mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
046c7ebd4a
- Introduce fast spinlock API - Double rand64() perf w/ spinlock - Improve raise() on New Technology - Support gettid() across platforms - Implement SA_NODEFER on New Technology - Move the lock intrinsics into LIBC_INTRIN - Make SIGTRAP recoverable on New Technology - Block SIGCHLD in wait4() on New Technology - Add threading prototypes for XNU and FreeBSD - Rewrite abort() fixing its minor bugs on XNU/NT - Shave down a lot of the content in libc/bits/bits.h - Let signal handlers modify CPU registers on New Technology
45 lines
2.4 KiB
C
45 lines
2.4 KiB
C
#ifndef COSMOPOLITAN_LIBC_BITS_BITOP_H_
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#define COSMOPOLITAN_LIBC_BITS_BITOP_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#define bts(MEM, BIT) __BitOp("bts", BIT, MEM) /** bit test and set */
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#define btr(MEM, BIT) __BitOp("btr", BIT, MEM) /** bit test and reset */
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#define btc(MEM, BIT) __BitOp("btc", BIT, MEM) /** bit test and complement */
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#define lockbts(MEM, BIT) __BitOp("lock bts", BIT, MEM)
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#define lockbtr(MEM, BIT) __BitOp("lock btr", BIT, MEM)
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#define lockbtc(MEM, BIT) __BitOp("lock btc", BIT, MEM)
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
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#define __BitOp(OP, BIT, MEM) \
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({ \
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bool OldBit; \
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if (__builtin_constant_p(BIT)) { \
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asm(CFLAG_ASM(OP "%z1\t%2,%1") \
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: CFLAG_CONSTRAINT(OldBit), \
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"+m"((MEM)[(BIT) / (sizeof((MEM)[0]) * CHAR_BIT)]) \
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: "J"((BIT) % (sizeof((MEM)[0]) * CHAR_BIT)) \
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: "cc"); \
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} else if (sizeof((MEM)[0]) == 2) { \
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asm(CFLAG_ASM(OP "\t%w2,%1") \
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: CFLAG_CONSTRAINT(OldBit), "+m"((MEM)[0]) \
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: "r"(BIT) \
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: "cc"); \
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} else if (sizeof((MEM)[0]) == 4) { \
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asm(CFLAG_ASM(OP "\t%k2,%1") \
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: CFLAG_CONSTRAINT(OldBit), "+m"((MEM)[0]) \
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: "r"(BIT) \
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: "cc"); \
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} else if (sizeof((MEM)[0]) == 8) { \
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asm(CFLAG_ASM(OP "\t%q2,%1") \
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: CFLAG_CONSTRAINT(OldBit), "+m"((MEM)[0]) \
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: "r"(BIT) \
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: "cc"); \
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} \
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OldBit; \
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})
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#endif /* __GNUC__ && !__STRICT_ANSI__ */
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_BITS_BITOP_H_ */
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