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ASoftFloat: Fix InvSqrtEstimate for negative values (#233)

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Merry 2018-07-08 16:41:46 +01:00 committed by gdkchan
parent 0bec547b9d
commit af1516a146
1 changed files with 13 additions and 7 deletions
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20
ChocolArm64/Instruction/ASoftFloat.cs
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@ -50,14 +50,8 @@ namespace ChocolArm64.Instruction
long x_exp = (long)((x_bits >> 52) & 0x7FF); long x_exp = (long)((x_bits >> 52) & 0x7FF);
ulong scaled = x_bits & ((1ul << 52) - 1); ulong scaled = x_bits & ((1ul << 52) - 1);
if (x_exp == 0x7ff) if (x_exp == 0x7FF && scaled != 0)
{ {
if (scaled == 0)
{
// Infinity -> Zero
return BitConverter.Int64BitsToDouble((long)x_sign);
}
// NaN // NaN
return BitConverter.Int64BitsToDouble((long)(x_bits | 0x0008000000000000)); return BitConverter.Int64BitsToDouble((long)(x_bits | 0x0008000000000000));
} }
@ -79,6 +73,18 @@ namespace ChocolArm64.Instruction
scaled <<= 1; scaled <<= 1;
} }
if (x_sign != 0)
{
// Negative -> NaN
return BitConverter.Int64BitsToDouble((long)0x7ff8000000000000);
}
if (x_exp == 0x7ff && scaled == 0)
{
// Infinity -> Zero
return BitConverter.Int64BitsToDouble((long)x_sign);
}
if (((ulong)x_exp & 1) == 1) if (((ulong)x_exp & 1) == 1)
{ {
scaled >>= 45; scaled >>= 45;