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optimize bswap64 for Big Endian hosts

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This commit is contained in:
Stanislav Shwartsman 2011-04-20 17:30:21 +00:00
parent e56db12304
commit 89d92cc0fe
1 changed files with 3 additions and 9 deletions
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12
bochs/bochs.h
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@ -518,15 +518,9 @@ BX_CPP_INLINE Bit32u bx_bswap32(Bit32u val32)
BX_CPP_INLINE Bit64u bx_bswap64(Bit64u val64)
{
Bit64u b0 = val64 & 0xff; val64 >>= 8;
Bit64u b1 = val64 & 0xff; val64 >>= 8;
Bit64u b2 = val64 & 0xff; val64 >>= 8;
Bit64u b3 = val64 & 0xff; val64 >>= 8;
Bit64u b4 = val64 & 0xff; val64 >>= 8;
Bit64u b5 = val64 & 0xff; val64 >>= 8;
Bit64u b6 = val64 & 0xff; val64 >>= 8;
Bit64u b7 = val64;
return (b0<<56) | (b1<<48) | (b2<<40) | (b3<<32) | (b4<<24) | (b5<<16) | (b6<<8) | b7;
Bit32u lo = bx_bswap32((Bit32u)(val64 >> 32));
Bit32u hi = bx_bswap32((Bit32u)(val64 & 0xFFFFFFFF));
return ((Bit64u)hi << 32) | (Bit64u)lo;
}
// These are some convenience macros which abstract out accesses between