<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>msg — LLVM 8 documentation</title> <link rel="stylesheet" href="../_static/llvm-theme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/language_data.js"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="next" title="param" href="gfx8_param.html" /> <link rel="prev" title="label" href="gfx8_label.html" /> <style type="text/css"> table.right { float: right; margin-left: 20px; } table.right td { border: 1px solid #ccc; } </style> </head><body> <div class="logo"> <a href="../index.html"> <img src="../_static/logo.png" alt="LLVM Logo" width="250" height="88"/></a> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="gfx8_param.html" title="param" accesskey="N">next</a> |</li> <li class="right" > <a href="gfx8_label.html" title="label" accesskey="P">previous</a> |</li> <li><a href="http://llvm.org/">LLVM Home</a> | </li> <li><a href="../index.html">Documentation</a>»</li> <li class="nav-item nav-item-1"><a href="../AMDGPUUsage.html" >User Guide for AMDGPU Backend</a> »</li> <li class="nav-item nav-item-2"><a href="AMDGPUAsmGFX8.html" accesskey="U">Syntax of GFX8 Instructions</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="body" role="main"> <div class="section" id="msg"> <span id="amdgpu-synid8-msg"></span><h1>msg<a class="headerlink" href="#msg" title="Permalink to this headline">ΒΆ</a></h1> <p>A 16-bit message code. The bits of this operand have the following meaning:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="18%" /> <col width="82%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Bits</th> <th class="head">Description</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td>3:0</td> <td>Message <em>type</em>.</td> </tr> <tr class="row-odd"><td>6:4</td> <td>Optional <em>operation</em>.</td> </tr> <tr class="row-even"><td>9:7</td> <td>Optional <em>parameters</em>.</td> </tr> <tr class="row-odd"><td>15:10</td> <td>Unused.</td> </tr> </tbody> </table> </div></blockquote> <p>This operand may be specified as a positive 16-bit <a class="reference internal" href="../AMDGPUOperandSyntax.html#amdgpu-synid-integer-number"><span class="std std-ref">integer_number</span></a> or using the syntax described below:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="36%" /> <col width="64%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Syntax</th> <th class="head">Description</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td>sendmsg(<<em>type</em>>)</td> <td>A message identified by its <em>type</em>.</td> </tr> <tr class="row-odd"><td>sendmsg(<<em>type</em>>, <<em>op</em>>)</td> <td>A message identified by its <em>type</em> and <em>operation</em>.</td> </tr> <tr class="row-even"><td>sendmsg(<<em>type</em>>, <<em>op</em>>, <<em>stream</em>>)</td> <td>A message identified by its <em>type</em> and <em>operation</em> with a stream <em>id</em>.</td> </tr> </tbody> </table> </div></blockquote> <p><em>Type</em> may be specified using message <em>name</em> or message <em>id</em>.</p> <p><em>Op</em> may be specified using operation <em>name</em> or operation <em>id</em>.</p> <p>Stream <em>id</em> is an integer in the range 0..3.</p> <p>Message <em>id</em>, operation <em>id</em> and stream <em>id</em> must be specified as positive <a class="reference internal" href="../AMDGPUOperandSyntax.html#amdgpu-synid-integer-number"><span class="std std-ref">integer numbers</span></a>.</p> <p>Each message type supports specific operations:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="22%" /> <col width="13%" /> <col width="38%" /> <col width="15%" /> <col width="13%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Message name</th> <th class="head">Message Id</th> <th class="head">Supported Operations</th> <th class="head">Operation Id</th> <th class="head">Stream Id</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td>MSG_INTERRUPT</td> <td>1</td> <td>-</td> <td>-</td> <td>-</td> </tr> <tr class="row-odd"><td>MSG_GS</td> <td>2</td> <td>GS_OP_CUT</td> <td>1</td> <td>Optional</td> </tr> <tr class="row-even"><td></td> <td> </td> <td>GS_OP_EMIT</td> <td>2</td> <td>Optional</td> </tr> <tr class="row-odd"><td></td> <td> </td> <td>GS_OP_EMIT_CUT</td> <td>3</td> <td>Optional</td> </tr> <tr class="row-even"><td>MSG_GS_DONE</td> <td>3</td> <td>GS_OP_NOP</td> <td>0</td> <td>-</td> </tr> <tr class="row-odd"><td></td> <td> </td> <td>GS_OP_CUT</td> <td>1</td> <td>Optional</td> </tr> <tr class="row-even"><td></td> <td> </td> <td>GS_OP_EMIT</td> <td>2</td> <td>Optional</td> </tr> <tr class="row-odd"><td></td> <td> </td> <td>GS_OP_EMIT_CUT</td> <td>3</td> <td>Optional</td> </tr> <tr class="row-even"><td>MSG_SYSMSG</td> <td>15</td> <td>SYSMSG_OP_ECC_ERR_INTERRUPT</td> <td>1</td> <td>-</td> </tr> <tr class="row-odd"><td></td> <td> </td> <td>SYSMSG_OP_REG_RD</td> <td>2</td> <td>-</td> </tr> <tr class="row-even"><td></td> <td> </td> <td>SYSMSG_OP_HOST_TRAP_ACK</td> <td>3</td> <td>-</td> </tr> <tr class="row-odd"><td></td> <td> </td> <td>SYSMSG_OP_TTRACE_PC</td> <td>4</td> <td>-</td> </tr> </tbody> </table> </div></blockquote> <p>Examples:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">s_sendmsg</span> <span class="mh">0x12</span> <span class="n">s_sendmsg</span> <span class="n">sendmsg</span><span class="p">(</span><span class="n">MSG_INTERRUPT</span><span class="p">)</span> <span class="n">s_sendmsg</span> <span class="n">sendmsg</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="n">GS_OP_CUT</span><span class="p">)</span> <span class="n">s_sendmsg</span> <span class="n">sendmsg</span><span class="p">(</span><span class="n">MSG_GS</span><span class="p">,</span> <span class="n">GS_OP_EMIT</span><span class="p">)</span> <span class="n">s_sendmsg</span> <span class="n">sendmsg</span><span class="p">(</span><span class="n">MSG_GS</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span> <span class="n">s_sendmsg</span> <span class="n">sendmsg</span><span class="p">(</span><span class="n">MSG_GS_DONE</span><span class="p">,</span> <span class="n">GS_OP_EMIT_CUT</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span> <span class="n">s_sendmsg</span> <span class="n">sendmsg</span><span class="p">(</span><span class="n">MSG_SYSMSG</span><span class="p">,</span> <span class="n">SYSMSG_OP_TTRACE_PC</span><span class="p">)</span> </pre></div> </div> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="gfx8_param.html" title="param" >next</a> |</li> <li class="right" > <a href="gfx8_label.html" title="label" >previous</a> |</li> <li><a href="http://llvm.org/">LLVM Home</a> | </li> <li><a href="../index.html">Documentation</a>»</li> <li class="nav-item nav-item-1"><a href="../AMDGPUUsage.html" >User Guide for AMDGPU Backend</a> »</li> <li class="nav-item nav-item-2"><a href="AMDGPUAsmGFX8.html" >Syntax of GFX8 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