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ASoftFloat: Fix InvSqrtEstimate for negative values (#233)
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commit
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1 changed files with 13 additions and 7 deletions
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@ -50,14 +50,8 @@ namespace ChocolArm64.Instruction
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long x_exp = (long)((x_bits >> 52) & 0x7FF);
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long x_exp = (long)((x_bits >> 52) & 0x7FF);
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ulong scaled = x_bits & ((1ul << 52) - 1);
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ulong scaled = x_bits & ((1ul << 52) - 1);
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if (x_exp == 0x7ff)
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if (x_exp == 0x7FF && scaled != 0)
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{
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{
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if (scaled == 0)
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{
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// Infinity -> Zero
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return BitConverter.Int64BitsToDouble((long)x_sign);
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}
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// NaN
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// NaN
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return BitConverter.Int64BitsToDouble((long)(x_bits | 0x0008000000000000));
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return BitConverter.Int64BitsToDouble((long)(x_bits | 0x0008000000000000));
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}
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}
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@ -79,6 +73,18 @@ namespace ChocolArm64.Instruction
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scaled <<= 1;
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scaled <<= 1;
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}
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}
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if (x_sign != 0)
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{
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// Negative -> NaN
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return BitConverter.Int64BitsToDouble((long)0x7ff8000000000000);
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}
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if (x_exp == 0x7ff && scaled == 0)
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{
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// Infinity -> Zero
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return BitConverter.Int64BitsToDouble((long)x_sign);
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}
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if (((ulong)x_exp & 1) == 1)
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if (((ulong)x_exp & 1) == 1)
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{
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{
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scaled >>= 45;
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scaled >>= 45;
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