76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
#if defined(__amd64__) || defined(_M_AMD64)
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#define ARCH_X86_64
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#define __CPU__ 686
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#elif defined(_M_IX86) // msvs, intel, digital mars, watcom
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#if !defined(__386__)
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#error "unsupported target: 16-bit x86"
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#endif
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#define ARCH_X86
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#define __CPU__ (_M_IX86 + 86)
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#elif defined(__i686__) // gnu c
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#define ARCH_X86
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#define __CPU__ 686
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#elif defined(__i586__) // gnu c
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#define ARCH_X86
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#define __CPU__ 586
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#elif defined(__i486__) // gnu c
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#define ARCH_X86
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#define __CPU__ 486
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#elif defined(__i386__) // gnu c
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#define ARCH_X86
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#define __CPU__ 386
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#else
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#error "unknown architecture"
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#endif
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char *uint2str(char *dest, size_t len, uint64_t num, uint32_t base);
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int str2int(char *str, size_t len, int64_t *res, uint32_t base);
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int isdigit_base(char c, int base);
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#ifdef ARCH_X86_64
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#define LEGACY_REGS "=Q"
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#else
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#define LEGACY_REGS "=q"
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#endif
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#if !defined(__INTEL_COMPILER) && (defined(ARCH_X86) || defined(ARCH_X86_64))
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static uint16_t ByteSwap16(uint16_t x)
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{
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__asm("xchgb %b0,%h0" : LEGACY_REGS(x) : "0"(x));
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return x;
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}
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#define bswap_16(x) ByteSwap16(x)
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static uint32_t ByteSwap32(uint32_t x)
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{
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#if __CPU__ > 386
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__asm("bswap %0"
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: "=r"(x)
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:
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#else
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__asm("xchgb %b0,%h0\n"
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" rorl $16,%0\n"
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" xchgb %b0,%h0"
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: LEGACY_REGS(x)
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:
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#endif
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"0"(x));
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return x;
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}
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#define bswap_32(x) ByteSwap32(x)
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#else
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#define bswap_16(x) (((x)&0x00ff) << 8 | ((x)&0xff00) >> 8)
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#ifdef __INTEL_COMPILER
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#define bswap_32(x) _bswap(x)
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#else
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#define bswap_32(x) \
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((((x)&0xff000000) >> 24) | (((x)&0x00ff0000) >> 8) | \
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(((x)&0x0000ff00) << 8) | (((x)&0x000000ff) << 24))
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#endif
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#endif
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