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130 lines
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<title>Shuffling Instructions (Guile Reference Manual)</title>
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<div class="subsubsection-level-extent" id="Shuffling-Instructions">
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Next: <a href="Trampoline-Instructions.html" accesskey="n" rel="next">Trampoline Instructions</a>, Previous: <a href="Function-Prologue-Instructions.html" accesskey="p" rel="prev">Function Prologue 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="Shuffling-Instructions-1"><span>9.3.7.3 Shuffling Instructions<a class="copiable-link" href="#Shuffling-Instructions-1"> ¶</a></span></h4>
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<p>These instructions are used to move around values on the stack.
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</p>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-mov"><span class="category-def">Instruction: </span><span><strong class="def-name">mov</strong> <code class="def-code-arguments">s12:<var class="var">dst</var> s12:<var class="var">src</var></code><a class="copiable-link" href="#index-mov"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-long_002dmov"><span class="category-def">Instruction: </span><span><strong class="def-name">long-mov</strong> <code class="def-code-arguments">s24:<var class="var">dst</var> x8:<var class="var">_</var> s24:<var class="var">src</var></code><a class="copiable-link" href="#index-long_002dmov"> ¶</a></span></dt>
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<dd><p>Copy a value from one local slot to another.
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</p>
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<p>As discussed previously, procedure arguments and local variables are
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allocated to local slots. Guile’s compiler tries to avoid shuffling
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variables around to different slots, which often makes <code class="code">mov</code>
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instructions redundant. However there are some cases in which shuffling
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is necessary, and in those cases, <code class="code">mov</code> is the thing to use.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-long_002dfmov"><span class="category-def">Instruction: </span><span><strong class="def-name">long-fmov</strong> <code class="def-code-arguments">f24:<var class="var">dst</var> x8:<var class="var">_</var> f24:<var class="var">src</var></code><a class="copiable-link" href="#index-long_002dfmov"> ¶</a></span></dt>
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<dd><p>Copy a value from one local slot to another, but addressing slots
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relative to the <code class="code">fp</code> instead of the <code class="code">sp</code>. This is used when
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shuffling values into place after multiple-value returns.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-push"><span class="category-def">Instruction: </span><span><strong class="def-name">push</strong> <code class="def-code-arguments">s24:<var class="var">src</var></code><a class="copiable-link" href="#index-push"> ¶</a></span></dt>
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<dd><p>Bump the stack pointer by one word, and fill it with the value from slot
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<var class="var">src</var>. The offset to <var class="var">src</var> is calculated before the stack
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pointer is adjusted.
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</p></dd></dl>
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<p>The <code class="code">push</code> instruction is used when another instruction is unable
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to address an operand because the operand is encoded with fewer than 24
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bits. In that case, Guile’s assembler will transparently emit code that
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temporarily pushes any needed operands onto the stack, emits the
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original instruction to address those now-near variables, then shuffles
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the result (if any) back into place.
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</p>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-pop"><span class="category-def">Instruction: </span><span><strong class="def-name">pop</strong> <code class="def-code-arguments">s24:<var class="var">dst</var></code><a class="copiable-link" href="#index-pop"> ¶</a></span></dt>
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<dd><p>Pop the stack pointer, storing the value that was there in slot
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<var class="var">dst</var>. The offset to <var class="var">dst</var> is calculated after the stack
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pointer is adjusted.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-drop-1"><span class="category-def">Instruction: </span><span><strong class="def-name">drop</strong> <code class="def-code-arguments">c24:<var class="var">count</var></code><a class="copiable-link" href="#index-drop-1"> ¶</a></span></dt>
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<dd><p>Pop the stack pointer by <var class="var">count</var> words, discarding any values that
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were stored there.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-shuffle_002ddown"><span class="category-def">Instruction: </span><span><strong class="def-name">shuffle-down</strong> <code class="def-code-arguments">f12:<var class="var">from</var> f12:<var class="var">to</var></code><a class="copiable-link" href="#index-shuffle_002ddown"> ¶</a></span></dt>
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<dd><p>Shuffle down values from <var class="var">from</var> to <var class="var">to</var>, reducing the frame size
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by <var class="var">FROM</var>-<var class="var">TO</var> slots. Part of the internal implementation of
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<code class="code">call-with-values</code>, <code class="code">values</code>, and <code class="code">apply</code>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-expand_002dapply_002dargument"><span class="category-def">Instruction: </span><span><strong class="def-name">expand-apply-argument</strong> <code class="def-code-arguments">x24:<var class="var">_</var></code><a class="copiable-link" href="#index-expand_002dapply_002dargument"> ¶</a></span></dt>
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<dd><p>Take the last local in a frame and expand it out onto the stack, as for
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the last argument to <code class="code">apply</code>.
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</p></dd></dl>
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Next: <a href="Trampoline-Instructions.html">Trampoline Instructions</a>, Previous: <a href="Function-Prologue-Instructions.html">Function Prologue 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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