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				/*-
				* Copyright (c) 2024 Robert Clausecker <fuz@FreeBSD.org>
				*
				* SPDX-License-Identifier: BSD-2-Clause
				*/

				#include <sys/types.h>
				#include <sys/md5.h>

				#include <machine/cpufunc.h>
				#include <machine/specialreg.h>
				#include <stdint.h>
				#include <string.h>
				#include <x86/ifunc.h>

				extern void _libmd_md5block_baseline(MD5_CTX , const void , size_t);
				extern void _libmd_md5block_bmi1(MD5_CTX , const void , size_t);
				extern void _libmd_md5block_avx512(MD5_CTX , const void , size_t);

				DEFINE_UIFUNC(, void, _libmd_md5block, (MD5_CTX , const void , size_t))
				{
				if ((cpu_stdext_feature & (CPUID_STDEXT_AVX512F \| CPUID_STDEXT_AVX512VL))
				== (CPUID_STDEXT_AVX512F \| CPUID_STDEXT_AVX512VL)) {
				u_int regs[4];
				char cpu_vendor[12];

				do_cpuid(0, regs);
				((u_int *)&cpu_vendor)[0] = regs[1];
				((u_int *)&cpu_vendor)[1] = regs[3];
				((u_int *)&cpu_vendor)[2] = regs[2];

				/* the AVX-512 kernel performs poorly on AMD */
				if (memcmp(cpu_vendor, AMD_VENDOR_ID, sizeof(cpu_vendor)) != 0)
				return (_libmd_md5block_avx512);
				}

				if (cpu_stdext_feature & CPUID_STDEXT_BMI1)
				return (_libmd_md5block_bmi1);
				else
				return (_libmd_md5block_baseline);
				}