如何确定CPU对SSE3指令集的支持
问题:
是代码吗问题描述中提供的代码片段是检查 SSE3 指令集支持的有效方法吗?
答案:
不,该代码片段对于检查 SSE3 支持无效Windows XP。
解决方案:
这里有一个更可靠的方法来检测 CPU 对 SSE3 和各种其他指令集的支持:
代码:
#ifdef _WIN32 // Windows #define cpuid(info, x) __cpuidex(info, x, 0) #else // GCC Intrinsics #include <cpuid.h> void cpuid(int info[4], int InfoType) { __cpuid_count(InfoType, 0, info[0], info[1], info[2], info[3]); } #endif // Misc. bool HW_MMX; bool HW_x64; bool HW_ABM; // Advanced Bit Manipulation bool HW_RDRAND; bool HW_BMI1; bool HW_BMI2; bool HW_ADX; bool HW_PREFETCHWT1; // SIMD: 128-bit bool HW_SSE; bool HW_SSE2; bool HW_SSE3; bool HW_SSSE3; bool HW_SSE41; bool HW_SSE42; bool HW_SSE4a; bool HW_AES; bool HW_SHA; // SIMD: 256-bit bool HW_AVX; bool HW_XOP; bool HW_FMA3; bool HW_FMA4; bool HW_AVX2; // SIMD: 512-bit bool HW_AVX512F; // AVX512 Foundation bool HW_AVX512CD; // AVX512 Conflict Detection bool HW_AVX512PF; // AVX512 Prefetch bool HW_AVX512ER; // AVX512 Exponential + Reciprocal bool HW_AVX512VL; // AVX512 Vector Length Extensions bool HW_AVX512BW; // AVX512 Byte + Word bool HW_AVX512DQ; // AVX512 Doubleword + Quadword bool HW_AVX512IFMA; // AVX512 Integer 52-bit Fused Multiply-Add bool HW_AVX512VBMI; // AVX512 Vector Byte Manipulation Instructions int info[4]; cpuid(info, 0); int nIds = info[0]; cpuid(info, 0x80000000); unsigned nExIds = info[0]; // Detect Features if (nIds >= 0x00000001){ cpuid(info, 0x00000001); HW_MMX = (info[3] & ((int)1 << 23)) != 0; HW_SSE = (info[3] & ((int)1 << 25)) != 0; HW_SSE2 = (info[3] & ((int)1 << 26)) != 0; HW_SSE3 = (info[2] & ((int)1 << 0)) != 0; HW_SSSE3 = (info[2] & ((int)1 << 9)) != 0; HW_SSE41 = (info[2] & ((int)1 << 19)) != 0; HW_SSE42 = (info[2] & ((int)1 << 20)) != 0; HW_AES = (info[2] & ((int)1 << 25)) != 0; HW_AVX = (info[2] & ((int)1 << 28)) != 0; HW_FMA3 = (info[2] & ((int)1 << 12)) != 0; HW_RDRAND = (info[2] & ((int)1 << 30)) != 0; } if (nIds >= 0x00000007){ cpuid(info, 0x00000007); HW_AVX2 = (info[1] & ((int)1 << 5)) != 0; HW_BMI1 = (info[1] & ((int)1 << 3)) != 0; HW_BMI2 = (info[1] & ((int)1 << 8)) != 0; HW_ADX = (info[1] & ((int)1 << 19)) != 0; HW_SHA = (info[1] & ((int)1 << 29)) != 0; HW_PREFETCHWT1 = (info[2] & ((int)1 << 0)) != 0; HW_AVX512F = (info[1] & ((int)1 << 16)) != 0; HW_AVX512CD = (info[1] & ((int)1 << 28)) != 0; HW_AVX512PF = (info[1] & ((int)1 << 26)) != 0; HW_AVX512ER = (info[1] & ((int)1 << 27)) != 0; HW_AVX512VL = (info[1] & ((int)1 << 31)) != 0; HW_AVX512BW = (info[1] & ((int)1 << 30)) != 0; HW_AVX512DQ = (info[1] & ((int)1 << 17)) != 0; HW_AVX512IFMA = (info[1] & ((int)1 << 21)) != 0; HW_AVX512VBMI = (info[2] & ((int)1 << 1)) != 0; } if (nExIds >= 0x80000001){ cpuid(info, 0x80000001); HW_x64 = (info[3] & ((int)1 << 29)) != 0; HW_ABM = (info[2] & ((int)1 << 5)) != 0; HW_SSE4a = (info[2] & ((int)1 << 6)) != 0; HW_FMA4 = (info[2] & ((int)1 << 16)) != 0; HW_XOP = (info[2] & ((int)1 << 11)) != 0; }
使用此方法,可以在执行代码后通过检查 HW_SSE3 布尔变量来判断 CPU 是否支持 SSE3 指令集。
注意:
请记住,检测 CPU 支持只是一方面。要在代码中实际使用这些指令,您可能需要根据您使用的特定编程语言和操作系统进行调整。
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