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CPU (Linux): detects march on aarch64

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Carter Li
2025-08-25 14:44:32 +08:00
committed by 李通洲
parent 7611d672b7
commit dd1a799abb
3 changed files with 256 additions and 70 deletions
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src/detection/cpu/cpu.h
+1 -70
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@@ -33,73 +33,4 @@ typedef struct FFCPUResult
const char* ffDetectCPU(const FFCPUOptions* options, FFCPUResult* cpu);
const char* ffCPUAppleCodeToName(uint32_t code);
const char* ffCPUQualcommCodeToName(uint32_t code);
#if defined(__x86_64__) || defined(__i386__)
#include <cpuid.h>
inline static void ffCPUDetectByCpuid(FFCPUResult* cpu)
{
uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
if (__get_cpuid(0x16, &eax, &ebx, &ecx, &edx))
{
// WARNING: CPUID may report frequencies of efficient cores
// cpuid returns 0 MHz when hypervisor is enabled
if (eax) cpu->frequencyBase = eax;
if (ebx) cpu->frequencyMax = ebx;
}
if (__get_cpuid(1, &eax, &ebx, &ecx, &edx))
{
// Feature tests (leaf1.ecx, leaf7.ebx)
bool sse2 = (ecx & bit_SSE2) != 0;
bool sse4_2 = (ecx & bit_SSE4_2) != 0;
bool pclmul = (ecx & bit_PCLMUL) != 0;
bool popcnt = (ecx & bit_POPCNT) != 0;
bool fma = (ecx & bit_FMA) != 0;
bool osxsave = (ecx & bit_OSXSAVE) != 0;
unsigned int eax7 = 0, ebx7 = 0, ecx7 = 0, edx7 = 0;
__get_cpuid_count(7, 0, &eax7, &ebx7, &ecx7, &edx7);
bool avx2 = (ebx7 & bit_AVX2) != 0;
bool bmi2 = (ebx7 & bit_BMI2) != 0;
bool avx512f = (ebx7 & bit_AVX512F) != 0;
bool avx512bw = (ebx7 & bit_AVX512BW) != 0;
bool avx512dq = (ebx7 & bit_AVX512DQ) != 0;
// OS support for AVX/AVX512: check XGETBV (requires OSXSAVE)
bool avx_os = false;
bool avx512_os = false;
if (osxsave)
{
__asm__ __volatile__(
"xgetbv"
: "=a"(eax), "=d"(edx)
: "c"(0)
:
);
uint64_t xcr0 = ((uint64_t)edx << 32) | eax;
// AVX requires XCR0[1:2] == 11b (XMM and YMM state)
avx_os = (xcr0 & 0x6ULL) == 0x6ULL;
// AVX512 requires XCR0[7,5,6] etc. common mask 0xE6 (bits 1,2,5,6,7)
avx512_os = (xcr0 & 0xE6ULL) == 0xE6ULL;
}
cpu->march = "unknown";
if (avx512f && avx512bw && avx512dq && avx512_os) cpu->march = "x86_64-v4";
else if (avx2 && fma && bmi2 && avx_os) cpu->march = "x86_64-v3";
else if (sse4_2 && popcnt && pclmul) cpu->march = "x86_64-v2";
else if (sse2) cpu->march = "x86_64-v1";
}
}
#else
inline static void ffCPUDetectByCpuid(FF_MAYBE_UNUSED FFCPUResult* cpu)
{
// Unsupported platform
}
#endif
void ffCPUDetectByCpuid(FFCPUResult* cpu);