108 lines
2.4 KiB
C
108 lines
2.4 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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static uint64_t ByteSwap64(uint64_t x)
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{
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#ifdef ARCH_X86_64
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__asm("bswap %0" : "=r"(x) : "0"(x));
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return x;
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#else
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register union {
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__extension__ uint64_t __ll;
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uint32_t __l[2];
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} __x;
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asm("xchgl %0,%1"
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: "=r"(__x.__l[0]), "=r"(__x.__l[1])
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: "0"(bswap_32((unsigned long)x)),
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"1"(bswap_32((unsigned long)(x >> 32))));
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return __x.__ll;
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#endif
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}
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#define bswap_64(x) ByteSwap64(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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static uint64_t ByteSwap64(uint64_t x)
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{
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union {
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uint64_t ll;
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uint32_t l[2];
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} w, r;
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w.ll = x;
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r.l[0] = bswap_32(w.l[1]);
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r.l[1] = bswap_32(w.l[0]);
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return r.ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#endif
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