Speculative execution did not appear overnight. It emerged gradually from techniques that loosened strict sequential execution. In 1967, Robert Tomasulo’s work on the IBM System/360 Model 91 introduced dynamic scheduling and register renaming, allowing instructions to execute out of order without violating program semantics. Around the same time, James Thornton’s scoreboard in the CDC 6600 kept pipelines active in the presence of hazards. These mechanisms did not speculate—but they removed structural barriers that once forced processors to stall. Once out-of-order execution became viable, speculation became irresistible.
scale. Lab's L runs 0-100, a and b span roughly ±128, while LCH's C goes
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HP said in February that RAM accounts for a third of its PC costs, and industry analysts expect the RAM shortage could radically alter the PC landscape as companies are forced to raise prices. Valve's already struggling to keep the Steam Deck in stock due to its issues securing RAM, it stands to reason sourcing components for even more devices wouldn't make that process any easier. Then again, the company hasn’t updated its launch timing FAQ, so there’s still reason to hope the Steam Machine ships in 2026.
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