sh-dis/sh4/TST.B #imm,@(R0,GBR)

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r0 ← SignExtend32(R0);
gbr ← SignExtend32(GBR);
imm ← ZeroExtend8(i);
address ← ZeroExtend32(r0 + gbr);
value ← ZeroExtend8(ReadMemory8(address));
t ← ((value ∧ imm) = 0);
T ← Bit(t);