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Diffstat (limited to 'ChocolArm64/Decoders/DecoderHelper.cs')
-rw-r--r-- | ChocolArm64/Decoders/DecoderHelper.cs | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/ChocolArm64/Decoders/DecoderHelper.cs b/ChocolArm64/Decoders/DecoderHelper.cs deleted file mode 100644 index 2209472b..00000000 --- a/ChocolArm64/Decoders/DecoderHelper.cs +++ /dev/null @@ -1,112 +0,0 @@ -using System; - -namespace ChocolArm64.Decoders -{ - static class DecoderHelper - { - public struct BitMask - { - public long WMask; - public long TMask; - public int Pos; - public int Shift; - public bool IsUndefined; - - public static BitMask Invalid => new BitMask { IsUndefined = true }; - } - - public static BitMask DecodeBitMask(int opCode, bool immediate) - { - int immS = (opCode >> 10) & 0x3f; - int immR = (opCode >> 16) & 0x3f; - - int n = (opCode >> 22) & 1; - int sf = (opCode >> 31) & 1; - - int length = BitUtils.HighestBitSet32((~immS & 0x3f) | (n << 6)); - - if (length < 1 || (sf == 0 && n != 0)) - { - return BitMask.Invalid; - } - - int size = 1 << length; - - int levels = size - 1; - - int s = immS & levels; - int r = immR & levels; - - if (immediate && s == levels) - { - return BitMask.Invalid; - } - - long wMask = BitUtils.FillWithOnes(s + 1); - long tMask = BitUtils.FillWithOnes(((s - r) & levels) + 1); - - if (r > 0) - { - wMask = BitUtils.RotateRight(wMask, r, size); - wMask &= BitUtils.FillWithOnes(size); - } - - return new BitMask() - { - WMask = BitUtils.Replicate(wMask, size), - TMask = BitUtils.Replicate(tMask, size), - - Pos = immS, - Shift = immR - }; - } - - public static long DecodeImm8Float(long imm, int size) - { - int e = 0, f = 0; - - switch (size) - { - case 0: e = 8; f = 23; break; - case 1: e = 11; f = 52; break; - - default: throw new ArgumentOutOfRangeException(nameof(size)); - } - - long value = (imm & 0x3f) << f - 4; - - long eBit = (imm >> 6) & 1; - long sBit = (imm >> 7) & 1; - - if (eBit != 0) - { - value |= (1L << e - 3) - 1 << f + 2; - } - - value |= (eBit ^ 1) << f + e - 1; - value |= sBit << f + e; - - return value; - } - - public static long DecodeImm24_2(int opCode) - { - return ((long)opCode << 40) >> 38; - } - - public static long DecodeImm26_2(int opCode) - { - return ((long)opCode << 38) >> 36; - } - - public static long DecodeImmS19_2(int opCode) - { - return (((long)opCode << 40) >> 43) & ~3; - } - - public static long DecodeImmS14_2(int opCode) - { - return (((long)opCode << 45) >> 48) & ~3; - } - } -}
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