projects / OpenSPARC-T2-DV / blame
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| 54 | ||
| 55 | <H1><A NAME="SECTION007700000000000000000"></A><A NAME="shifting"></A> | |
| 56 | <BR> | |
| 57 | 5.7 Shifting operations | |
| 58 | </H1> | |
| 59 | <a id='l2h-421' xml:id='l2h-421'></a> | |
| 60 | <P> | |
| 61 | The shifting operations have lower priority than the arithmetic | |
| 62 | operations: | |
| 63 | ||
| 64 | <P> | |
| 65 | <dl><dd class="grammar"> | |
| 66 | <div class="productions"> | |
| 67 | <table> | |
| 68 | <tr> | |
| 69 | <td><a id='tok-shift_expr' xml:id='tok-shift_expr'>shift_expr</a></td> | |
| 70 | <td>::=</td> | |
| 71 | <td><a class='grammartoken' href="binary.html#tok-a_expr">a_expr</a> | |
| 72 | | <a class='grammartoken' href="shifting.html#tok-shift_expr">shift_expr</a> ( "<<" | ">>" ) <a class='grammartoken' href="binary.html#tok-a_expr">a_expr</a></td></tr> | |
| 73 | </table> | |
| 74 | </div> | |
| 75 | <a class="grammar-footer" | |
| 76 | href="grammar.txt" type="text/plain" | |
| 77 | >Download entire grammar as text.</a> | |
| 78 | </dd></dl> | |
| 79 | ||
| 80 | <P> | |
| 81 | These operators accept plain or long integers as arguments. The | |
| 82 | arguments are converted to a common type. They shift the first | |
| 83 | argument to the left or right by the number of bits given by the | |
| 84 | second argument. | |
| 85 | ||
| 86 | <P> | |
| 87 | A right shift by <var>n</var> bits is defined as division by | |
| 88 | <code>pow(2,<var>n</var>)</code>. A left shift by <var>n</var> bits is defined as | |
| 89 | multiplication with <code>pow(2,<var>n</var>)</code>; for plain integers there is | |
| 90 | no overflow check so in that case the operation drops bits and flips | |
| 91 | the sign if the result is not less than <code>pow(2,31)</code> in absolute | |
| 92 | value. Negative shift counts raise a <tt class="exception">ValueError</tt> | |
| 93 | exception. | |
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| 131 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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