Abstract: An RVV1.0 extension-based FFT butterfly operation method for complex sequences includes the following steps: S1, in one stage of an FFT butterfly operation, acquiring data to be processed; S2, based on a standard vector structure of RVV1.0, defining an extended instruction I in a reserved instruction code space of an RISC-V architecture to obtain first data of a multiply-add operation; S3, defining an extended instruction II to obtain second data of the multiply-add operation, and adding the second data and the first data to obtain a multiply-add operation result; S4, defining an extended instruction III to obtain a multiply-subtract operation result; S5, storing a result in a vector register as an operation result of the stage; and S6, if there is a next stage, performing the next stage, and returning to S1; or, if there is not a next stage, ending the FFT butterfly operation.

Abstract: An illegal address mask method for cores of a DSP includes: S1, initializing a core of a DSP; S2, configuring a start address register and an end address register, and taking an address range defined by the start address register and the end address register as a masked address range; configuring a first comparator and a second comparator to send out illegal address decision signals for instructions within the masked address range; S3, acquiring a PC pointer, and determining whether the PC pointer is located in the masked address range; if so, sending out an illegal address decision signal to stop an operation; if not, performing pre-decoding to obtain a memory access instruction; and S4, determining whether an address of the memory access instruction is located in the masked address range; if so, sending out an illegal address decision signal to stop an operation; otherwise, completing a memory access operation.

Abstract: A method for improving an accuracy of a loop branch prediction algorithm by a bypass circuit, comprising: adding a bypass circuit to a loop branch prediction algorithm; and for three pcs entering a pipeline, enabling pc1 fetched in an if0 stage to enter a hybrid branch predictor, and registering pc1; obtaining branch prediction information in an if1 stage, and making a comparison in an if2 stage to obtain a prediction result, registering the prediction result obtained in the if2 stage, and processing pc2 and pc3 in a same way.

Abstract: A method for improving an accuracy of a loop branch prediction algorithm by a bypass circuit, comprising: adding a bypass circuit to a loop branch prediction algorithm; and for three pcs entering a pipeline, enabling pc1 fetched in an if0 stage to enter a hybrid branch predictor, and registering pc1; obtaining branch prediction information in an if1 stage, and making a comparison in an if2 stage to obtain a prediction result, registering the prediction result obtained in the if2 stage, and processing pc2 and pc3 in a same way.

Abstract: A foldable terminal apparatus, a terminal control method, a terminal apparatus, and a non-transitory computer-readable storage medium are provided. The foldable terminal apparatus comprises a terminal body and a bendable touch screen. The bendable touch screen in a bending direction has a fixed end connected to the terminal body and a free end, and the bendable touch screen is switched between a first state and a second state. In the first state, the bendable touch screen surrounds the terminal body on an outer side of the terminal body, and in the second state, the fixed end of the bendable touch screen is located on the terminal body and the free end is located outside the terminal body, such that the bendable touch screen is expanded.

Abstract: A foldable terminal apparatus, a terminal control method, a terminal apparatus, and a non-transitory computer-readable storage medium are provided. The foldable terminal apparatus comprises a terminal body and a bendable touch screen. The bendable touch screen in a bending direction has a fixed end connected to the terminal body and a free end, and the bendable touch screen is switched between a first state and a second state. In the first state, the bendable touch screen surrounds the terminal body on an outer side of the terminal body, and in the second state, the fixed end of the bendable touch screen is located on the terminal body and the free end is located outside the terminal body, such that the bendable touch screen is expanded.