ARM 指令集版本和ARM 版本

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ARM指令集不像x86指令集没有变化，ARM指令集目前为止分为8种，ARMv1,v2,v3,v4,v5,v6,v7,v8真是乱糟糟，为什么指令集变来变去的？

Main article: List of ARM microprocessor cores

ArchitectureFamilyARMv1ARM1ARMv2ARM2, ARM3ARMv3ARM6, ARM7ARMv4StrongARM, ARM7TDMI, ARM9TDMIARMv5ARM7EJ, ARM9E, ARM10E, XScaleARMv6ARM11, ARM Cortex-MARMv7ARM Cortex-A, ARM Cortex-M, ARM Cortex-RARMv864位指令集,芯片有Cortex-50等

当使用ARM toolchain时，会有-march -mcpu等。

-mcpu=

-mtune=

他们指定目标处理器（target ARM processor）。

可选的参数为：arm2', `arm250', `arm3', `arm6', `arm60', `arm600', `arm610', `arm620', `arm7', `arm7m', `arm7d', `arm7dm', `arm7di', `arm7dmi', `arm70', `arm700', `arm700i', `arm710', `arm710c', `arm7100', `arm7500', `arm7500fe', `arm7tdmi', `arm7tdmi-s', `arm8', `strongarm', `strongarm110', `strongarm1100', `arm8', `arm810', `arm9', `arm9e', `arm920', `arm920t', `arm922t', `arm946e-s', `arm966e-s', `arm968e-s', `arm926ej-s', `arm940t', `arm9tdmi', `arm10tdmi', `arm1020t', `arm1026ej-s', `arm10e', `arm1020e', `arm1022e', `arm1136j-s', `arm1136jf-s', `mpcore', `mpcorenovfp', `arm1176jz-s', `arm1176jzf-s', `xscale', `iwmmxt', `ep9312'，Cortex-A8， Cortex-A9

-march=

target ARM architecture。目标处理器架构。

`armv2', `armv2a', `armv3', `armv3m', `armv4', `armv4t', `armv5', `armv5t', `armv5te', `armv6', `armv6j', `iwmmxt', `ep9312'. armv7-a等。