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https://github.com/c64scene-ar/llvm-6502.git
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Added documentation for vset and vselect.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26264 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Robert Bocchino
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fb7217bea3
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7b81c758ab
@ -29,7 +29,7 @@
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</li>
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<li><a href="#typesystem">Type System</a>
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<ol>
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<li><a href="#t_primitive">Primitive Types</a>
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<li><a href="#t_primitive">Primitive Types</a>
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<ol>
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<li><a href="#t_classifications">Type Classifications</a></li>
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</ol>
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@ -96,9 +96,9 @@
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<li><a href="#i_malloc">'<tt>malloc</tt>' Instruction</a></li>
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<li><a href="#i_free">'<tt>free</tt>' Instruction</a></li>
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<li><a href="#i_alloca">'<tt>alloca</tt>' Instruction</a></li>
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<li><a href="#i_load">'<tt>load</tt>' Instruction</a></li>
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<li><a href="#i_store">'<tt>store</tt>' Instruction</a></li>
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<li><a href="#i_getelementptr">'<tt>getelementptr</tt>' Instruction</a></li>
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<li><a href="#i_load">'<tt>load</tt>' Instruction</a></li>
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<li><a href="#i_store">'<tt>store</tt>' Instruction</a></li>
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<li><a href="#i_getelementptr">'<tt>getelementptr</tt>' Instruction</a></li>
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</ol>
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</li>
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<li><a href="#otherops">Other Operations</a>
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@ -106,6 +106,8 @@
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<li><a href="#i_phi">'<tt>phi</tt>' Instruction</a></li>
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<li><a href="#i_cast">'<tt>cast .. to</tt>' Instruction</a></li>
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<li><a href="#i_select">'<tt>select</tt>' Instruction</a></li>
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<li><a href="#i_vset">'<tt>vset</tt>' Instruction</a></li>
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<li><a href="#i_vselect">'<tt>vselect</tt>' Instruction</a></li>
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<li><a href="#i_extractelement">'<tt>extractelement</tt>' Instruction</a></li>
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<li><a href="#i_insertelement">'<tt>insertelement</tt>' Instruction</a></li>
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<li><a href="#i_call">'<tt>call</tt>' Instruction</a></li>
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@ -1619,6 +1621,7 @@ Math Forum</a>.</p>
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<h5>Example:</h5>
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<pre> <result> = rem int 4, %var <i>; yields {int}:result = 4 % %var</i>
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</pre>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection"> <a name="i_setcc">'<tt>set<i>cc</i></tt>'
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@ -1664,6 +1667,7 @@ operand.</p>
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<result> = setge sbyte 4, 5 <i>; yields {bool}:result = false</i>
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</pre>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"> <a name="bitwiseops">Bitwise Binary
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Operations</a> </div>
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@ -2333,6 +2337,156 @@ value argument; otherwise, it returns the second value argument.
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</pre>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection"> <a name="i_vset">'<tt>vset</tt>'
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Instruction</a> </div>
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<div class="doc_text">
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<h5>Syntax:</h5>
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<pre><result> = vset <op>, <n x <ty>> <var1>, <var2> <i>; yields <n x bool></i>
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</pre>
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<h5>Overview:</h5>
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<p>The '<tt>vset</tt>' instruction returns a vector of boolean
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values representing, at each position, the result of the comparison
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between the values at that position in the two operands.</p>
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<h5>Arguments:</h5>
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<p>The arguments to a '<tt>vset</tt>' instruction are a comparison
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operation and two value arguments. The value arguments must be of <a
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href="#t_packed">packed</a> type, and they must have identical types.
