请问 Cortex-A7 支持 Thumb-2 指令集吗?
Cortex-M3 M4 是支持的.
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ARM claims that Thumb-2 instructions (for ARM Cortex cores and all ARMv7 processors) provides performance improvements and code size optimization:
https://en.wikipedia.org/wiki/ARM_Cortex-A7
Key features of the Cortex-A7 core are:
Partial dual-issue, in-order microarchitecture with an 8-stage pipeline[3]
NEON SIMD instruction set extension
VFPv4 Floating Point Unit
Thumb-2 instruction set encoding
Jazelle RCT
Hardware virtualization
Large Page Address Extensions (LPAE)
Integrated level 2 Cache (0–1 MB)
1.9 DMIPS / MHz[3]
Typical Clock Speed 1.5 GHz[3]看来 A7 应该是支持thumb-2指令集的.
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这样空间小些，对RAM和cache的压力小些，也许性能有提升，可以分别跑个分看看。
这个, 我去学习一下 ^_^
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