Difference between revisions of "Instruction Set/fmadn"

From Mill Computing Wiki
Jump to: navigation, search
 
(3 intermediate revisions by the same user not shown)
Line 1:Line 1:
 
{{DISPLAYTITLE:fmadn}}
 
{{DISPLAYTITLE:fmadn}}
−
<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 />
+
<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; [[Rounding|and rounds toward negative infinity]]<br />
−
'''native on:''' [[Cores/Decimal8|Decimal8]] [[Cores/Decimal16|Decimal16]] <br />
+
'''native on:''' [[Assembly|none]]<br />
 
</div>
 
</div>
  
−
fused multiply-add or -add/subtract
+
Decimal floating point fused multiply-add.
 +
As usual for those, it yields a higher precision than doing it separately, and is faster too.
 +
Rounds towards negative infinity.
 +
 
 
----
 
----
 
<code style="font-size:130%"><b style="color:#050">fmadn</b>(<span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">x</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">y</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops  
 
<code style="font-size:130%"><b style="color:#050">fmadn</b>(<span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">x</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">y</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops  
Line 10:Line 13:
 
<div style="font-size:80%;line-height:90%;margin-bottom:2em">'''operands:''' [[Operands#likeAddd|like Addd [dd:d]]]
 
<div style="font-size:80%;line-height:90%;margin-bottom:2em">'''operands:''' [[Operands#likeAddd|like Addd [dd:d]]]
 
</div>
 
</div>
−
<br />
+
Returns x*y+z on the belt.<br />
−
 
+
−
'''encoding:'''
+
−
<code style="font-size:100%"><b style="color:#050">fmadn</b>(<span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">x</span>)</code>
+
−
,
+
−
<code style="font-size:100%"><b style="color:#050">exuArgs</b>(<span style="color:#009">[[Domains#op|op]]</span> <span title="belt operand from ops window">arg0</span>, <span style="color:#009">[[Domains#op|op]]</span> <span title="belt operand from ops window">arg1</span>)</code>
+
−
<br />
+
−
 
+
−
{| class="mw-collapsible mw-collapsed wikitable" data-expandtext="&#9656;" data-collapsetext="&#9662;"
+
−
! [[Cores|Core]] || [[Slot|In Slots]]|| [[Latency|Latencies]]
+
−
|-
+
−
| [[Cores/Decimal8/Encoding#fmadn|Decimal8]] || E0 E1 || d,d:d=7 dv,dv:dv=7 q,q:q=8 qv,qv:qv=8
+
−
|-
+
−
| [[Cores/Decimal16/Encoding#fmadn|Decimal16]] || E0 E1 || d,d:d=7 dv,dv:dv=7 q,q:q=8 qv,qv:qv=8
+
−
|}
+
−
 
+
−
----
+
−
<code style="font-size:130%"><b style="color:#050">fmadn</b>(<span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">x</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">y</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops
+
−
            window">z</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">w</span>) &#8594; [[Domains#d|d]] r<sub>0</sub>, [[Domains#d|d]] r<sub>1</sub></code>
+
−
<div style="font-size:80%;line-height:90%;margin-bottom:2em">'''operands:''' [[Operands#likeFmasd|like Fmasd [dd:d]]]
+
−
</div>
+
−
<br />
+
−
 
+
−
'''encoding:'''
+
−
<code style="font-size:100%"><b style="color:#050">fmadn</b>(<span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">x</span>, <span style="color:#009">[[Domains#d|d]]</span> <span title="belt operand from ops window">y</span>)</code>
+
−
,
+
−
<code style="font-size:100%"><b style="color:#050">exuArgs</b>(<span style="color:#009">[[Domains#op|op]]</span> <span title="belt operand from ops window">arg0</span>, <span style="color:#009">[[Domains#op|op]]</span> <span title="belt operand from ops window">arg1</span>)</code>
+
−
<br />
+
−
 
+
−
{| class="mw-collapsible mw-collapsed wikitable" data-expandtext="&#9656;" data-collapsetext="&#9662;"
+
−
! [[Cores|Core]] || [[Slot|In Slots]]|| [[Latency|Latencies]]
+
−
|-
+
−
| [[Cores/Decimal8/Encoding#fmadn|Decimal8]] || E0 || d,d:d,d=7,7 dv,dv:dv,dv=7,7 q,q:q,q=8,8 qv,qv:qv,qv=8,8
+
−
|-
+
−
| [[Cores/Decimal16/Encoding#fmadn|Decimal16]] || E0 || d,d:d,d=7,7 dv,dv:dv,dv=7,7 q,q:q,q=8,8 qv,qv:qv,qv=8,8
+
−
|}
+
  
  
 
[[Instruction_Set|Instruction Set, alphabetical]], [[Instruction Set by Category]], [http://millcomputing.com/instructions.html?collapse=7#ops Instruction Set, sortable, filterable]
 
[[Instruction_Set|Instruction Set, alphabetical]], [[Instruction Set by Category]], [http://millcomputing.com/instructions.html?collapse=7#ops Instruction Set, sortable, filterable]

Latest revision as of 14:11, 23 February 2021

speculable  exu stream  exu block  compute phase   operation   in the decimal floating point value domain   and rounds toward negative infinity

native on: none

Decimal floating point fused multiply-add. As usual for those, it yields a higher precision than doing it separately, and is faster too. Rounds towards negative infinity.

fmadn(d x, d y, d z) → d r0

operands: like Addd [dd:d]

Returns x*y+z on the belt.


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

Retrieved from "http://millcomputing.com/w/index.php?title=Instruction_Set/fmadn&oldid=5325"