/* * Copyright © 2018, VideoLAN and dav1d authors * Copyright © 2018, Two Orioles, LLC * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this *    list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, *    this list of conditions and the following disclaimer in the documentation *    and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include <stdint.h> #include "common/attributes.h" #include "src/x86/cpu.h" typedef struct {    uint32_t eax, ebx, ecx, edx;} CpuidRegisters; void dav1d_cpu_cpuid(CpuidRegisters *regs, unsigned leaf, unsigned subleaf);uint64_t dav1d_cpu_xgetbv(unsigned xcr); #define X(reg, mask) (((reg) & (mask)) == (mask)) COLD unsigned dav1d_get_cpu_flags_x86(void) {    CpuidRegisters r = { 0 };    dav1d_cpu_cpuid(&r, 0, 0);    const unsigned max_leaf = r.eax;    unsigned flags = 0;     if (max_leaf >= 1) {        dav1d_cpu_cpuid(&r, 1, 0);        if (X(r.edx, 0x06008000)) /* CMOV/SSE/SSE2 */ {            flags |= DAV1D_X86_CPU_FLAG_SSE2;            if (X(r.ecx, 0x00000201)) /* SSE3/SSSE3 */ {                flags |= DAV1D_X86_CPU_FLAG_SSSE3;                if (X(r.ecx, 0x00080000)) /* SSE4.1 */                    flags |= DAV1D_X86_CPU_FLAG_SSE41;            }        }#if ARCH_X86_64        /* We only support >128-bit SIMD on x86-64. */        if (X(r.ecx, 0x18000000)) /* OSXSAVE/AVX */ {            const uint64_t xcr0 = dav1d_cpu_xgetbv(0);            if (X(xcr0, 0x00000006)) /* XMM/YMM */ {                if (max_leaf >= 7) {                    dav1d_cpu_cpuid(&r, 7, 0);                    if (X(r.ebx, 0x00000128)) /* BMI1/BMI2/AVX2 */ {                        flags |= DAV1D_X86_CPU_FLAG_AVX2;                        if (X(xcr0, 0x000000e0)) /* ZMM/OPMASK */ {                            if (X(r.ebx, 0xd0230000) && X(r.ecx, 0x00005f42))                                flags |= DAV1D_X86_CPU_FLAG_AVX512ICL;                        }                    }                }            }        }#endif    }     return flags;}