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29 lines
1.2 KiB
C
29 lines
1.2 KiB
C
#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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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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int bsr128(uint128_t) pureconst;
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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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#endif
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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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