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141 lines
6.6 KiB
HTML
141 lines
6.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>TILEPro Syntax (Using as)</title>
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<meta name="description" content="TILEPro Syntax (Using as)">
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<meta name="keywords" content="TILEPro Syntax (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="TILEPro_002dDependent.html#TILEPro_002dDependent" rel="up" title="TILEPro-Dependent">
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<link href="TILEPro-Opcodes.html#TILEPro-Opcodes" rel="next" title="TILEPro Opcodes">
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<link href="TILEPro-Options.html#TILEPro-Options" rel="prev" title="TILEPro Options">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="TILEPro-Syntax"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Syntax-28"></a>
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<h4 class="subsection">9.47.2 Syntax</h4>
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<a name="index-TILEPro-syntax"></a>
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<a name="index-syntax_002c-TILEPro"></a>
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<p>Block comments are delimited by ‘<samp>/*</samp>’ and ‘<samp>*/</samp>’. End of line
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comments may be introduced by ‘<samp>#</samp>’.
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</p>
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<p>Instructions consist of a leading opcode or macro name followed by
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whitespace and an optional comma-separated list of operands:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><var>opcode</var> [<var>operand</var>, …]
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</pre></div>
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<p>Instructions must be separated by a newline or semicolon.
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</p>
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<p>There are two ways to write code: either write naked instructions,
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which the assembler is free to combine into VLIW bundles, or specify
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the VLIW bundles explicitly.
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</p>
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<p>Bundles are specified using curly braces:
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</p>
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<div class="smallexample">
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<pre class="smallexample">{ <var>add</var> r3,r4,r5 ; <var>add</var> r7,r8,r9 ; <var>lw</var> r10,r11 }
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</pre></div>
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<p>A bundle can span multiple lines. If you want to put multiple
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instructions on a line, whether in a bundle or not, you need to
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separate them with semicolons as in this example.
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</p>
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<p>A bundle may contain one or more instructions, up to the limit
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specified by the ISA (currently three). If fewer instructions are
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specified than the hardware supports in a bundle, the assembler
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inserts <code>fnop</code> instructions automatically.
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</p>
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<p>The assembler will prefer to preserve the ordering of instructions
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within the bundle, putting the first instruction in a lower-numbered
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pipeline than the next one, etc. This fact, combined with the
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optional use of explicit <code>fnop</code> or <code>nop</code> instructions,
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allows precise control over which pipeline executes each instruction.
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</p>
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<p>If the instructions cannot be bundled in the listed order, the
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assembler will automatically try to find a valid pipeline
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assignment. If there is no way to bundle the instructions together,
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the assembler reports an error.
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</p>
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<p>The assembler does not yet auto-bundle (automatically combine multiple
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instructions into one bundle), but it reserves the right to do so in
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the future. If you want to force an instruction to run by itself, put
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it in a bundle explicitly with curly braces and use <code>nop</code>
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instructions (not <code>fnop</code>) to fill the remaining pipeline slots in
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that bundle.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<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.
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</td></tr>
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<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.
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</td></tr>
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<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.
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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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>
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</div>
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</body>
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</html>
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