be introduced by ‘<samp>#</samp>’.
|
|
</p>
|
|
<p>Instructions consist of a leading opcode or macro name followed by
|
|
whitespace and an optional comma-separated list of operands:
|
|
</p>
|
|
<div class="smallexample">
|
|
<pre class="smallexample"><var>opcode</var> [<var>operand</var>, …]
|
|
</pre></div>
|
|
|
|
<p>Instructions must be separated by a newline or semicolon.
|
|
</p>
|
|
<p>There are two ways to write code: either write naked instructions,
|
|
which the assembler is free to combine into VLIW bundles, or specify
|
|
the VLIW bundles explicitly.
|
|
</p>
|
|
<p>Bundles are specified using curly braces:
|
|
</p>
|
|
<div class="smallexample">
|
|
<pre class="smallexample">{ <var>add</var> r3,r4,r5 ; <var>add</var> r7,r8,r9 ; <var>lw</var> r10,r11 }
|
|
</pre></div>
|
|
|
|
<p>A bundle can span multiple lines. If you want to put multiple
|
|
instructions on a line, whether in a bundle or not, you need to
|
|
separate them with semicolons as in this example.
|
|
</p>
|
|
<p>A bundle may contain one or more instructions, up to the limit
|
|
specified by the ISA (currently three). If fewer instructions are
|
|
specified than the hardware supports in a bundle, the assembler
|
|
inserts <code>fnop</code> instructions automatically.
|
|
</p>
|
|
<p>The assembler will prefer to preserve the ordering of instructions
|
|
within the bundle, putting the first instruction in a lower-numbered
|
|
pipeline than the next one, etc. This fact, combined with the
|
|
optional use of explicit <code>fnop</code> or <code>nop</code> instructions,
|
|
allows precise control over which pipeline executes each instruction.
|
|
</p>
|
|
<p>If the instructions cannot be bundled in the listed order, the
|
|
assembler will automatically try to find a valid pipeline
|
|
assignment. If there is no way to bundle the instructions together,
|
|
the assembler reports an error.
|
|
</p>
|
|
<p>The assembler does not yet auto-bundle (automatically combine multiple
|
|
instructions into one bundle), but it reserves the right to do so in
|
|
the future. If you want to force an instruction to run by itself, put
|
|
it in a bundle explicitly with curly braces and use <code>nop</code>
|
|
instructions (not <code>fnop</code>) to fill the remaining pipeline slots in
|
|
that bundle.
|
|
</p>
|
|
<table class="menu" border="0" cellspacing="0">
|
|
<tr><td align="left" valign="top">• <a href="TILEPro-Opcodes.html#TILEPro-Opcodes" accesskey="1">TILEPro Opcodes</a>:</td><td> </td><td align="left" valign="top">Opcode Naming Conventions.
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="TILEPro-Registers.html#TILEPro-Registers" accesskey="2">TILEPro Registers</a>:</td><td> </td><td align="left" valign="top">Register Naming.
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="TILEPro-Modifiers.html#TILEPro-Modifiers" accesskey="3">TILEPro Modifiers</a>:</td><td> </td><td align="left" valign="top">Symbolic Operand Modifiers.
|
|
</td></tr>
|
|
</table>
|
|
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="TILEPro-Directives.html#TILEPro-Directives" accesskey="n" rel="next">TILEPro Directives</a>, Previous: <a href="TILEPro-Options.html#TILEPro-Options" accesskey="p" rel="prev">TILEPro Options</a>, Up: <a href="TILEPro_002dDependent.html#TILEPro_002dDependent" accesskey="u" rel="up">TILEPro-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|