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8c85bdf2ed
* cpu-misc_opt * B = ~b * ;
152 lines
No EOL
4.4 KiB
C#
152 lines
No EOL
4.4 KiB
C#
using ARMeilleure.Common;
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namespace ARMeilleure.Decoders
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{
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static class DecoderHelper
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{
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static DecoderHelper()
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{
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Imm8ToFP32Table = BuildImm8ToFP32Table();
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Imm8ToFP64Table = BuildImm8ToFP64Table();
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}
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public static readonly uint[] Imm8ToFP32Table;
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public static readonly ulong[] Imm8ToFP64Table;
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private static uint[] BuildImm8ToFP32Table()
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{
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uint[] tbl = new uint[256];
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for (int idx = 0; idx < 256; idx++)
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{
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tbl[idx] = ExpandImm8ToFP32((uint)idx);
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}
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return tbl;
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}
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private static ulong[] BuildImm8ToFP64Table()
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{
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ulong[] tbl = new ulong[256];
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for (int idx = 0; idx < 256; idx++)
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{
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tbl[idx] = ExpandImm8ToFP64((ulong)idx);
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}
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return tbl;
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}
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// abcdefgh -> aBbbbbbc defgh000 00000000 00000000 (B = ~b)
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private static uint ExpandImm8ToFP32(uint imm)
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{
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uint MoveBit(uint bits, int from, int to)
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{
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return ((bits >> from) & 1U) << to;
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}
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return MoveBit(imm, 7, 31) | MoveBit(~imm, 6, 30) |
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MoveBit(imm, 6, 29) | MoveBit( imm, 6, 28) |
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MoveBit(imm, 6, 27) | MoveBit( imm, 6, 26) |
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MoveBit(imm, 6, 25) | MoveBit( imm, 5, 24) |
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MoveBit(imm, 4, 23) | MoveBit( imm, 3, 22) |
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MoveBit(imm, 2, 21) | MoveBit( imm, 1, 20) |
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MoveBit(imm, 0, 19);
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}
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// abcdefgh -> aBbbbbbb bbcdefgh 00000000 00000000 00000000 00000000 00000000 00000000 (B = ~b)
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private static ulong ExpandImm8ToFP64(ulong imm)
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{
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ulong MoveBit(ulong bits, int from, int to)
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{
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return ((bits >> from) & 1UL) << to;
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}
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return MoveBit(imm, 7, 63) | MoveBit(~imm, 6, 62) |
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MoveBit(imm, 6, 61) | MoveBit( imm, 6, 60) |
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MoveBit(imm, 6, 59) | MoveBit( imm, 6, 58) |
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MoveBit(imm, 6, 57) | MoveBit( imm, 6, 56) |
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MoveBit(imm, 6, 55) | MoveBit( imm, 6, 54) |
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MoveBit(imm, 5, 53) | MoveBit( imm, 4, 52) |
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MoveBit(imm, 3, 51) | MoveBit( imm, 2, 50) |
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MoveBit(imm, 1, 49) | MoveBit( imm, 0, 48);
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}
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public struct BitMask
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{
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public long WMask;
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public long TMask;
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public int Pos;
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public int Shift;
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public bool IsUndefined;
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public static BitMask Invalid => new BitMask { IsUndefined = true };
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}
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public static BitMask DecodeBitMask(int opCode, bool immediate)
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{
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int immS = (opCode >> 10) & 0x3f;
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int immR = (opCode >> 16) & 0x3f;
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int n = (opCode >> 22) & 1;
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int sf = (opCode >> 31) & 1;
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int length = BitUtils.HighestBitSet((~immS & 0x3f) | (n << 6));
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if (length < 1 || (sf == 0 && n != 0))
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{
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return BitMask.Invalid;
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}
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int size = 1 << length;
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int levels = size - 1;
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int s = immS & levels;
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int r = immR & levels;
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if (immediate && s == levels)
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{
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return BitMask.Invalid;
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}
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long wMask = BitUtils.FillWithOnes(s + 1);
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long tMask = BitUtils.FillWithOnes(((s - r) & levels) + 1);
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if (r > 0)
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{
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wMask = BitUtils.RotateRight(wMask, r, size);
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wMask &= BitUtils.FillWithOnes(size);
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}
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return new BitMask()
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{
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WMask = BitUtils.Replicate(wMask, size),
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TMask = BitUtils.Replicate(tMask, size),
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Pos = immS,
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Shift = immR
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};
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}
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public static long DecodeImm24_2(int opCode)
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{
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return ((long)opCode << 40) >> 38;
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}
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public static long DecodeImm26_2(int opCode)
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{
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return ((long)opCode << 38) >> 36;
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}
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public static long DecodeImmS19_2(int opCode)
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{
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return (((long)opCode << 40) >> 43) & ~3;
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}
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public static long DecodeImmS14_2(int opCode)
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{
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return (((long)opCode << 45) >> 48) & ~3;
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}
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}
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} |