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For value arguments of integral element type, the operation argument
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must be one of <tt>eq</tt>, <tt>ne</tt>, <tt>lt</tt>, <tt>gt</tt>,
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<tt>le</tt>, <tt>ge</tt>, <tt>ult</tt>, <tt>ugt</tt>, <tt>ule</tt>,
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<tt>uge</tt>, <tt>true</tt>, and <tt>false</tt>. For value arguments
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of floating point element type, the operation argument must be one of
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<tt>eq</tt>, <tt>ne</tt>, <tt>lt</tt>, <tt>gt</tt>, <tt>le</tt>,
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<tt>ge</tt>, <tt>oeq</tt>, <tt>one</tt>, <tt>olt</tt>, <tt>ogt</tt>,
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<tt>ole</tt>, <tt>oge</tt>, <tt>ueq</tt>, <tt>une</tt>, <tt>ult</tt>,
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<tt>ugt</tt>, <tt>ule</tt>, <tt>uge</tt>, <tt>o</tt>, <tt>u</tt>,
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<tt>true</tt>, and <tt>false</tt>. The result is a packed
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<tt>bool</tt> value with the same length as each operand.</p>
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<h5>Semantics:</h5>
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<p>The following table shows the semantics of '<tt>vset</tt>' for
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integral value arguments. For each position of the result, the
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comparison is done on the corresponding positions of the two value
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arguments. Note that the signedness of the comparison depends on the
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comparison opcode and <i>not</i> on the signedness of the value
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operands. E.g., <tt>vset lt <4 x unsigned> %x, %y</tt> does an
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elementwise <i>signed</i> comparison of <tt>%x</tt> and
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<tt>%y</tt>.</p>
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<table border="1" cellspacing="0" cellpadding="4">
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<tbody>
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<tr><th>Operation</th><th>Result is true iff</th><th>Comparison is</th></tr>
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<tr><td><tt>eq</tt></td><td>var1 == var2</td><td>--</td></tr>
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<tr><td><tt>ne</tt></td><td>var1 != var2</td><td>--</td></tr>
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<tr><td><tt>lt</tt></td><td>var1 < var2</td><td>signed</td></tr>
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<tr><td><tt>gt</tt></td><td>var1 > var2</td><td>signed</td></tr>
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<tr><td><tt>le</tt></td><td>var1 <= var2</td><td>signed</td></tr>
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<tr><td><tt>ge</tt></td><td>var1 >= var2</td><td>signed</td></tr>
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<tr><td><tt>ult</tt></td><td>var1 < var2</td><td>unsigned</td></tr>
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<tr><td><tt>ugt</tt></td><td>var1 > var2</td><td>unsigned</td></tr>
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<tr><td><tt>ule</tt></td><td>var1 <= var2</td><td>unsigned</td></tr>
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<tr><td><tt>uge</tt></td><td>var1 >= var2</td><td>unsigned</td></tr>
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<tr><td><tt>true</tt></td><td>always</td><td>--</td></tr>
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<tr><td><tt>false</tt></td><td>never</td><td>--</td></tr>
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</tbody>
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</table>
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<p>The following table shows the semantics of '<tt>vset</tt>' for
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floating point types. If either operand is a floating point Not a
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Number (NaN) value, the operation is unordered, and the value in the
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first column below is produced at that position. Otherwise, the
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operation is ordered, and the value in the second column is
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produced.</p>
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<table border="1" cellspacing="0" cellpadding="4">
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<tbody>
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<tr><th>Operation</th><th>If unordered<th>Otherwise true iff</th></tr>
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<tr><td><tt>eq</tt></td><td>undefined</td><td>var1 == var2</td></tr>
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<tr><td><tt>ne</tt></td><td>undefined</td><td>var1 != var2</td></tr>
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<tr><td><tt>lt</tt></td><td>undefined</td><td>var1 < var2</td></tr>
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<tr><td><tt>gt</tt></td><td>undefined</td><td>var1 > var2</td></tr>
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<tr><td><tt>le</tt></td><td>undefined</td><td>var1 <= var2</td></tr>
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<tr><td><tt>ge</tt></td><td>undefined</td><td>var1 >= var2</td></tr>
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<tr><td><tt>oeq</tt></td><td>false</td><td>var1 == var2</td></tr>
