M000018.html in ruby-vpi-21.0.0

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-  <title>extend_sign (Integer)</title>
+  <title>unpack (Integer)</title>
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-  <pre><span class="ruby-comment cmt"># File lib/ruby-vpi/integer.rb, line 97</span>
-  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">extend_sign</span> <span class="ruby-identifier">aOrigWidth</span>, <span class="ruby-identifier">aExtWidth</span>
-    <span class="ruby-identifier">result</span> = <span class="ruby-keyword kw">self</span>
-    <span class="ruby-identifier">maskWidth</span> = <span class="ruby-identifier">aExtWidth</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">aOrigWidth</span>
+  <pre><span class="ruby-comment cmt"># File lib/ruby-vpi/integer.rb, line 76</span>
+  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">unpack</span> <span class="ruby-identifier">aPackedWidth</span>
+    <span class="ruby-identifier">bits</span> = <span class="ruby-identifier">length</span>
 
-    <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">maskWidth</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">0</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">result</span>[<span class="ruby-identifier">aOrigWidth</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>] <span class="ruby-operator">==</span> <span class="ruby-value">1</span>
-      <span class="ruby-identifier">result</span> <span class="ruby-operator">|=</span> (<span class="ruby-identifier">maskWidth</span>.<span class="ruby-identifier">to_mask</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">aOrigWidth</span>)
+    <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">aPackedWidth</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-identifier">bits</span>
+      <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-node">&quot;packed width #{aPackedWidth} must be at least #{bits} for integer #{self}&quot;</span>
     <span class="ruby-keyword kw">end</span>
 
-    <span class="ruby-identifier">result</span> <span class="ruby-operator">&amp;</span> <span class="ruby-identifier">aExtWidth</span>.<span class="ruby-identifier">to_mask</span>
+    <span class="ruby-identifier">mask</span> = <span class="ruby-identifier">aPackedWidth</span>.<span class="ruby-identifier">to_mask</span>
+    <span class="ruby-identifier">result</span> = <span class="ruby-keyword kw">self</span> <span class="ruby-operator">&amp;</span> <span class="ruby-identifier">mask</span>
+
+    <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">result</span>[<span class="ruby-identifier">aPackedWidth</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>] <span class="ruby-operator">==</span> <span class="ruby-value">1</span>
+      <span class="ruby-operator">-</span>((<span class="ruby-operator">-</span><span class="ruby-identifier">result</span>) <span class="ruby-operator">&amp;</span> <span class="ruby-identifier">mask</span>)
+    <span class="ruby-keyword kw">else</span>
+      <span class="ruby-identifier">result</span>
+    <span class="ruby-keyword kw">end</span>
   <span class="ruby-keyword kw">end</span></pre>
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