66 lines
2.7 KiB
HTML
66 lines
2.7 KiB
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<html lang="en">
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<title>Additional Notes - SBCL Internals</title>
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<link rel="up" href="Calling-Convention.html#Calling-Convention" title="Calling Convention">
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<link rel="prev" href="IR2-Conversion.html#IR2-Conversion" title="IR2 Conversion">
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This manual is part of the SBCL software system. See the `README'
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file for more information.
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This manual is in the public domain and is provided with
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absolutely no warranty. See the `COPYING' and `CREDITS' files for
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<div class="node">
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<p>
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<a name="Additional-Notes"></a>
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Previous: <a rel="previous" accesskey="p" href="IR2-Conversion.html#IR2-Conversion">IR2 Conversion</a>,
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Up: <a rel="up" accesskey="u" href="Calling-Convention.html#Calling-Convention">Calling Convention</a>
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</div>
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<h3 class="section">2.6 Additional Notes</h3>
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<p>The low-hanging fruit here is going to be changing every call
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and return to use <code>CALL</code> and <code>RETURN</code> instructions
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instead of <code>JMP</code> instructions.
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<p>A more involved change would be to reduce the number of argument
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passing registers from three to two, which may be beneficial in
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terms of our quest to free up a GPR for use on Win32 boxes for a
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thread structure.
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<p>Another possible win could be to store multiple return-values
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somewhere other than the stack, such as a dedicated area of the
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thread structure. The main concern here in terms of clobbering
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would be to make sure that interrupts (and presumably the
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internal-error machinery) know to save the area and that the
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compiler knows that the area cannot be live across a function
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call. Actually implementing this would involve hacking the IR2
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conversion, since as it stands now the same argument conventions
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are used for both call and return value storage (same TNs).
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</body></html>
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