因此,最新武装7结构的故事是什么? 我是否需要担心umb本汇编者在第二个链接参考资料上挂旗? 我能否安全使用<条码>杜布尔<>/条码>变量? 我正经历着386SX、DX和数学共同处理器的黑暗日子的突发。 引言我是2012年,我们已走。
In all of the iPhones, there is no reason double precision shouldn t be supported. They all use Cortex-A8 architecture with the cp15 coprocessor (which supports IEEE float and double calculations in hardware).
http://www.arm.com/products/processors/technologies/vector-floating-point.php
So yes, you can safely use doubles and it shouldn t be software emulated on the iPhones. Although this is done in hardware, it may still take more cycles to perform double mathemtic arithmatic vs single (float). In addition to using double, I would check to make sure the precision is appropriate for your application.
作为副注,如果加工商支持近地天体N指示集,则计算出的双倍和浮标比使用共同处理器更快。
EDIT:虽然VFP和Neon是ARM核心的选择性延伸,但大多数共同提纲-A8也有这种延长,所有使用都用于Pi和iPad。
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