118 lines
11 KiB
HTML
118 lines
11 KiB
HTML
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Raw Memory Access Instructions (Guile Reference Manual)</title>
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<div class="subsubsection-level-extent" id="Raw-Memory-Access-Instructions">
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<p>
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Previous: <a href="Branch-Instructions.html" accesskey="p" rel="prev">Branch 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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<h4 class="subsubsection" id="Raw-Memory-Access-Instructions-1"><span>9.3.7.16 Raw Memory Access Instructions<a class="copiable-link" href="#Raw-Memory-Access-Instructions-1"> ¶</a></span></h4>
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<p>Bytevector operations correspond closely to what the current hardware
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can do, so it makes sense to inline them to VM instructions, providing
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a clear path for eventual native compilation. Without this, Scheme
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programs would need other primitives for accessing raw bytes – but
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these primitives are as good as any.
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</p>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-u8_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">u8-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-u8_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s8_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">s8-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-s8_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-u16_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">u16-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-u16_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s16_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">s16-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-s16_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-u32_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">u32-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-u32_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s32_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">s32-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-s32_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-u64_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">u64-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-u64_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s64_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">s64-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-s64_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-f32_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">f32-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-f32_002dref"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-f64_002dref"><span class="category-def">Instruction: </span><span><strong class="def-name">f64-ref</strong> <code class="def-code-arguments">s8:<var class="var">dst</var> s8:<var class="var">ptr</var> s8:<var class="var">idx</var></code><a class="copiable-link" href="#index-f64_002dref"> ¶</a></span></dt>
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<dd>
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<p>Fetch the item at byte offset <var class="var">idx</var> from the raw pointer local
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<var class="var">ptr</var>, and store it in <var class="var">dst</var>. All accesses use native
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endianness.
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</p>
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<p>The <var class="var">idx</var> value should be an unboxed unsigned 64-bit integer.
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</p>
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<p>The results are all written to the stack as unboxed values, either as
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signed 64-bit integers, unsigned 64-bit integers, or IEEE double
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floating point numbers.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-u8_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">u8-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-u8_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s8_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">s8-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-s8_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-u16_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">u16-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-u16_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s16_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">s16-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-s16_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-u32_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">u32-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-u32_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s32_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">s32-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-s32_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-u64_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">u64-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-u64_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-s64_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">s64-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-s64_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-f32_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">f32-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-f32_002dset_0021"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-f64_002dset_0021"><span class="category-def">Instruction: </span><span><strong class="def-name">f64-set!</strong> <code class="def-code-arguments">s8:<var class="var">ptr</var> s8:<var class="var">idx</var> s8:<var class="var">val</var></code><a class="copiable-link" href="#index-f64_002dset_0021"> ¶</a></span></dt>
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<dd>
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<p>Store <var class="var">val</var> into memory pointed to by raw pointer local <var class="var">ptr</var>,
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at byte offset <var class="var">idx</var>. Multibyte values are written using native
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endianness.
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</p>
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<p>The <var class="var">idx</var> value should be an unboxed unsigned 64-bit integer.
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</p>
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<p>The <var class="var">val</var> values are all unboxed, either as signed 64-bit integers,
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unsigned 64-bit integers, or IEEE double floating point numbers.
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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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Previous: <a href="Branch-Instructions.html">Branch 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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