The aarch64 instruction set has a madd instruction that performs integer multiply-adds. Cortex A725 and older Arm cores had dedicated integer multi-cycle pipes that could handle madd along with other complex integer instructions. Cortex X925 instead breaks madd into two micro-ops, and handles it with any of its four multiply-capable integer pipes. Likely, Arm wanted to increase throughput for that instruction without the cost of implementing three register file read ports for each multiply-capable pipe. Curiously, Arm’s optimization guide refers to the fourth scheduler’s pipes as “single/multi-cycle” pipes. “Multi-cycle” is now a misnomer though, because the core’s “single-cycle” integer pipes can handle multiplies, which have two cycle latency. On Cortex X925, “multi-cycle” pipes distinguish themselves by handling special operations and being able to access FP/vector related registers.
Within hours of that announcement, OpenAI said it had struck its own deal with the Pentagon — a move Anthropic has called “mendacious” and the public appears to view similarly. Within 24 hours of the back-to-back announcements, Anthropic’s Claude shot to the top of the free-app rankings on Apple’s U.S. App Store, overtaking ChatGPT. (At the end of January, Claude was outside the top 100, according to Sensor Tower data.)
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