3, David Mertz, IBM developerWorks. Series of articles
iOS 6、Windows Phone 8 以及 Android 4.1，图片来自 TechRadar三段式导航是最典型的例子。Windows Phone 底部永远只有三个按键：返回、开始、搜索。这种逻辑带来一种确定性，即无论你深入多少层级，按返回键都能一步步退回之前的应用页面和操作原点，而不是像 Android 那样最终被直接抛回桌面。
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If you ever want a good laugh, ask an academic to explain what they get paid to do, and who pays them to do it.
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.
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