142 lines
6.8 KiB
HTML
142 lines
6.8 KiB
HTML
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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) 1991-2016 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 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using as: TILE-Gx Syntax</title>
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<meta name="description" content="Using as: TILE-Gx Syntax">
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<meta name="keywords" content="Using as: TILE-Gx Syntax">
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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="TILE_002dGx_002dDependent.html#TILE_002dGx_002dDependent" rel="up" title="TILE-Gx-Dependent">
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<link href="TILE_002dGx-Opcodes.html#TILE_002dGx-Opcodes" rel="next" title="TILE-Gx Opcodes">
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<link href="TILE_002dGx-Options.html#TILE_002dGx-Options" rel="prev" title="TILE-Gx Options">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="TILE_002dGx-Syntax"></a>
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<div class="header">
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<p>
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Next: <a href="TILE_002dGx-Directives.html#TILE_002dGx-Directives" accesskey="n" rel="next">TILE-Gx Directives</a>, Previous: <a href="TILE_002dGx-Options.html#TILE_002dGx-Options" accesskey="p" rel="prev">TILE-Gx Options</a>, Up: <a href="TILE_002dGx_002dDependent.html#TILE_002dGx_002dDependent" accesskey="u" rel="up">TILE-Gx-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-26"></a>
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<h4 class="subsection">9.45.2 Syntax</h4>
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<a name="index-TILE_002dGx-syntax"></a>
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<a name="index-syntax_002c-TILE_002dGx"></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="TILE_002dGx-Opcodes.html#TILE_002dGx-Opcodes" accesskey="1">TILE-Gx 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="TILE_002dGx-Registers.html#TILE_002dGx-Registers" accesskey="2">TILE-Gx 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="TILE_002dGx-Modifiers.html#TILE_002dGx-Modifiers" accesskey="3">TILE-Gx 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="TILE_002dGx-Directives.html#TILE_002dGx-Directives" accesskey="n" rel="next">TILE-Gx Directives</a>, Previous: <a href="TILE_002dGx-Options.html#TILE_002dGx-Options" accesskey="p" rel="prev">TILE-Gx Options</a>, Up: <a href="TILE_002dGx_002dDependent.html#TILE_002dGx_002dDependent" accesskey="u" rel="up">TILE-Gx-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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