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<tr><td><tt>one</tt></td><td>false</td><td>var1 != var2</td></tr>
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<tr><td><tt>olt</tt></td><td>false</td><td>var1 < var2</td></tr>
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<tr><td><tt>ogt</tt></td><td>false</td><td>var1 > var2</td></tr>
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<tr><td><tt>ole</tt></td><td>false</td><td>var1 <= var2</td></tr>
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<tr><td><tt>oge</tt></td><td>false</td><td>var1 >= var2</td></tr>
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<tr><td><tt>ueq</tt></td><td>true</td><td>var1 == var2</td></tr>
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<tr><td><tt>une</tt></td><td>true</td><td>var1 != var2</td></tr>
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<tr><td><tt>ult</tt></td><td>true</td><td>var1 < var2</td></tr>
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<tr><td><tt>ugt</tt></td><td>true</td><td>var1 > var2</td></tr>
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<tr><td><tt>ule</tt></td><td>true</td><td>var1 <= var2</td></tr>
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<tr><td><tt>uge</tt></td><td>true</td><td>var1 >= var2</td></tr>
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<tr><td><tt>o</tt></td><td>false</td><td>always</td></tr>
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<tr><td><tt>u</tt></td><td>true</td><td>never</td></tr>
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<tr><td><tt>true</tt></td><td>true</td><td>always</td></tr>
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<tr><td><tt>false</tt></td><td>false</td><td>never</td></tr>
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</tbody>
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</table>
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<h5>Example:</h5>
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<pre> <result> = vset eq <2 x int> <int 0, int 1>, <int 1, int 0> <i>; yields {<2 x bool>}:result = false, false</i>
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<result> = vset ne <2 x int> <int 0, int 1>, <int 1, int 0> <i>; yields {<2 x bool>}:result = true, true</i>
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<result> = vset lt <2 x int> <int 0, int 1>, <int 1, int 0> <i>; yields {<2 x bool>}:result = true, false</i>
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<result> = vset gt <2 x int> <int 0, int 1>, <int 1, int 0> <i>; yields {<2 x bool>}:result = false, true</i>
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<result> = vset le <2 x int> <int 0, int 1>, <int 1, int 0> <i>; yields {<2 x bool>}:result = true, false</i>
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<result> = vset ge <2 x int> <int 0, int 1>, <int 1, int 0> <i>; yields {<2 x bool>}:result = false, true</i>
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</pre>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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<a name="i_vselect">'<tt>vselect</tt>' Instruction</a>
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</div>
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<div class="doc_text">
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<h5>Syntax:</h5>
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<pre>
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<result> = vselect <n x bool> <cond>, <n x <ty>> <val1>, <n x <ty>> <val2> <i>; yields <n x <ty>></i>
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</pre>
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<h5>Overview:</h5>
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<p>
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The '<tt>vselect</tt>' instruction chooses one value at each position
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of a vector based on a condition.
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</p>
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<h5>Arguments:</h5>
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<p>
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The '<tt>vselect</tt>' instruction requires a <a
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href="#t_packed">packed</a> <tt>bool</tt> value indicating the
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condition at each vector position, and two values of the same packed
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type. All three operands must have the same length. The type of the
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result is the same as the type of the two value operands.</p>
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<h5>Semantics:</h5>
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<p>
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At each position where the <tt>bool</tt> vector is true, that position
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of the result gets its value from the first value argument; otherwise,
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it gets its value from the second value argument.
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</p>
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<h5>Example:</h5>
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<pre>
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%X = vselect bool <2 x bool> <bool true, bool false>, <2 x ubyte> <ubyte 17, ubyte 17>,
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<2 x ubyte> <ubyte 42, ubyte 42> <i>; yields <2 x ubyte>:17, 42</i>
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</pre>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection">
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