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<title>s390 Aliases - Using as</title>
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<link rel="up" href="s390-Syntax.html#s390-Syntax" title="s390 Syntax">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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<div class="node">
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<a name="s390-Aliases"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="s390-Operand-Modifier.html#s390-Operand-Modifier">s390 Operand Modifier</a>,
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Previous: <a rel="previous" accesskey="p" href="s390-Formats.html#s390-Formats">s390 Formats</a>,
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Up: <a rel="up" accesskey="u" href="s390-Syntax.html#s390-Syntax">s390 Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.41.3.5 Instruction Aliases</h5>
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<p><a name="index-instruction-aliases_002c-s390-2076"></a><a name="index-s390-instruction-aliases-2077"></a>
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A specific bit pattern can have multiple mnemonics, for example
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the bit pattern ‘<samp><span class="samp">0xa7000000</span></samp>’ has the mnemonics ‘<samp><span class="samp">tmh</span></samp>’ and
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‘<samp><span class="samp">tmlh</span></samp>’. In addition, there are a number of mnemonics recognized by
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<code>as</code> that are not present in the Principles of Operation.
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These are the short forms of the branch instructions, where the condition
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code mask operand is encoded in the mnemonic. This is relevant for the
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branch instructions, the compare and branch instructions, and the
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compare and trap instructions.
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<p>For the branch instructions there are 20 condition code strings that can
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be used as part of the mnemonic in place of a mask operand in the instruction
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format:
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<pre class="display">
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<p><table summary=""><tr align="left"><th valign="top" width="30%">instruction </th><th valign="top" width="30%">short form
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<br></th></tr><tr align="left"><td valign="top" width="30%">bcr M1,R2 </td><td valign="top" width="30%">b<m>r R2
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<br></td></tr><tr align="left"><td valign="top" width="30%">bc M1,D2(X2,B2) </td><td valign="top" width="30%">b<m> D2(X2,B2)
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<br></td></tr><tr align="left"><td valign="top" width="30%">brc M1,I2 </td><td valign="top" width="30%">j<m> I2
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<br></td></tr><tr align="left"><td valign="top" width="30%">brcl M1,I2 </td><td valign="top" width="30%">jg<m> I2
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<br></td></tr></table>
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</pre>
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<p>In the mnemonic for a branch instruction the condition code string <m>
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can be any of the following:
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<pre class="display">
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<p><table summary=""><tr align="left"><td valign="top">o </td><td valign="top">jump on overflow / if ones
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<br></td></tr><tr align="left"><td valign="top">h </td><td valign="top">jump on A high
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<br></td></tr><tr align="left"><td valign="top">p </td><td valign="top">jump on plus
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<br></td></tr><tr align="left"><td valign="top">nle </td><td valign="top">jump on not low or equal
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<br></td></tr><tr align="left"><td valign="top">l </td><td valign="top">jump on A low
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<br></td></tr><tr align="left"><td valign="top">m </td><td valign="top">jump on minus
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<br></td></tr><tr align="left"><td valign="top">nhe </td><td valign="top">jump on not high or equal
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<br></td></tr><tr align="left"><td valign="top">lh </td><td valign="top">jump on low or high
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<br></td></tr><tr align="left"><td valign="top">ne </td><td valign="top">jump on A not equal B
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<br></td></tr><tr align="left"><td valign="top">nz </td><td valign="top">jump on not zero / if not zeros
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<br></td></tr><tr align="left"><td valign="top">e </td><td valign="top">jump on A equal B
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<br></td></tr><tr align="left"><td valign="top">z </td><td valign="top">jump on zero / if zeroes
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<br></td></tr><tr align="left"><td valign="top">nlh </td><td valign="top">jump on not low or high
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<br></td></tr><tr align="left"><td valign="top">he </td><td valign="top">jump on high or equal
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<br></td></tr><tr align="left"><td valign="top">nl </td><td valign="top">jump on A not low
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<br></td></tr><tr align="left"><td valign="top">nm </td><td valign="top">jump on not minus / if not mixed
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<br></td></tr><tr align="left"><td valign="top">le </td><td valign="top">jump on low or equal
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<br></td></tr><tr align="left"><td valign="top">nh </td><td valign="top">jump on A not high
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<br></td></tr><tr align="left"><td valign="top">np </td><td valign="top">jump on not plus
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<br></td></tr><tr align="left"><td valign="top">no </td><td valign="top">jump on not overflow / if not ones
