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libutils: add kernel word size related CTZ macro #176

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libutils: add kernel word size related CTZ macro #176

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16 changes: 16 additions & 0 deletions libutils/include/utils/builtin.h
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@
#define CLZ(x) __builtin_clz(x)
#define CTZL(x) __builtin_ctzl(x)
#define CLZL(x) __builtin_clzl(x)
#define CTZLL(x) __builtin_ctzll(x)
#define CLZLL(x) __builtin_clzll(x)
#define FFS(x) __builtin_ffs(x)
#define FFSL(x) __builtin_ffsl(x)
#define OFFSETOF(type, member) __builtin_offsetof(type, member)
Expand All @@ -25,8 +27,22 @@

#if CONFIG_WORD_SIZE == 32
#define BSWAP_WORD(x) __builtin_bswap32(x)
compile_time_assert(long_is_32bits, sizeof(long) == 4)
#define CTZ_WORD(x) CTZL(x)
#define CLZ_WORD(x) CLZL(x)

#elif CONFIG_WORD_SIZE == 64
#define BSWAP_WORD(x) __builtin_bswap64(x)
compile_time_assert(long_long_is_64bits, sizeof(long long) == 8)
#define CTZ_WORD(x) CTZLL(x)
#define CLZ_WORD(x) CLZLL(x)

#else
/*
* This library aims to be agnostic of the "word" concept, so don't raise an
* error if CONFIG_WORD_SIZE is unsupported or not set. We just don't provide
* the macros at all in this case.
*/
#endif

/* The UNREACHABLE macro is used in some code that is imported to Isabelle via
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