1 files changed, 61 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/arm/crc32/hash_arm_crc32.c b/third_party/aom/av1/encoder/arm/crc32/hash_arm_crc32.c
new file mode 100644
index 0000000000..91fc1e00a5
--- /dev/null
+++ b/third_party/aom/av1/encoder/arm/crc32/hash_arm_crc32.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2022, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#if defined(_MSC_VER) && !defined(__clang__)
+#include <intrin.h>
+#else
+#include <arm_acle.h>
+#endif
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "config/aom_config.h"
+
+#define CRC_LOOP(op, crc, type, buf, len) \
+  while ((len) >= sizeof(type)) {         \
+    (crc) = op((crc), *(type *)(buf));    \
+    (len) -= sizeof(type);                \
+    buf += sizeof(type);                  \
+  }
+
+#define CRC_SINGLE(op, crc, type, buf, len) \
+  if ((len) >= sizeof(type)) {              \
+    (crc) = op((crc), *(type *)(buf));      \
+    (len) -= sizeof(type);                  \
+    buf += sizeof(type);                    \
+  }
+
+/* Return 32-bit CRC for the input buffer.
+ * Polynomial is 0x1EDC6F41.
+ */
+
+uint32_t av1_get_crc32c_value_arm_crc32(void *crc_calculator, uint8_t *p,
+                                        size_t len) {
+  (void)crc_calculator;
+  const uint8_t *buf = p;
+  uint32_t crc = 0xFFFFFFFF;
+
+#if !AOM_ARCH_AARCH64
+  // Align input to 8-byte boundary (only necessary for 32-bit builds.)
+  while (len && ((uintptr_t)buf & 7)) {
+    crc = __crc32cb(crc, *buf++);
+    len--;
+  }
+#endif
+
+  CRC_LOOP(__crc32cd, crc, uint64_t, buf, len)
+  CRC_SINGLE(__crc32cw, crc, uint32_t, buf, len)
+  CRC_SINGLE(__crc32ch, crc, uint16_t, buf, len)
+  CRC_SINGLE(__crc32cb, crc, uint8_t, buf, len)
+
+  return ~crc;
+}