


Does the Code Snippet Provided in the Problem Description Accurately Check for SSE3 Instruction Set Support?
Nov 16, 2024 am 03:15 AMHow to Determine CPU Support for SSE3 Instruction Set
Question:
Is the code snippet provided in the problem description a valid way to check for SSE3 instruction set support?
Answer:
No, the code snippet is not valid for checking SSE3 support on Windows XP.
Solution:
Here's a more reliable method for detecting CPU support for SSE3 and various other instruction sets:
Code:
#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; }
Using this method, you can determine whether a CPU supports the SSE3 instruction set by checking the HW_SSE3 boolean variable after executing the code.
Note:
Keep in mind that detecting CPU support is only one aspect. To actually utilize these instructions in your code, you may need to make adjustments based on the specific programming language and operating system you are using.
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