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For PR950:
Documentation preview of the upcoming icmp and fcmp instructions that will replace the various setcc instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31859 91177308-0d34-0410-b5e6-96231b3b80d8
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Reid Spencer
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@ -83,7 +83,6 @@
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<li><a href="#i_urem">'<tt>urem</tt>' Instruction</a></li>
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<li><a href="#i_srem">'<tt>srem</tt>' Instruction</a></li>
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<li><a href="#i_frem">'<tt>frem</tt>' Instruction</a></li>
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<li><a href="#i_setcc">'<tt>set<i>cc</i></tt>' Instructions</a></li>
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</ol>
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</li>
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<li><a href="#bitwiseops">Bitwise Binary Operations</a>
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@ -96,6 +95,7 @@
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<li><a href="#i_ashr">'<tt>ashr</tt>' Instruction</a></li>
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</ol>
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</li>
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<li>
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<li><a href="#vectorops">Vector Operations</a>
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<ol>
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<li><a href="#i_extractelement">'<tt>extractelement</tt>' Instruction</a></li>
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@ -130,6 +130,8 @@
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</ol>
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<li><a href="#otherops">Other Operations</a>
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<ol>
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<li><a href="#i_icmp">'<tt>icmp</tt>' Instruction</a></li>
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<li><a href="#i_fcmp">'<tt>fcmp</tt>' Instruction</a></li>
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<li><a href="#i_phi">'<tt>phi</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_call">'<tt>call</tt>' Instruction</a></li>
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@ -1838,51 +1840,6 @@ identical types.</p>
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<h5>Example:</h5>
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<pre> <result> = frem float 4.0, %var <i>; yields {float}:result = 4.0 % %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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Instructions</a> </div>
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<div class="doc_text">
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<h5>Syntax:</h5>
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<pre> <result> = seteq <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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<result> = setne <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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<result> = setlt <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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<result> = setgt <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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<result> = setle <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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<result> = setge <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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</pre>
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<h5>Overview:</h5>
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<p>The '<tt>set<i>cc</i></tt>' family of instructions returns a boolean
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value based on a comparison of their two operands.</p>
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<h5>Arguments:</h5>
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<p>The two arguments to the '<tt>set<i>cc</i></tt>' instructions must
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be of <a href="#t_firstclass">first class</a> type (it is not possible
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to compare '<tt>label</tt>'s, '<tt>array</tt>'s, '<tt>structure</tt>'
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or '<tt>void</tt>' values, etc...). Both arguments must have identical
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types.</p>
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<h5>Semantics:</h5>
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<p>The '<tt>seteq</tt>' instruction yields a <tt>true</tt> '<tt>bool</tt>'
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value if both operands are equal.<br>
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The '<tt>setne</tt>' instruction yields a <tt>true</tt> '<tt>bool</tt>'
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value if both operands are unequal.<br>
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The '<tt>setlt</tt>' instruction yields a <tt>true</tt> '<tt>bool</tt>'
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value if the first operand is less than the second operand.<br>
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The '<tt>setgt</tt>' instruction yields a <tt>true</tt> '<tt>bool</tt>'
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value if the first operand is greater than the second operand.<br>
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The '<tt>setle</tt>' instruction yields a <tt>true</tt> '<tt>bool</tt>'
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value if the first operand is less than or equal to the second operand.<br>
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The '<tt>setge</tt>' instruction yields a <tt>true</tt> '<tt>bool</tt>'
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value if the first operand is greater than or equal to the second
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operand.</p>
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<h5>Example:</h5>
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<pre> <result> = seteq int 4, 5 <i>; yields {bool}:result = false</i>
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<result> = setne float 4, 5 <i>; yields {bool}:result = true</i>
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<result> = setlt uint 4, 5 <i>; yields {bool}:result = true</i>
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<result> = setgt sbyte 4, 5 <i>; yields {bool}:result = false</i>
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<result> = setle sbyte 4, 5 <i>; yields {bool}:result = true</i>
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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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@ -2537,7 +2494,7 @@ provided depend on the type of the first pointer argument. The
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levels of a structure or to a specific index in an array. When indexing into a
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structure, only <tt>uint</tt>
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integer constants are allowed. When indexing into an array or pointer,
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<tt>int</tt> and <tt>long</tt> indexes are allowed of any sign.</p>
