diff options
Diffstat (limited to 'ChocolArm64/Instruction/AInstEmitAluHelper.cs')
| -rw-r--r-- | ChocolArm64/Instruction/AInstEmitAluHelper.cs | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/ChocolArm64/Instruction/AInstEmitAluHelper.cs b/ChocolArm64/Instruction/AInstEmitAluHelper.cs new file mode 100644 index 00000000..e848742d --- /dev/null +++ b/ChocolArm64/Instruction/AInstEmitAluHelper.cs @@ -0,0 +1,168 @@ +using ChocolArm64.Decoder; +using ChocolArm64.State; +using ChocolArm64.Translation; +using System.Reflection.Emit; + +namespace ChocolArm64.Instruction +{ + static class AInstEmitAluHelper + { + public static void EmitAddsCCheck(AILEmitterCtx Context) + { + //C = Rd < Rn + Context.Emit(OpCodes.Dup); + + EmitDataLoadRn(Context); + + Context.Emit(OpCodes.Clt_Un); + + Context.EmitStflg((int)APState.CBit); + } + + public static void EmitAddsVCheck(AILEmitterCtx Context) + { + //V = (Rd ^ Rn) & ~(Rn ^ Rm) < 0 + Context.Emit(OpCodes.Dup); + + EmitDataLoadRn(Context); + + Context.Emit(OpCodes.Xor); + + EmitDataLoadOpers(Context); + + Context.Emit(OpCodes.Xor); + Context.Emit(OpCodes.Not); + Context.Emit(OpCodes.And); + + Context.EmitLdc_I(0); + + Context.Emit(OpCodes.Clt); + + Context.EmitStflg((int)APState.VBit); + } + + public static void EmitSubsCCheck(AILEmitterCtx Context) + { + //C = Rn == Rm || Rn > Rm = !(Rn < Rm) + EmitDataLoadOpers(Context); + + Context.Emit(OpCodes.Clt_Un); + + Context.EmitLdc_I4(1); + + Context.Emit(OpCodes.Xor); + + Context.EmitStflg((int)APState.CBit); + } + + public static void EmitSubsVCheck(AILEmitterCtx Context) + { + //V = (Rd ^ Rn) & (Rn ^ Rm) < 0 + Context.Emit(OpCodes.Dup); + + EmitDataLoadRn(Context); + + Context.Emit(OpCodes.Xor); + + EmitDataLoadOpers(Context); + + Context.Emit(OpCodes.Xor); + Context.Emit(OpCodes.And); + + Context.EmitLdc_I(0); + + Context.Emit(OpCodes.Clt); + + Context.EmitStflg((int)APState.VBit); + } + + public static void EmitDataLoadRm(AILEmitterCtx Context) + { + Context.EmitLdintzr(((IAOpCodeAluRs)Context.CurrOp).Rm); + } + + public static void EmitDataLoadOpers(AILEmitterCtx Context) + { + EmitDataLoadRn(Context); + EmitDataLoadOper2(Context); + } + + public static void EmitDataLoadRn(AILEmitterCtx Context) + { + IAOpCodeAlu Op = (IAOpCodeAlu)Context.CurrOp; + + if (Op.DataOp == ADataOp.Logical || Op is IAOpCodeAluRs) + { + Context.EmitLdintzr(Op.Rn); + } + else + { + Context.EmitLdint(Op.Rn); + } + } + + public static void EmitDataLoadOper2(AILEmitterCtx Context) + { + switch (Context.CurrOp) + { + case IAOpCodeAluImm Op: + Context.EmitLdc_I(Op.Imm); + break; + + case IAOpCodeAluRs Op: + Context.EmitLdintzr(Op.Rm); + + switch (Op.ShiftType) + { + case AShiftType.Lsl: Context.EmitLsl(Op.Shift); break; + case AShiftType.Lsr: Context.EmitLsr(Op.Shift); break; + case AShiftType.Asr: Context.EmitAsr(Op.Shift); break; + case AShiftType.Ror: Context.EmitRor(Op.Shift); break; + } + break; + + case IAOpCodeAluRx Op: + Context.EmitLdintzr(Op.Rm); + Context.EmitCast(Op.IntType); + Context.EmitLsl(Op.Shift); + break; + } + } + + public static void EmitDataStore(AILEmitterCtx Context) => EmitDataStore(Context, false); + public static void EmitDataStoreS(AILEmitterCtx Context) => EmitDataStore(Context, true); + + public static void EmitDataStore(AILEmitterCtx Context, bool SetFlags) + { + IAOpCodeAlu Op = (IAOpCodeAlu)Context.CurrOp; + + if (SetFlags || Op is IAOpCodeAluRs) + { + Context.EmitStintzr(Op.Rd); + } + else + { + Context.EmitStint(Op.Rd); + } + } + + public static void EmitSetNZCV(AILEmitterCtx Context, int NZCV) + { + Context.EmitLdc_I4((NZCV >> 0) & 1); + + Context.EmitStflg((int)APState.VBit); + + Context.EmitLdc_I4((NZCV >> 1) & 1); + + Context.EmitStflg((int)APState.CBit); + + Context.EmitLdc_I4((NZCV >> 2) & 1); + + Context.EmitStflg((int)APState.ZBit); + + Context.EmitLdc_I4((NZCV >> 3) & 1); + + Context.EmitStflg((int)APState.NBit); + } + } +}
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