Detecting SSE3 Instruction Set Support with CPUID Instructions
The provided code snippet attempts to determine if a CPU supports the SSE3 instruction set using the __cpuid() function. However, using IsProcessorFeaturePresent() is reportedly ineffective on Windows XP.
To effectively check for SSE3 support, we can delve deeper into CPUID instruction utilization:
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Accessing CPUID Instructions:
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Windows:
#define cpuid(info, x) __cpuidex(info, x, 0)
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GCC Intrinsics:
void cpuid(int info[4], int InfoType){ __cpuid_count(InfoType, 0, info[0], info[1], info[2], info[3]); }
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Feature Detection:
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Execute the following code:
int info[4]; cpuid(info, 0x00000001); bool HW_SSE3 = (info[2] & ((int)1 << 0)) != 0;
- This checks Bit 0 of the EFLAGS register where a set bit indicates SSE3 support.
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It's important to note that this method only detects CPU support for instructions. To execute them, operating system support is also necessary, particularly for:
- x64 Instructions: Requires a 64-bit OS
- AVX (256-bit) Instructions: Requires OS support
- AVX512 (512-bit) Instructions: Requires OS support, detectable with CPUID flag 0xe6
Thus, by employing these techniques, you can effectively determine whether a CPU supports the SSE3 instruction set, ensuring compatibility with your code.
The above is the detailed content of How can I determine if a CPU supports the SSE3 instruction set?. For more information, please follow other related articles on the PHP Chinese website!

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