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.
关注半导体供应链的朋友都知道，过去一年内存颗粒的价格一路狂飙。这在三星内部造就了一个奇特的景象：负责生产颗粒的半导体部门赚得盆满钵满，而负责造手机的移动通信部门却深陷成本上涨的泥潭。俗话说亲兄弟也要明算账，Galaxy S26 系列大容量版本不可避免地迎来了溢价：
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