Initial Release

src/common/pico_bit_ops/CMakeLists.txt

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+if (NOT TARGET pico_bit_ops_headers)
+    add_library(pico_bit_ops_headers INTERFACE)
+    target_include_directories(pico_bit_ops_headers INTERFACE ${CMAKE_CURRENT_LIST_DIR}/include)
+    target_link_libraries(pico_bit_ops_headers INTERFACE pico_base_headers)
+endif()

src/common/pico_bit_ops/include/pico/bit_ops.h

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+/*
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef _PICO_BIT_OPS_H
+#define _PICO_BIT_OPS_H
+
+#include "pico.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \file bit_ops.h
+*  \defgroup pico_bit_ops pico_bit_ops
+*
+* Optimized bit manipulation functions.
+* Additionally provides  replacement implementations of the compiler built-ins __builtin_popcount, __builtin_clz
+* and __bulitin_ctz
+*/
+
+/*! \brief Reverse the bits in a 32 bit word
+ *  \ingroup pico_bit_ops
+ *
+ * \param bits 32 bit input
+ * \return the 32 input bits reversed
+ */
+uint32_t __rev(uint32_t bits);
+
+/*! \brief Reverse the bits in a 64 bit double word
+ *  \ingroup pico_bit_ops
+ *
+ * \param bits 64 bit input
+ * \return the 64 input bits reversed
+ */
+uint64_t __revll(uint64_t bits);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif