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HiFi 4 Instruction Set Overview
The HiFi 4 DSP is built on the baseline Xtensa RISC architecture, which implements a richset of generic instructions optimized for efficient embedded processing. The power of HiFi 4comes from a comprehensive DSP and audio instruction set. A wide variety of load/storeoperations support multiple addressing modes, with support for 16/24/32-bit scalar andvector data types together with 56/64-bit scalar. Vector data management is supported withselect operations and shifting.Multiply operations include 32x32-bit, 32x16-bit, and 16x16-bit. Multiply operations come infixed-point and integer variants.
They come in high precision and low precision variants.High-precision multiplies utilize a 64-bit accumulator and in some cases an additional 8-bitextended precision accumulator. Since an accumulator can only hold one result, HiFi 4supports dual multiplies where the results of two multiplies are added or subtracted togetherbefore being added into the accumulator. For example, a single operation might compute thefollowing operation where H and L refer to the high bits or low bits respectively of an operand.
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发表于 2023-10-13 08:33:34
