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twinaphex 2015-07-25 01:18:05 +02:00
parent 52b12ae63e
commit a1ad863aac
1 changed files with 0 additions and 19 deletions
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19
mednafen/math_ops.h
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@ -18,25 +18,6 @@ static INLINE uint32 round_up_pow2(uint32 v)
return(v);
}
static INLINE uint32 uilog2(uint32 v)
{
// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogDeBruijn
static const uint32 MultiplyDeBruijnBitPosition[32] =
{
0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31
};
v |= v >> 1; // first round down to one less than a power of 2
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
return MultiplyDeBruijnBitPosition[(uint32_t)(v * 0x07C4ACDDU) >> 27];
}
// Some compilers' optimizers and some platforms might fubar the generated code from these macros,
// so some tests are run in...tests.cpp
#define sign_8_to_s16(_value) ((int16)(int8)(_value))