diff options
| author | gdkchan <gab.dark.100@gmail.com> | 2022-08-25 06:59:34 -0300 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-08-25 09:59:34 +0000 |
| commit | eba682b767a60db51ff624ae48a3ca0124634705 (patch) | |
| tree | 7b78dff774d67a41bb51bd42f661b7556a5d6b40 /ARMeilleure/Decoders/OpCodeT32MemMult.cs | |
| parent | b994dafe7aa8c49fe8de69b7b81401aaeeed8c59 (diff) | |
Implement some 32-bit Thumb instructions (#3614)1.1.229
* Implement some 32-bit Thumb instructions
* Optimize OpCode32MemMult using PopCount
Diffstat (limited to 'ARMeilleure/Decoders/OpCodeT32MemMult.cs')
| -rw-r--r-- | ARMeilleure/Decoders/OpCodeT32MemMult.cs | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/ARMeilleure/Decoders/OpCodeT32MemMult.cs b/ARMeilleure/Decoders/OpCodeT32MemMult.cs new file mode 100644 index 00000000..a9ba306d --- /dev/null +++ b/ARMeilleure/Decoders/OpCodeT32MemMult.cs @@ -0,0 +1,52 @@ +using System.Numerics; + +namespace ARMeilleure.Decoders +{ + class OpCodeT32MemMult : OpCodeT32, IOpCode32MemMult + { + public int Rn { get; } + + public int RegisterMask { get; } + public int Offset { get; } + public int PostOffset { get; } + + public bool IsLoad { get; } + + public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCodeT32MemMult(inst, address, opCode); + + public OpCodeT32MemMult(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode) + { + Rn = (opCode >> 16) & 0xf; + + bool isLoad = (opCode & (1 << 20)) != 0; + bool w = (opCode & (1 << 21)) != 0; + bool u = (opCode & (1 << 23)) != 0; + bool p = (opCode & (1 << 24)) != 0; + + RegisterMask = opCode & 0xffff; + + int regsSize = BitOperations.PopCount((uint)RegisterMask) * 4; + + if (!u) + { + Offset -= regsSize; + } + + if (u == p) + { + Offset += 4; + } + + if (w) + { + PostOffset = u ? regsSize : -regsSize; + } + else + { + PostOffset = 0; + } + + IsLoad = isLoad; + } + } +}
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