diff options
Diffstat (limited to 'ChocolArm64/Decoder/AOpCodeSimdMemSs.cs')
| -rw-r--r-- | ChocolArm64/Decoder/AOpCodeSimdMemSs.cs | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/ChocolArm64/Decoder/AOpCodeSimdMemSs.cs b/ChocolArm64/Decoder/AOpCodeSimdMemSs.cs new file mode 100644 index 00000000..be4a8cd9 --- /dev/null +++ b/ChocolArm64/Decoder/AOpCodeSimdMemSs.cs @@ -0,0 +1,97 @@ +using ChocolArm64.Instruction; +using ChocolArm64.State; + +namespace ChocolArm64.Decoder +{ + class AOpCodeSimdMemSs : AOpCodeMemReg, IAOpCodeSimd + { + public int SElems { get; private set; } + public int Index { get; private set; } + public bool Replicate { get; private set; } + public bool WBack { get; private set; } + + public AOpCodeSimdMemSs(AInst Inst, long Position, int OpCode) : base(Inst, Position, OpCode) + { + int Size = (OpCode >> 10) & 3; + int S = (OpCode >> 12) & 1; + int SElems = (OpCode >> 12) & 2; + int Scale = (OpCode >> 14) & 3; + int L = (OpCode >> 22) & 1; + int Q = (OpCode >> 30) & 1; + + SElems |= (OpCode >> 21) & 1; + + SElems++; + + int Index = (Q << 3) | (S << 2) | Size; + + switch (Scale) + { + case 1: + { + if ((Size & 1) != 0) + { + Inst = AInst.Undefined; + + return; + } + + Index >>= 1; + + break; + } + + case 2: + { + if ((Size & 2) != 0 || + ((Size & 1) != 0 && S != 0)) + { + Inst = AInst.Undefined; + + return; + } + + if ((Size & 1) != 0) + { + Index >>= 3; + + Scale = 3; + } + else + { + Index >>= 2; + } + + break; + } + + case 3: + { + if (L == 0 || S != 0) + { + Inst = AInst.Undefined; + + return; + } + + Scale = Size; + + Replicate = true; + + break; + } + } + + this.SElems = SElems; + this.Size = Scale; + + Extend64 = false; + + WBack = ((OpCode >> 23) & 0x1) != 0; + + RegisterSize = Q != 0 + ? ARegisterSize.SIMD128 + : ARegisterSize.SIMD64; + } + } +}
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