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| <h5 class="subsubsection">9.31.3.5 Instruction Aliases</h5> |
| |
| <p><a name="index-instruction-aliases_002c-s390-1542"></a><a name="index-s390-instruction-aliases-1543"></a> |
| A specific bit pattern can have multiple mnemonics, for example |
| the bit pattern ‘<samp><span class="samp">0xa7000000</span></samp>’ has the mnemonics ‘<samp><span class="samp">tmh</span></samp>’ and |
| ‘<samp><span class="samp">tmlh</span></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>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: |
| |
| <pre class="display"> |
| <p><table summary=""><tr align="left"><th valign="top" width="30%">instruction </th><th valign="top" width="30%">short form |
| <br></th></tr><tr align="left"><td valign="top" width="30%">bcr M1,R2 </td><td valign="top" width="30%">b<m>r R2 |
| <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) |
| <br></td></tr><tr align="left"><td valign="top" width="30%">brc M1,I2 </td><td valign="top" width="30%">j<m> I2 |
| <br></td></tr><tr align="left"><td valign="top" width="30%">brcl M1,I2 </td><td valign="top" width="30%">jg<m> I2 |
| <br></td></tr></table> |
| </pre> |
| <p>In the mnemonic for a branch instruction the condition code string <m> |
| can be any of the following: |
| |
| <pre class="display"> |
| <p><table summary=""><tr align="left"><td valign="top">o </td><td valign="top">jump on overflow / if ones |
| <br></td></tr><tr align="left"><td valign="top">h </td><td valign="top">jump on A high |
| <br></td></tr><tr align="left"><td valign="top">p </td><td valign="top">jump on plus |
| <br></td></tr><tr align="left"><td valign="top">nle </td><td valign="top">jump on not low or equal |
| <br></td></tr><tr align="left"><td valign="top">l </td><td valign="top">jump on A low |
| <br></td></tr><tr align="left"><td valign="top">m </td><td valign="top">jump on minus |
| <br></td></tr><tr align="left"><td valign="top">nhe </td><td valign="top">jump on not high or equal |
| <br></td></tr><tr align="left"><td valign="top">lh </td><td valign="top">jump on low or high |
| <br></td></tr><tr align="left"><td valign="top">ne </td><td valign="top">jump on A not equal B |
| <br></td></tr><tr align="left"><td valign="top">nz </td><td valign="top">jump on not zero / if not zeros |
| <br></td></tr><tr align="left"><td valign="top">e </td><td valign="top">jump on A equal B |
| <br></td></tr><tr align="left"><td valign="top">z </td><td valign="top">jump on zero / if zeroes |
| <br></td></tr><tr align="left"><td valign="top">nlh </td><td valign="top">jump on not low or high |
| <br></td></tr><tr align="left"><td valign="top">he </td><td valign="top">jump on high or equal |
| <br></td></tr><tr align="left"><td valign="top">nl </td><td valign="top">jump on A not low |
| <br></td></tr><tr align="left"><td valign="top">nm </td><td valign="top">jump on not minus / if not mixed |
| <br></td></tr><tr align="left"><td valign="top">le </td><td valign="top">jump on low or equal |
| <br></td></tr><tr align="left"><td valign="top">nh </td><td valign="top">jump on A not high |
| <br></td></tr><tr align="left"><td valign="top">np </td><td valign="top">jump on not plus |
| <br></td></tr><tr align="left"><td valign="top">no </td><td valign="top">jump on not overflow / if not ones |
| <br></td></tr></table> |
| </pre> |
| <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: |
| |
| <pre class="display"> |
| <p><table summary=""><tr align="left"><th valign="top" width="40%">instruction </th><th valign="top" width="40%">short form |
| <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) |
| <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) |
| <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 |
| <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 |
| <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) |
| <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) |
| <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 |
| <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 |
| <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 |
| <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 |
| <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 |
| <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 |
| <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) |
| <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) |
| <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 |
| <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 |
| <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) |
| <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) |
| <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 |
| <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 |
| <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 |
| <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 |
| <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 |
| <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 |
| <br></td></tr></table> |
| </pre> |
| <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: |
| |
| <pre class="display"> |
| <p><table summary=""><tr align="left"><td valign="top">h </td><td valign="top">jump on A high |
| <br></td></tr><tr align="left"><td valign="top">nle </td><td valign="top">jump on not low or equal |
| <br></td></tr><tr align="left"><td valign="top">l </td><td valign="top">jump on A low |
| <br></td></tr><tr align="left"><td valign="top">nhe </td><td valign="top">jump on not high or equal |
| <br></td></tr><tr align="left"><td valign="top">ne </td><td valign="top">jump on A not equal B |
| <br></td></tr><tr align="left"><td valign="top">lh </td><td valign="top">jump on low or high |
| <br></td></tr><tr align="left"><td valign="top">e </td><td valign="top">jump on A equal B |
| <br></td></tr><tr align="left"><td valign="top">nlh </td><td valign="top">jump on not low or high |
| <br></td></tr><tr align="left"><td valign="top">nl </td><td valign="top">jump on A not low |
| <br></td></tr><tr align="left"><td valign="top">he </td><td valign="top">jump on high or equal |
| <br></td></tr><tr align="left"><td valign="top">nh </td><td valign="top">jump on A not high |
| <br></td></tr><tr align="left"><td valign="top">le </td><td valign="top">jump on low or equal |
| <br></td></tr></table> |
| </pre> |
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