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<br></td></tr></table>
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</pre>
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<p>For the compare and branch, and compare and trap instructions there
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are 12 condition code strings that can be used as part of the mnemonic in
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place of a mask operand in the instruction format:
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<pre class="display">
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<p><table summary=""><tr align="left"><th valign="top" width="40%">instruction </th><th valign="top" width="40%">short form
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<br></th></tr><tr align="left"><td valign="top" width="40%">crb R1,R2,M3,D4(B4) </td><td valign="top" width="40%">crb<m> R1,R2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">cgrb R1,R2,M3,D4(B4) </td><td valign="top" width="40%">cgrb<m> R1,R2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">crj R1,R2,M3,I4 </td><td valign="top" width="40%">crj<m> R1,R2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">cgrj R1,R2,M3,I4 </td><td valign="top" width="40%">cgrj<m> R1,R2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">cib R1,I2,M3,D4(B4) </td><td valign="top" width="40%">cib<m> R1,I2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">cgib R1,I2,M3,D4(B4) </td><td valign="top" width="40%">cgib<m> R1,I2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">cij R1,I2,M3,I4 </td><td valign="top" width="40%">cij<m> R1,I2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">cgij R1,I2,M3,I4 </td><td valign="top" width="40%">cgij<m> R1,I2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">crt R1,R2,M3 </td><td valign="top" width="40%">crt<m> R1,R2
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<br></td></tr><tr align="left"><td valign="top" width="40%">cgrt R1,R2,M3 </td><td valign="top" width="40%">cgrt<m> R1,R2
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<br></td></tr><tr align="left"><td valign="top" width="40%">cit R1,I2,M3 </td><td valign="top" width="40%">cit<m> R1,I2
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<br></td></tr><tr align="left"><td valign="top" width="40%">cgit R1,I2,M3 </td><td valign="top" width="40%">cgit<m> R1,I2
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<br></td></tr><tr align="left"><td valign="top" width="40%">clrb R1,R2,M3,D4(B4) </td><td valign="top" width="40%">clrb<m> R1,R2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">clgrb R1,R2,M3,D4(B4) </td><td valign="top" width="40%">clgrb<m> R1,R2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">clrj R1,R2,M3,I4 </td><td valign="top" width="40%">clrj<m> R1,R2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">clgrj R1,R2,M3,I4 </td><td valign="top" width="40%">clgrj<m> R1,R2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">clib R1,I2,M3,D4(B4) </td><td valign="top" width="40%">clib<m> R1,I2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">clgib R1,I2,M3,D4(B4) </td><td valign="top" width="40%">clgib<m> R1,I2,D4(B4)
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<br></td></tr><tr align="left"><td valign="top" width="40%">clij R1,I2,M3,I4 </td><td valign="top" width="40%">clij<m> R1,I2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">clgij R1,I2,M3,I4 </td><td valign="top" width="40%">clgij<m> R1,I2,I4
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<br></td></tr><tr align="left"><td valign="top" width="40%">clrt R1,R2,M3 </td><td valign="top" width="40%">clrt<m> R1,R2
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<br></td></tr><tr align="left"><td valign="top" width="40%">clgrt R1,R2,M3 </td><td valign="top" width="40%">clgrt<m> R1,R2
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<br></td></tr><tr align="left"><td valign="top" width="40%">clfit R1,I2,M3 </td><td valign="top" width="40%">clfit<m> R1,I2
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<br></td></tr><tr align="left"><td valign="top" width="40%">clgit R1,I2,M3 </td><td valign="top" width="40%">clgit<m> R1,I2
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<br></td></tr></table>
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</pre>
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<p>In the mnemonic for a compare and branch and compare and trap instruction
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the condition code string <m> can be any of the following:
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<pre class="display">
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<p><table summary=""><tr align="left"><td valign="top">h </td><td valign="top">jump on A high
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<br></td></tr><tr align="left"><td valign="top">nle </td><td valign="top">jump on not low or equal
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<br></td></tr><tr align="left"><td valign="top">l </td><td valign="top">jump on A low
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<br></td></tr><tr align="left"><td valign="top">nhe </td><td valign="top">jump on not high or equal
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<br></td></tr><tr align="left"><td valign="top">ne </td><td valign="top">jump on A not equal B
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<br></td></tr><tr align="left"><td valign="top">lh </td><td valign="top">jump on low or high
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<br></td></tr><tr align="left"><td valign="top">e </td><td valign="top">jump on A equal B
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<br></td></tr><tr align="left"><td valign="top">nlh </td><td valign="top">jump on not low or high
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<br></td></tr><tr align="left"><td valign="top">nl </td><td valign="top">jump on A not low
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<br></td></tr><tr align="left"><td valign="top">he </td><td valign="top">jump on high or equal
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<br></td></tr><tr align="left"><td valign="top">nh </td><td valign="top">jump on A not high
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<br></td></tr><tr align="left"><td valign="top">le </td><td valign="top">jump on low or equal
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<br></td></tr></table>
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</pre>
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