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| Next: <a href="s390-Operand-Modifier.html#s390-Operand-Modifier" accesskey="n" rel="next">s390 Operand Modifier</a>, Previous: <a href="s390-Formats.html#s390-Formats" accesskey="p" rel="prev">s390 Formats</a>, Up: <a href="s390-Syntax.html#s390-Syntax" accesskey="u" rel="up">s390 Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Instruction-Aliases"></a> |
| <h4 class="subsubsection">9.37.3.5 Instruction Aliases</h4> |
| <a name="index-instruction-aliases_002c-s390"></a> |
| <a name="index-s390-instruction-aliases"></a> |
| |
| <p>A specific bit pattern can have multiple mnemonics, for example |
| the bit pattern ‘<samp>0xa7000000</samp>’ has the mnemonics ‘<samp>tmh</samp>’ and |
| ‘<samp>tmlh</samp>’. In addition, there are a number of mnemonics recognized by |
| <code>as</code> that are not present in the Principles of Operation. |
| These are the short forms of the branch instructions, where the condition |
| code mask operand is encoded in the mnemonic. This is relevant for the |
| branch instructions, the compare and branch instructions, and the |
| compare and trap instructions. |
| </p> |
| <p>For the branch instructions there are 20 condition code strings that can |
| be used as part of the mnemonic in place of a mask operand in the instruction |
| format: |
| </p> |
| <div class="display"> |
| <table> |
| <thead><tr><th width="30%"><pre class="display">instruction</pre></th><th width="30%"><pre class="display">short form</pre></th></tr></thead> |
| <tr><td width="30%"><pre class="display">bcr M1,R2</pre></td><td width="30%"><pre class="display">b<m>r R2</pre></td></tr> |
| <tr><td width="30%"><pre class="display">bc M1,D2(X2,B2)</pre></td><td width="30%"><pre class="display">b<m> D2(X2,B2)</pre></td></tr> |
| <tr><td width="30%"><pre class="display">brc M1,I2</pre></td><td width="30%"><pre class="display">j<m> I2</pre></td></tr> |
| <tr><td width="30%"><pre class="display">brcl M1,I2</pre></td><td width="30%"><pre class="display">jg<m> I2</pre></td></tr> |
| </table> |
| </div> |
| |
| <p>In the mnemonic for a branch instruction the condition code string <m> |
| can be any of the following: |
| </p> |
| <div class="display"> |
| <table> |
| <tr><td><pre class="display">o</pre></td><td><pre class="display">jump on overflow / if ones</pre></td></tr> |
| <tr><td><pre class="display">h</pre></td><td><pre class="display">jump on A high</pre></td></tr> |
| <tr><td><pre class="display">p</pre></td><td><pre class="display">jump on plus</pre></td></tr> |
| <tr><td><pre class="display">nle</pre></td><td><pre class="display">jump on not low or equal</pre></td></tr> |
| <tr><td><pre class="display">l</pre></td><td><pre class="display">jump on A low</pre></td></tr> |
| <tr><td><pre class="display">m</pre></td><td><pre class="display">jump on minus</pre></td></tr> |
| <tr><td><pre class="display">nhe</pre></td><td><pre class="display">jump on not high or equal</pre></td></tr> |
| <tr><td><pre class="display">lh</pre></td><td><pre class="display">jump on low or high</pre></td></tr> |
| <tr><td><pre class="display">ne</pre></td><td><pre class="display">jump on A not equal B</pre></td></tr> |
| <tr><td><pre class="display">nz</pre></td><td><pre class="display">jump on not zero / if not zeros</pre></td></tr> |
| <tr><td><pre class="display">e</pre></td><td><pre class="display">jump on A equal B</pre></td></tr> |
| <tr><td><pre class="display">z</pre></td><td><pre class="display">jump on zero / if zeroes</pre></td></tr> |
| <tr><td><pre class="display">nlh</pre></td><td><pre class="display">jump on not low or high</pre></td></tr> |
| <tr><td><pre class="display">he</pre></td><td><pre class="display">jump on high or equal</pre></td></tr> |
| <tr><td><pre class="display">nl</pre></td><td><pre class="display">jump on A not low</pre></td></tr> |
| <tr><td><pre class="display">nm</pre></td><td><pre class="display">jump on not minus / if not mixed</pre></td></tr> |
| <tr><td><pre class="display">le</pre></td><td><pre class="display">jump on low or equal</pre></td></tr> |
| <tr><td><pre class="display">nh</pre></td><td><pre class="display">jump on A not high</pre></td></tr> |
| <tr><td><pre class="display">np</pre></td><td><pre class="display">jump on not plus</pre></td></tr> |
| <tr><td><pre class="display">no</pre></td><td><pre class="display">jump on not overflow / if not ones</pre></td></tr> |
| </table> |
| </div> |
| |
| <p>For the compare and branch, and compare and trap instructions there |
| are 12 condition code strings that can be used as part of the mnemonic in |
| place of a mask operand in the instruction format: |
| </p> |
| <div class="display"> |
| <table> |
| <thead><tr><th width="40%"><pre class="display">instruction</pre></th><th width="40%"><pre class="display">short form</pre></th></tr></thead> |
