1 files changed, 100 insertions, 0 deletions
diff --git a/third_party/dav1d/src/x86/cpu.c b/third_party/dav1d/src/x86/cpu.c
new file mode 100644
index 0000000000..764d8be8ef
--- /dev/null
+++ b/third_party/dav1d/src/x86/cpu.c
@@ -0,0 +1,100 @@
+/*
+ * 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 <string.h>
+
+#include "common/attributes.h"
+
+#include "src/x86/cpu.h"
+
+typedef struct {
+    uint32_t eax, ebx, edx, ecx;
+} 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) {
+    union {
+        CpuidRegisters r;
+        struct {
+            uint32_t max_leaf;
+            char vendor[12];
+        };
+    } cpu;
+    dav1d_cpu_cpuid(&cpu.r, 0, 0);
+    unsigned flags = 0;
+
+    if (cpu.max_leaf >= 1) {
+        CpuidRegisters r;
+        dav1d_cpu_cpuid(&r, 1, 0);
+        const unsigned model  = ((r.eax >> 4) & 0x0f) + ((r.eax >> 12) & 0xf0);
+        const unsigned family = ((r.eax >> 8) & 0x0f) + ((r.eax >> 20) & 0xff);
+
+        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 (cpu.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
+        if (!memcmp(cpu.vendor, "AuthenticAMD", sizeof(cpu.vendor))) {
+            if ((flags & DAV1D_X86_CPU_FLAG_AVX2) && (family < 0x19 ||
+                (family == 0x19 && (model < 0x10 || (model >= 0x20 && model < 0x60)))))
+            {
+                /* Excavator, Zen, Zen+, Zen 2, Zen 3, Zen 3+ */
+                flags |= DAV1D_X86_CPU_FLAG_SLOW_GATHER;
+            }
+        }
+    }
+
+    return flags;
+}