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<p>Hi all,</p>
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</p>
<p>I am curious to know whether the Squeak Context model provides any operation to swap the latest two elements from the stack. Something like:</p>
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<div>doSwap</div>
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<div><span style="white-space:pre"></span> | first second |</div>
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<div><span style="white-space:pre"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px; white-space:pre"></span></span> first :=
self pop.</div>
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<div><span style="white-space:pre"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px; white-space:pre"></span></span> second
:= self pop.</div>
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<div><span style="white-space:pre"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px; white-space:pre"></span></span> self push:
first.</div>
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<div><span style="white-space:pre"><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px; white-space:pre"></span></span> self push:
second.</div>
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<p><br>
If it exists, I could not find it yet. If it does not exist, would you see any need to implement it (for both VM & simulation, of course)?</p>
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<p>To me, this appears to be the most performant approach to implement a <a href="http://forum.world.st/Problems-with-caseError-tp5111930p5112251.html" class="OWAAutoLink">
parametrized #caseError:</a>. Something like:</p>
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<div>81 <75> pushConstant: 0</div>
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<div>82 <88> dup</div>
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<div>83 <76> pushConstant: 1</div>
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<div>84 <B6> send: =</div>
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<div>85 <9A> jumpFalse: 89</div>
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<div>86 <87> pop</div>
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<div>87 <22> pushConstant: #one</div>
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<div>88 <96> jumpTo: 97</div>
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<div>89 <77> pushConstant: 2</div>
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<div>90 <B6> send: =</div>
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<div>91 <99> jumpFalse: 94</div>
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<div>92 <21> pushConstant: #two</div>
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<div>93 <91> jumpTo: 97</div>
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<div><b>94 <70> self</b></div>
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<div><b>95 <xx> swap</b></div>
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<div><b>96 <D0> send: caseError:</b></div>
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<div>97 <87> pop</div>
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<div>Otherwise, we would need an extra temporary variable here.</div>
Looking forward to your answers.
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<p>Best,</p>
<p>Christoph</p>
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