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An Interview with Josh Fisher: Inventing VLIW, Multiflow, Itanium, VLIW’s Massive Success

Apr 30, 2026
Josh Fisher, Emeritus Senior Fellow at Hewlett‑Packard and VLIW pioneer, tells first‑hand stories from inventing trace scheduling to founding Multiflow. He tackles myths about VLIW’s failure, explains why it thrived in embedded and AI hardware, and recounts business, engineering, and Itanium‑era dilemmas in multiple candid vignettes.
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INSIGHT

VLIW Ships Billions In Hidden Markets

  • VLIW is widely successful in volume despite failing in visible general-purpose markets.
  • Josh Fisher estimates ~5–15 billion VLIW processors ship yearly, mostly in low-cost embedded devices, not desktops.
ANECDOTE

How Trace Scheduling Made VLIW Practical

  • Fisher invented trace scheduling to convert readable sequential code into wide instruction words automatically.
  • At Yale he built a compiler-first approach (Bulldog) showing C-level programs could be compiled into VLIW instruction bundles.
ANECDOTE

Multiflow Was Fast But Ran Out Of Money

  • Multiflow built machines that dispatched up to 28 operations in parallel but still failed as a business.
  • Fisher describes running out of financing as the real cause, not technical shortcomings in performance or compiler quality.
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