| <tr><td width="40%"><pre class="display">crb R1,R2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">crb<m> R1,R2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cgrb R1,R2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">cgrb<m> R1,R2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">crj R1,R2,M3,I4</pre></td><td width="40%"><pre class="display">crj<m> R1,R2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cgrj R1,R2,M3,I4</pre></td><td width="40%"><pre class="display">cgrj<m> R1,R2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cib R1,I2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">cib<m> R1,I2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cgib R1,I2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">cgib<m> R1,I2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cij R1,I2,M3,I4</pre></td><td width="40%"><pre class="display">cij<m> R1,I2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cgij R1,I2,M3,I4</pre></td><td width="40%"><pre class="display">cgij<m> R1,I2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">crt R1,R2,M3</pre></td><td width="40%"><pre class="display">crt<m> R1,R2</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cgrt R1,R2,M3</pre></td><td width="40%"><pre class="display">cgrt<m> R1,R2</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cit R1,I2,M3</pre></td><td width="40%"><pre class="display">cit<m> R1,I2</pre></td></tr> |
| <tr><td width="40%"><pre class="display">cgit R1,I2,M3</pre></td><td width="40%"><pre class="display">cgit<m> R1,I2</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clrb R1,R2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">clrb<m> R1,R2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clgrb R1,R2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">clgrb<m> R1,R2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clrj R1,R2,M3,I4</pre></td><td width="40%"><pre class="display">clrj<m> R1,R2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clgrj R1,R2,M3,I4</pre></td><td width="40%"><pre class="display">clgrj<m> R1,R2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clib R1,I2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">clib<m> R1,I2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clgib R1,I2,M3,D4(B4)</pre></td><td width="40%"><pre class="display">clgib<m> R1,I2,D4(B4)</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clij R1,I2,M3,I4</pre></td><td width="40%"><pre class="display">clij<m> R1,I2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clgij R1,I2,M3,I4</pre></td><td width="40%"><pre class="display">clgij<m> R1,I2,I4</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clrt R1,R2,M3</pre></td><td width="40%"><pre class="display">clrt<m> R1,R2</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clgrt R1,R2,M3</pre></td><td width="40%"><pre class="display">clgrt<m> R1,R2</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clfit R1,I2,M3</pre></td><td width="40%"><pre class="display">clfit<m> R1,I2</pre></td></tr> |
| <tr><td width="40%"><pre class="display">clgit R1,I2,M3</pre></td><td width="40%"><pre class="display">clgit<m> R1,I2</pre></td></tr> |
| </table> |
| </div> |
| |
| <p>In the mnemonic for a compare and branch and compare and trap instruction |
| the condition code string <m> can be any of the following: |
| </p> |
| <div class="display"> |
| <table> |
| <tr><td><pre class="display">h</pre></td><td><pre class="display">jump on A high</pre></td></tr> |
| <tr><td><pre class="display">nle</pre></td><td><pre class="display">jump on not low or equal</pre></td></tr> |
| <tr><td><pre class="display">l</pre></td><td><pre class="display">jump on A low</pre></td></tr> |
| <tr><td><pre class="display">nhe</pre></td><td><pre class="display">jump on not high or equal</pre></td></tr> |
| <tr><td><pre class="display">ne</pre></td><td><pre class="display">jump on A not equal B</pre></td></tr> |
| <tr><td><pre class="display">lh</pre></td><td><pre class="display">jump on low or high</pre></td></tr> |
| <tr><td><pre class="display">e</pre></td><td><pre class="display">jump on A equal B</pre></td></tr> |
| <tr><td><pre class="display">nlh</pre></td><td><pre class="display">jump on not low or high</pre></td></tr> |
| <tr><td><pre class="display">nl</pre></td><td><pre class="display">jump on A not low</pre></td></tr> |
| <tr><td><pre class="display">he</pre></td><td><pre class="display">jump on high or equal</pre></td></tr> |
| <tr><td><pre class="display">nh</pre></td><td><pre class="display">jump on A not high</pre></td></tr> |
| <tr><td><pre class="display">le</pre></td><td><pre class="display">jump on low or equal</pre></td></tr> |
| </table> |
| </div> |
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