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cffb2d61a7
This simplifies a bunch of code and improves compile performance by about 30%, at the cost of a bit more memory.
24 lines
670 B
C++
24 lines
670 B
C++
#pragma once
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#include "Common/CommonTypes.h"
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class MIPSState;
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struct IRInst;
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inline static u32 ReverseBits32(u32 v) {
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// http://graphics.stanford.edu/~seander/bithacks.html#ReverseParallel
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// swap odd and even bits
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v = ((v >> 1) & 0x55555555) | ((v & 0x55555555) << 1);
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// swap consecutive pairs
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v = ((v >> 2) & 0x33333333) | ((v & 0x33333333) << 2);
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// swap nibbles ...
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v = ((v >> 4) & 0x0F0F0F0F) | ((v & 0x0F0F0F0F) << 4);
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// swap bytes
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v = ((v >> 8) & 0x00FF00FF) | ((v & 0x00FF00FF) << 8);
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// swap 2-byte long pairs
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v = ( v >> 16 ) | ( v << 16);
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return v;
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}
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u32 IRInterpret(MIPSState *mips, const IRInst *inst, int count);
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