libc/arm: optimize crc32/crc32c for arm

Optimize crc32 standard(poly:0x04C11DB7) and crc32
castagnoli(poly:0x1EDC6F41) with arm crc32 extension instructions.

For example, crc32 standard caculates(lookup crc32 table) 1812 bytes data,
reduced the time from 118 us to 14 us through optimization.

Performance improved ~700%

Signed-off-by: Jinliang Li <lijinliang1@lixiang.com>

libs/libc/machine/arm/CMakeLists.txt

@@ -68,4 +68,8 @@ if(CONFIG_PROFILE_MINI)
   list(APPEND SRCS gnu/mcount.S)
 endif()
 
+if(CONFIG_LIBC_ARCH_CRC32)
+  list(APPEND SRCS arch_crc32.c)
+endif()
+
 target_sources(c PRIVATE ${SRCS})

libs/libc/machine/arm/Kconfig

@@ -31,3 +31,10 @@ endif
 if ARCH_ARMV8R
 source "libs/libc/machine/arm/armv8-r/Kconfig"
 endif
+
+config LIBC_ARCH_CRC32
+	bool "Enable optimized crc32 for ARM"
+	default n
+	depends on ARCH_HAVE_CRC32
+	---help---
+		Enable optimized arm neon specific crc32 library function

libs/libc/machine/arm/Make.defs

@@ -66,6 +66,10 @@ ifeq ($(CONFIG_PROFILE_MINI),y)
 ASRCS += mcount.S
 endif
 
+ifeq ($(CONFIG_LIBC_ARCH_CRC32),y)
+CSRCS += arch_crc32.c
+endif
+
 ifeq ($(CONFIG_ARCH_TOOLCHAIN_GNU),y)
 DEPPATH += --dep-path machine/arm/gnu
 VPATH += :machine/arm/gnu

libs/libc/machine/arm/arch_crc32.c

@@ -0,0 +1,115 @@
+/****************************************************************************
+ * libs/libc/machine/arm/arch_crc32.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <arm_acle.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: crc32part
+ *
+ * Description:
+ *   crc32 polynomial 0x04C11DB7 (bitreflected 0xEDB88320)
+ *
+ ****************************************************************************/
+
+uint32_t crc32part(FAR const uint8_t *src, size_t len, uint32_t crc32val)
+{
+  size_t i = 0;
+
+  for (; (i + 8) <= len; i += 8)
+    {
+      uint64_t data = *(uint64_t *)(src + i);
+      crc32val = __crc32d(crc32val, data);
+    }
+
+  if (i + 4 <= len)
+    {
+      uint32_t data = *(uint32_t *)(src + i);
+      crc32val = __crc32w(crc32val, data);
+      i += 4;
+    }
+
+  if (i + 2 <= len)
+    {
+      uint16_t data = *(uint16_t *)(src + i);
+      crc32val = __crc32h(crc32val, data);
+      i += 2;
+    }
+
+  if (i < len)
+    {
+      uint8_t data = *(uint8_t *)(src + i);
+      crc32val = __crc32b(crc32val, data);
+    }
+
+  return crc32val;
+}
+
+/****************************************************************************
+ * Name: crc32part_c
+ *
+ * Description:
+ *   crc32 Castagnoli polynomial 0x1EDC6F41
+ *
+ ****************************************************************************/
+
+uint32_t crc32part_c(FAR const uint8_t *src, size_t len, uint32_t crc32val)
+{
+  size_t i = 0;
+
+  for (; (i + 8) <= len; i += 8)
+    {
+      uint64_t data = *(uint64_t *)(src + i);
+      crc32val = __crc32cd(crc32val, data);
+    }
+
+  if (i + 4 <= len)
+    {
+      uint32_t data = *(uint32_t *)(src + i);
+      crc32val = __crc32cw(crc32val, data);
+      i += 4;
+    }
+
+  if (i + 2 <= len)
+    {
+      uint16_t data = *(uint16_t *)(src + i);
+      crc32val = __crc32ch(crc32val, data);
+      i += 2;
+    }
+
+  if (i < len)
+    {
+      uint8_t data = *(uint8_t *)(src + i);
+      crc32val = __crc32cb(crc32val, data);
+    }
+
+  return crc32val;
+}