2020-06-15 14:18:57 +00:00
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#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_
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#define COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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2021-08-10 20:38:27 +00:00
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int bsr(int) pureconst;
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int bsrl(long) pureconst;
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int bsrll(long long) pureconst;
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Import C++ Standard Template Library
You can now use the hardest fastest and most dangerous language there is
with Cosmopolitan. So far about 75% of LLVM libcxx has been added. A few
breaking changes needed to be made to help this go smoothly.
- Rename nothrow to dontthrow
- Rename nodiscard to dontdiscard
- Add some libm functions, e.g. lgamma, nan, etc.
- Change intmax_t from int128 to int64 like everything else
- Introduce %jjd formatting directive for int128_t
- Introduce strtoi128(), strtou128(), etc.
- Rename bsrmax() to bsr128()
Some of the templates that should be working currently are std::vector,
std::string, std::map, std::set, std::deque, etc.
2022-03-22 12:51:41 +00:00
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int bsr128(uint128_t) pureconst;
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2020-08-25 11:23:25 +00:00
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2021-06-15 13:24:46 +00:00
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#if defined(__GNUC__) && defined(__x86_64__) && !defined(__STRICT_ANSI__)
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#define bsr(u) \
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({ \
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unsigned BiTs; \
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asm("bsr\t%0,%0" : "=r"(BiTs) : "0"((unsigned)(u)) : "cc"); \
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BiTs; \
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})
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#define bsrl(u) \
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({ \
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unsigned long BiTs; \
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asm("bsr\t%0,%0" : "=r"(BiTs) : "0"((unsigned long)(u)) : "cc"); \
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(unsigned)BiTs; \
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})
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#define bsrll(u) bsrl(u)
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2020-12-05 20:20:41 +00:00
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#endif
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2020-06-15 14:18:57 +00:00
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_ */
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