[gentoo-project] Looking for someone with AVX-512 capable CPU

[Michał Górny]

Hi,

I'm looking for someone having AVX-512 capable CPU, for the purpose of
XSAVE support development in LLDB.  If you have such a CPU, could you
compile and run the following program, and send me the output?  If you
could in the future provide me with a shell account (unprivileged user
is sufficient) to build and test LLDB, that'd be even better.

The program is meant to grab offsets and sizes of XSAVE components.  It
should run unprivileged.  However, it might require a new-ish kernel. 
TIA.

---

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>

#include <cpuid.h>

int main()
{
	int i;
	uint32_t eax, ebx, ecx, edx;
	uint64_t xcr0;

	asm volatile(
		"xorq %%rcx, %%rcx\n\t"
		"xgetbv\n\t"
		: "=a"(eax), "=d"(edx)
		:
		:
	);

	printf("XCR0: EAX = %08" PRIx32 "; EDX = %08" PRIx32 "\n", eax, edx);
	xcr0 = ((uint64_t)edx << 32) | eax;

	if (!__get_cpuid_count(0x0D, 0, &eax, &ebx, &ecx, &edx))
		return 0;

	printf("0Dh(0): EAX = %08" PRIx32 "; EDX = %08" PRIx32 "\n", eax, edx);
	printf("0Dh(0): ECX = %" PRId32 "; EBX = %" PRId32 "\n", ecx, ebx);

	for (i = 2; i < 64; ++i)
	{
		if (!(xcr0 & ((uint64_t)1 << i)))
			continue;

		__cpuid_count(0x0D, i, eax, ebx, ecx, edx);
		printf("0Dh(%d): EAX = %" PRId32 "; EBX = %" PRId32 "; ECX = %"
				PRIx32 "\n", i, eax, ebx, ecx);
	}
}



-- 
Best regards,
Michał Górny