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<tt>int</tt> and <tt>long</tt> and <tt>ulong</tt> indexes are allowed.</p>
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<p>For example, let's consider a C code fragment and how it gets
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compiled to LLVM:</p>
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@ -2578,7 +2535,7 @@ compiled to LLVM:</p>
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<p>The index types specified for the '<tt>getelementptr</tt>' instruction depend
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on the pointer type that is being indexed into. <a href="#t_pointer">Pointer</a>
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and <a href="#t_array">array</a> types require <tt>uint</tt>, <tt>int</tt>,
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and <a href="#t_array">array</a> types require <tt>int</tt>,
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<tt>ulong</tt>, or <tt>long</tt> values, and <a href="#t_struct">structure</a>
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types require <tt>uint</tt> <b>constants</b>.</p>
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@ -3083,6 +3040,163 @@ other types, use the <a href="#i_inttoptr">inttoptr</a> or
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<p>The instructions in this category are the "miscellaneous"
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instructions, which defy better classification.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsubsection"><a name="i_icmp">'<tt>icmp</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> <result> = icmp <cond> <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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</pre>
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<h5>Overview:</h5>
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<p>The '<tt>icmp</tt>' instruction returns a boolean value based on comparison
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of its two integer operands.</p>
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<h5>Arguments:</h5>
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<p>The '<tt>icmp</tt>' instruction takes three operands. The first operand is
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the condition code which indicates the kind of comparison to perform. It is not
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a value, just a keyword. The possibilities for the condition code are:
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<ol>
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<li><tt>eq</tt>: equal</li>
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<li><tt>ne</tt>: not equal </li>
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<li><tt>ugt</tt>: unsigned greater than</li>
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<li><tt>uge</tt>: unsigned greater or equal</li>
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<li><tt>ult</tt>: unsigned less than</li>
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<li><tt>ule</tt>: unsigned less or equal</li>
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<li><tt>sgt</tt>: signed greater than</li>
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<li><tt>sge</tt>: signed greater or equal</li>
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<li><tt>slt</tt>: signed less than</li>
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<li><tt>sle</tt>: signed less or equal</li>
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</ol>
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<p>The remaining two arguments must be of <a href="#t_integral">integral</a>,
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<a href="#t_pointer">pointer</a> or a <a href="#t_packed">packed</a> integral
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type. They must have identical types.</p>
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<h5>Semantics:</h5>
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<p>The '<tt>icmp</tt>' compares <tt>var1</tt> and <tt>var2</tt> according to
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the condition code given as <tt>cond</tt>. The comparison performed always
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yields a <a href="#t_bool">bool</a> result, as follows:
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<ol>
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<li><tt>eq</tt>: yields <tt>true</tt> if the operands are equal,
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<tt>false</tt> otherwise. No sign interpretation is necessary or performed.
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</li>
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<li><tt>ne</tt>: yields <tt>true</tt> if the operands are unequal,
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<tt>false</tt> otherwise. No sign interpretation is necessary or performed.
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<li><tt>ugt</tt>: interprets the operands as unsigned values and yields
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<tt>true</tt> if <tt>var1</tt> is greater than <tt>var2</tt>.</li>
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<li><tt>uge</tt>: interprets the operands as unsigned values and yields
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<tt>true</tt> if <tt>var1</tt> is greater than or equal to <tt>var2</tt>.</li>
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<li><tt>ult</tt>: interprets the operands as unsigned values and yields
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<tt>true</tt> if <tt>var1</tt> is less than <tt>var2</tt>.</li>
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<li><tt>ule</tt>: interprets the operands as unsigned values and yields
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<tt>true</tt> if <tt>var1</tt> is less than or equal to <tt>var2</tt>.</li>
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<li><tt>sgt</tt>: interprets the operands as signed values and yields
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<tt>true</tt> if <tt>var1</tt> is greater than <tt>var2</tt>.</li>
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<li><tt>sge</tt>: interprets the operands as signed values and yields
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<tt>true</tt> if <tt>var1</tt> is greater than or equal to <tt>var2</tt>.</li>
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<li><tt>slt</tt>: interprets the operands as signed values and yields
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<tt>true</tt> if <tt>var1</tt> is less than <tt>var2</tt>.</li>
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<li><tt>sle</tt>: interprets the operands as signed values and yields
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<tt>true</tt> if <tt>var1</tt> is less than or equal to <tt>var2</tt>.</li>
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</li>
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</ol>
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<p>If the operands are <a href="#t_pointer">pointer</a> typed, the pointer
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values are treated as integers and then compared.</p>
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<p>If the operands are <a href="#t_packed">packed</a> typed, the elements of
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the vector are compared in turn and the predicate must hold for all elements.
