Difference between revisions of "Instruction Set/rrootd"

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(Created page with "{{DISPLAYTITLE:rrootd}} <div style="font-size:80%;line-height:90%;margin-bottom:2em">realizing  exu stream Decode|exu block...")
 
 
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{{DISPLAYTITLE:rrootd}}
 
{{DISPLAYTITLE:rrootd}}
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<div style="font-size:80%;line-height:90%;margin-bottom:2em">[[Speculation|realizing]]&nbsp;&nbsp;[[Encoding|exu stream]]&nbsp;&nbsp;[[Decode|exu block]]&nbsp;&nbsp;[[Phasing|compute phase]]&nbsp;&nbsp; operation&nbsp;&nbsp; [[Domains|in the decimal floating point value domain]]&nbsp;&nbsp;<br />
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<div style="font-size:80%;line-height:90%;margin-bottom:2em">[[Speculation|speculable]]&nbsp;&nbsp;[[Encoding|exu stream]]&nbsp;&nbsp;[[Decode|exu block]]&nbsp;&nbsp;[[Phasing|compute phase]]&nbsp;&nbsp; operation&nbsp;&nbsp; [[Domains|in the decimal floating point value domain]]&nbsp;&nbsp; [[Condition Code|that produces condition codes]] [[Rounding|and rounds use current dynamic rounding mode]]<br />
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'''native on:''' [[Cores/Decimal8|Decimal8]] [[Cores/Decimal16|Decimal16]] <br />
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'''native on:''' [[Assembly|none]]<br />
 
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</div>
  
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reciprocal square root
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Decimal float reciprocal square root.
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i.e. the result is 1/&#8730;x.
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This operation doesn't need rounding since no precision is lost.
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<code style="font-size:130%"><b style="color:#050">rrootd</b>(<span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">x</span>) &#8594; [[Domains#d|d]] r<sub>0</sub></code>
 
<code style="font-size:130%"><b style="color:#050">rrootd</b>(<span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">x</span>) &#8594; [[Domains#d|d]] r<sub>0</sub></code>
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{| class="mw-collapsible mw-collapsed wikitable" data-expandtext="&#9656;" data-collapsetext="&#9662;"
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! [[Cores|Core]] || [[Slot|In Slots]]|| [[Latency|Latencies]]
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[[Instruction_Set|Instruction Set, alphabetical]], [[Instruction Set by Category]], [http://millcomputing.com/instructions.html?collapse=7#ops Instruction Set, sortable, filterable]
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|-
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| [[Cores/Decimal8/Encoding#750|Decimal8]] || E0 E1 || d:d=4 dv:dv=4 q:q=5 qv:qv=5
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|-
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| [[Cores/Decimal16/Encoding#750|Decimal16]] || E0 E1 || d:d=4 dv:dv=4 q:q=5 qv:qv=5
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|}
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Latest revision as of 13:24, 23 February 2021

speculable  exu stream  exu block  compute phase   operation   in the decimal floating point value domain   that produces condition codes and rounds use current dynamic rounding mode

native on: none

Decimal float reciprocal square root. i.e. the result is 1/√x.

This operation doesn't need rounding since no precision is lost.

rrootd(d x) → d r0

operands: like Addd [dd:d]



Instruction Set, alphabetical, Instruction Set by Category, Instruction Set, sortable, filterable

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