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TimothyLottes
2016-11-09 19:26:49 -05:00
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20160706.html
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<html><head><link rel="stylesheet" href="style.css"></head><body><div class="page">
<h1>20160706 - Low Cost Branching to Factoring Out Loop Exit Check</h1>
<br>
Threading to hide pipeline depth combined with an ISA which makes branching cheep is one goal.
Specifically absolute branching with immediate destination in the opcode word
(single word branch/call, no adder), and instructions which include a return flag (make returns free).
Enables easy computed branches, both for jump tables, and loops.
Can factor out loop check into hierarchical call tree,
<br>
<br><tt>
Do4: Unroll work four times; Return;<br>
Do16: Call Do4; Call Do4; Call Do4; Jump Do4;<br>
Do64: Call Do16; Call Do16; Call Do16; Jump Do16;<br>
... etc ...
</tt><br>
<br>
Can use a computed branch to jump into the tree for other loop counts.
</div></body></html>
index.html
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<a href="20160721.html">20160721 - Why Motion Blur Trivially Breaks Tone-Mapping - Part 1</a><br>
<a href="20160720.html">20160720 - Re Twitter: Thoughts on Vulkan Command Buffers</a><br>
<a href="20160715.html">20160715 - LED Displays</a><br>
<a href="20160706.html">20160706 - Low Cost Branching to Factoring Out Loop Exit Check</a><br>
<a href="20160127.html">20160127 - Temporal AA Neighborhood Clamp</a><br>
<br>
<b>2015</b><br>