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While this is of dubious use for predicates other than <tt>eq</tt> and
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<tt>ne</tt>, the other predicates can be used with packed types.</p>
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<h5>Example:</h5>
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<pre> <result> = icmp eq int 4, 5 <i>; yields: result=false</i>
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<result> = icmp ne float* %X, %X <i>; yields: result=false</i>
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<result> = icmp ult short 4, 5 <i>; yields: result=true</i>
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<result> = icmp sgt sbyte 4, 5 <i>; yields: result=false</i>
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<result> = icmp ule sbyte -4, 5 <i>; yields: result=false</i>
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<result> = icmp sge sbyte 4, 5 <i>; yields: result=false</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_fcmp">'<tt>fcmp</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> <result> = fcmp <cond> <ty> <var1>, <var2> <i>; yields {bool}:result</i>
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</pre>
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<h5>Overview:</h5>
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<p>The '<tt>fcmp</tt>' instruction returns a boolean value based on comparison
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of its floating point operands.</p>
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<h5>Arguments:</h5>
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<p>The '<tt>fcmp</tt>' instruction takes three operands. The first operand is
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the condition code which indicates the kind of comparison to perform. It is not
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a value, just a keyword. The possibilities for the condition code are:
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<ol>
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<li><tt>false</tt>: no comparison, always false (always folded)</li>
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<li><tt>oeq</tt>: ordered and equal</li>
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<li><tt>ogt</tt>: ordered and greater than </li>
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<li><tt>oge</tt>: ordered and greater than or equal</li>
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<li><tt>olt</tt>: ordered and less than </li>
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<li><tt>ole</tt>: ordered and less than or equal</li>
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<li><tt>one</tt>: ordered and not equal</li>
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<li><tt>ord</tt>: ordered (no nans)</li>
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<li><tt>ueq</tt>: unordered or equal</li>
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<li><tt>ugt</tt>: unordered or greater than </li>
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<li><tt>uge</tt>: unordered or greater than or equal</li>
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<li><tt>ult</tt>: unordered or less than </li>
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<li><tt>ule</tt>: unordered or less than or equal</li>
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<li><tt>une</tt>: unordered or not equal</li>
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<li><tt>uno</tt>: unordered (either nans)</li>
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<li><tt>true</tt>: no comparison, always true (always folded)</li>
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</ol>
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<p>The <tt>val1</tt> and <tt>val2</tt> arguments must be of
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<a href="#t_floating">floating point</a>, or a <a href="#t_packed">packed</a>
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floating point type. They must have identical types.</p>
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<h5>Semantics:</h5>
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<p>The '<tt>fcmp</tt>' compares <tt>var1</tt> and <tt>var2</tt> according to
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the condition code given as <tt>cond</tt>. The comparison performed always
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yields a <a href="#t_bool">bool</a> result, as follows:
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<ol>
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<li><tt>false</tt>: always yields <tt>false</tt>, regardless of operands.</li>
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<li><tt>oeq</tt>: yields <tt>true</tt> if both operands are ordered and
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<tt>var1</tt> is equal to <tt>var2</tt>.</li>
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<li><tt>ogt</tt>: yields <tt>true</tt> if both operands are ordered and
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<tt>var1</tt> is greather than <tt>var2</tt>.</li>
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<li><tt>oge</tt>: yields <tt>true</tt> if both operands are ordered and
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<tt>var1</tt> is greater than or equal to <tt>var2</tt>.</li>
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<li><tt>olt</tt>: yields <tt>true</tt> if both operands are ordered and
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<tt>var1</tt> is less than <tt>var2</tt>.</li>
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<li><tt>ole</tt>: yields <tt>true</tt> if both operands are ordered and
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<tt>var1</tt> is less than or equal to <tt>var2</tt>.</li>
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<li><tt>one</tt>: yields <tt>true</tt> if both operands are ordered and
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<tt>var1</tt> is not equal to <tt>var2</tt>.</li>
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<li><tt>ord</tt>: yields <tt>true</tt> if both operands are ordered.</li>
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<li><tt>ueq</tt>: yields <tt>true</tt> if either operand is unordered or
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<tt>var1</tt> is equal to <tt>var2</tt>.</li>
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<li><tt>ugt</tt>: yields <tt>true</tt> if either operand is unordered or
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<tt>var1</tt> is greater than <tt>var2</tt>.</li>
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<li><tt>uge</tt>: yields <tt>true</tt> if either operand is unordered or
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<tt>var1</tt> is greater than or equal to <tt>var2</tt>.</li>
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<li><tt>ult</tt>: yields <tt>true</tt> if either operand is unordered or
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<tt>var1</tt> is less than <tt>var2</tt>.</li>
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<li><tt>ule</tt>: yields <tt>true</tt> if either operand is unordered or
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<tt>var1</tt> is less than or equal to <tt>var2</tt>.</li>
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<li><tt>une</tt>: yields <tt>true</tt> if either operand is unordered or
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<tt>var1</tt> is not equal to <tt>var2</tt>.</li>
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<li><tt>uno</tt>: yields <tt>true</tt> if either operand is unordered.</li>
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<li><tt>true</tt>: always yields <tt>true</tt>, regardless of operands.</li>
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</ol>
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<p>If the operands are <a href="#t_packed">packed</a> typed, the elements of
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the vector are compared in turn and the predicate must hold for all elements.
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While this is of dubious use for predicates other than <tt>eq</tt> and
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<tt>ne</tt>, the other predicates can be used with packed types.</p>
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<h5>Example:</h5>
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<pre> <result> = fcmp oeq float 4.0, 5.0 <i>; yields: result=false</i>
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<result> = icmp one float 4.0, 5.0 <i>; yields: result=true</i>
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<result> = icmp olt float 4.0, 5.0 <i>; yields: result=true</i>
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<result> = icmp ueq double 1.0, 2.0 <i>; yields: result=false</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_phi">'<tt>phi</tt>'
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Instruction</a> </div>
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