139 lines
11 KiB
HTML
139 lines
11 KiB
HTML
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<html>
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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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 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Memory Access Instructions (Guile Reference Manual)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Instruction-Set.html" rel="up" title="Instruction Set">
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<link href="Atomic-Memory-Access-Instructions.html" rel="next" title="Atomic Memory Access Instructions">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="Memory-Access-Instructions">
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<div class="nav-panel">
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<p>
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Next: <a href="Atomic-Memory-Access-Instructions.html" accesskey="n" rel="next">Atomic Memory Access Instructions</a>, Previous: <a href="Constant-Instructions.html" accesskey="p" rel="prev">Constant Instructions</a>, Up: <a href="Instruction-Set.html" accesskey="u" rel="up">Instruction Set</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsubsection" id="Memory-Access-Instructions-1"><span>9.3.7.9 Memory Access Instructions<a class="copiable-link" href="#Memory-Access-Instructions-1"> ¶</a></span></h4>
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<p>In these instructions, the <code class="code">/immediate</code> variants represent their
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indexes or counts as immediates; otherwise these values are unboxed u64
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locals.
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</p>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-allocate_002dwords"><span class="category-def">Instruction: </span><span><strong class="def-name">allocate-words</strong> <code class="def-code-arguments">s12:<var class="var">dst</var> s12:<var class="var">count</var></code><a class="copiable-link" href="#index-allocate_002dwords"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-allocate_002dwords_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">allocate-words/immediate</strong> <code class="def-code-arguments">s12:<var class="var">dst</var> c12:<var class="var">count</var></code><a class="copiable-link" href="#index-allocate_002dwords_002fimmediate"> ¶</a></span></dt>
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<dd><p>Allocate a fresh GC-traced object consisting of <var class="var">count</var> words and
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store it into <var class="var">dst</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">scm-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">obj</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-scm_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-scm_002dref_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">scm-ref/immediate</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">obj</var> c8:<var class="var">idx</var></code><a class="copiable-link" href="#index-scm_002dref_002fimmediate"> ¶</a></span></dt>
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<dd><p>Load the <code class="code">SCM</code> object at word offset <var class="var">idx</var> from local
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<var class="var">obj</var>, and store it to <var class="var">dst</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">scm-set!</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">idx</var> s8:<var class="var">obj</var></code><a class="copiable-link" href="#index-scm_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-scm_002dset_0021_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">scm-set!/immediate</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> c8:<var class="var">idx</var> s8:<var class="var">obj</var></code><a class="copiable-link" href="#index-scm_002dset_0021_002fimmediate"> ¶</a></span></dt>
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<dd><p>Store the <code class="code">scm</code> local <var class="var">val</var> into object <var class="var">obj</var> at word
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offset <var class="var">idx</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_002dref_002ftag"><span class="category-def">Instruction: </span><span><strong class="def-name">scm-ref/tag</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">obj</var> c8:<var class="var">tag</var></code><a class="copiable-link" href="#index-scm_002dref_002ftag"> ¶</a></span></dt>
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<dd><p>Load the first word of <var class="var">obj</var>, subtract the immediate <var class="var">tag</var>, and store the
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resulting <code class="code">SCM</code> to <var class="var">dst</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_002dset_0021_002ftag"><span class="category-def">Instruction: </span><span><strong class="def-name">scm-set!/tag</strong> <code class="def-code-arguments">s8:<var class="var">obj</var> c8:<var class="var">tag</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-scm_002dset_0021_002ftag"> ¶</a></span></dt>
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<dd><p>Set the first word of <var class="var">obj</var> to the unpacked bits of the <code class="code">scm</code>
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value <var class="var">val</var> plus the immediate value <var class="var">tag</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-word_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">word-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">obj</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-word_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-word_002dref_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">word-ref/immediate</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">obj</var> c8:<var class="var">idx</var></code><a class="copiable-link" href="#index-word_002dref_002fimmediate"> ¶</a></span></dt>
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<dd><p>Load the word at offset <var class="var">idx</var> from local <var class="var">obj</var>, and store it to
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the <code class="code">u64</code> local <var class="var">dst</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-word_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">word-set!</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">idx</var> s8:<var class="var">obj</var></code><a class="copiable-link" href="#index-word_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-word_002dset_0021_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">word-set!/immediate</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> c8:<var class="var">idx</var> s8:<var class="var">obj</var></code><a class="copiable-link" href="#index-word_002dset_0021_002fimmediate"> ¶</a></span></dt>
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<dd><p>Store the <code class="code">u64</code> local <var class="var">val</var> into object <var class="var">obj</var> at word
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offset <var class="var">idx</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-pointer_002dref_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">pointer-ref/immediate</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">obj</var> c8:<var class="var">idx</var></code><a class="copiable-link" href="#index-pointer_002dref_002fimmediate"> ¶</a></span></dt>
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<dd><p>Load the pointer at offset <var class="var">idx</var> from local <var class="var">obj</var>, and store it
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to the unboxed pointer local <var class="var">dst</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-pointer_002dset_0021_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">pointer-set!/immediate</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> c8:<var class="var">idx</var> s8:<var class="var">obj</var></code><a class="copiable-link" href="#index-pointer_002dset_0021_002fimmediate"> ¶</a></span></dt>
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<dd><p>Store the unboxed pointer local <var class="var">val</var> into object <var class="var">obj</var> at word
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offset <var class="var">idx</var>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-tail_002dpointer_002dref_002fimmediate"><span class="category-def">Instruction: </span><span><strong class="def-name">tail-pointer-ref/immediate</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">obj</var> c8:<var class="var">idx</var></code><a class="copiable-link" href="#index-tail_002dpointer_002dref_002fimmediate"> ¶</a></span></dt>
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<dd><p>Compute the address of word offset <var class="var">idx</var> from local <var class="var">obj</var>, and store it
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to <var class="var">dst</var>.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Atomic-Memory-Access-Instructions.html">Atomic Memory Access Instructions</a>, Previous: <a href="Constant-Instructions.html">Constant Instructions</a>, Up: <a href="Instruction-Set.html">Instruction Set</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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