30 lines
1.0 KiB
C
30 lines
1.0 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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unsigned bsr(unsigned) libcesque pureconst;
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unsigned bsrl(unsigned long) libcesque pureconst;
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unsigned bsrmax(uintmax_t) libcesque pureconst;
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#ifdef __GNUC__
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#define bsr(X) \
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({ \
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unsigned Word; \
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asm("bsrl\t%1,%0" : "=r,r"(Word) : "r,m"(X)); \
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Word; \
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})
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#define bsrl(X) \
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({ \
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unsigned Res; \
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unsigned long Word; \
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asm("bsrq\t%1,%0" : "=r,r"(Word) : "r,m"(X)); \
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Res = Word; \
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Res; \
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})
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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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