针对特定 CPU 架构进行编译
编写 C 或 C 代码时,通常需要了解您所针对的目标 CPU 架构编译。此信息可用于优化代码性能或确保与特定硬件的兼容性。不同的编译器利用各种非标准预处理器定义来区分 CPU 架构(例如,MSVS 中的 _M_X86、GCC 中的 i386__ 和 __arm)。
标准检测方法
不幸的是,在编译时检测CPU架构没有通用标准。但是,以下外部函数可以检测各种编译器的体系结构:
extern "C" { const char *getBuild() { #if defined(__x86_64__) || defined(_M_X64) return "x86_64"; #elif defined(i386) || defined(__i386__) || defined(__i386) || defined(_M_IX86) return "x86_32"; #elif defined(__ARM_ARCH_2__) return "ARM2"; #elif defined(__ARM_ARCH_3__) || defined(__ARM_ARCH_3M__) return "ARM3"; #elif defined(__ARM_ARCH_4T__) || defined(__TARGET_ARM_4T) return "ARM4T"; #elif defined(__ARM_ARCH_5_) || defined(__ARM_ARCH_5E_) return "ARM5" #elif defined(__ARM_ARCH_6T2_) || defined(__ARM_ARCH_6T2_) return "ARM6T2"; #elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) return "ARM6"; #elif defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) return "ARM7"; #elif defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) return "ARM7A"; #elif defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) return "ARM7R"; #elif defined(__ARM_ARCH_7M__) return "ARM7M"; #elif defined(__ARM_ARCH_7S__) return "ARM7S"; #elif defined(__aarch64__) || defined(_M_ARM64) return "ARM64"; #elif defined(mips) || defined(__mips__) || defined(__mips) return "MIPS"; #elif defined(__sh__) return "SUPERH"; #elif defined(__powerpc) || defined(__powerpc__) || defined(__powerpc64__) || defined(__POWERPC__) || defined(__ppc__) || defined(__PPC__) || defined(_ARCH_PPC) return "POWERPC"; #elif defined(__PPC64__) || defined(__ppc64__) || defined(_ARCH_PPC64) return "POWERPC64"; #elif defined(__sparc__) || defined(__sparc) return "SPARC"; #elif defined(__m68k__) return "M68K"; #else return "UNKNOWN"; #endif } }
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