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https://github.com/dolphin-emu/dolphin.git
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MathUtil: fix IsQNAN()
The constants were one nibble too short and the lower 51 bits don't actually have to be zero.
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@ -20,16 +20,18 @@ inline void Clamp(T* val, const T& min, const T& max)
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*val = max;
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}
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// The most significant bit of the fraction is an is-quiet bit on all architectures we care about.
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static const u64 DOUBLE_SIGN = 0x8000000000000000ULL,
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DOUBLE_EXP = 0x7FF0000000000000ULL,
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DOUBLE_FRAC = 0x000FFFFFFFFFFFFFULL,
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DOUBLE_ZERO = 0x0000000000000000ULL;
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DOUBLE_EXP = 0x7FF0000000000000ULL,
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DOUBLE_FRAC = 0x000FFFFFFFFFFFFFULL,
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DOUBLE_ZERO = 0x0000000000000000ULL,
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DOUBLE_QBIT = 0x0008000000000000ULL;
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static const u32 FLOAT_SIGN = 0x80000000,
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FLOAT_EXP = 0x7F800000,
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FLOAT_FRAC = 0x007FFFFF,
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FLOAT_ZERO = 0x00000000;
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FLOAT_EXP = 0x7F800000,
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FLOAT_FRAC = 0x007FFFFF,
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FLOAT_ZERO = 0x00000000;
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union IntDouble {
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double d;
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@ -40,34 +42,41 @@ union IntFloat {
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u32 i;
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};
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inline bool IsINF(double d)
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{
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IntDouble x; x.d = d;
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return (x.i & ~DOUBLE_SIGN) == DOUBLE_EXP;
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}
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inline bool IsNAN(double d)
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{
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IntDouble x; x.d = d;
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return ( ((x.i & DOUBLE_EXP) == DOUBLE_EXP) &&
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((x.i & DOUBLE_FRAC) != DOUBLE_ZERO) );
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return ((x.i & DOUBLE_EXP) == DOUBLE_EXP) &&
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((x.i & DOUBLE_FRAC) != DOUBLE_ZERO);
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}
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inline bool IsQNAN(double d)
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{
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IntDouble x; x.d = d;
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return ( ((x.i & DOUBLE_EXP) == DOUBLE_EXP) &&
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((x.i & 0x0007fffffffffffULL) == 0x000000000000000ULL) &&
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((x.i & 0x000800000000000ULL) == 0x000800000000000ULL) );
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return ((x.i & DOUBLE_EXP) == DOUBLE_EXP) &&
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((x.i & DOUBLE_QBIT) == DOUBLE_QBIT);
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}
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inline bool IsSNAN(double d)
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{
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IntDouble x; x.d = d;
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return( ((x.i & DOUBLE_EXP) == DOUBLE_EXP) &&
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((x.i & DOUBLE_FRAC) != DOUBLE_ZERO) &&
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((x.i & 0x0008000000000000ULL) == DOUBLE_ZERO) );
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return ((x.i & DOUBLE_EXP) == DOUBLE_EXP) &&
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((x.i & DOUBLE_FRAC) != DOUBLE_ZERO) &&
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((x.i & DOUBLE_QBIT) == DOUBLE_ZERO);
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}
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inline float FlushToZero(float f)
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{
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IntFloat x; x.f = f;
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if ((x.i & FLOAT_EXP) == 0)
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{
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x.i &= FLOAT_SIGN; // turn into signed zero
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}
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return x.f;
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}
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@ -75,7 +84,9 @@ inline double FlushToZero(double d)
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{
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IntDouble x; x.d = d;
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if ((x.i & DOUBLE_EXP) == 0)
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{
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x.i &= DOUBLE_SIGN; // turn into signed zero
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}
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return x.d;
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}
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