Thumb data processing instructions

 

 

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59. ? The data processing instructions manipulate data within registers. They include move instructions, arithmetic instructions, shifts, logical instructions, comparison instructions, and The Thumb data processing instructions are a subset of the ARM data processing instructions. Chapter 4. Introduction to the Thumb Instruction Set. Chapter 5. Efficient C Programming. Chapter 6. Writing and Optimizing ARM Assembly Code. 3.1 Data Processing Instructions 3.2 Branch Instructions 3.3 Load-Store Instructions 3.4 Software Interrupt Instruction 3.5 Program Status The main instruction set categories are: • branch instructions • data processing instructions • status register transfer instructions • load and store instructions • coprocessor instructions. • exception-generating instructions. Note Only load, store Thumb data processing instructions that access registers r8 to r15 cannot update the flags. All data processing instructions update the ALU status flags in the CPSR, except when one or more high registers are used in MOV and ADD instructions. S = For data processing instructions, signifies that the instruction updates condition codes S = For load/store multiple, signifies whether execution is restricted to Thumb Instruction Set Differences. • All instructions are unconditional (so cc field is unused - saving 4 bits). • All arithmetic and logical ARM data-processing instructions operate on data and produce new value. Arithmetic instructions are very basic and frequently used in your ARM programming. THUMB ; Vector Table Mapped to Address 0 at Reset ; Linker requires __Vectors to be exported. Thumb instructions are 16-bits wide and give maximum code-density. Instructions operate on 8-, 16-, and 32-bit data types. When processing 32-bit data, a 16-bit architecture will take at least two instructions to perform the same task as a single ARM instruction. § Data Processing Instructions § DSP and Media instructions § Load and Store instructions § Branch instructions § System control - BXJ, RFE, SRS Thumb-2 Bit Field Instructions. Allow insertion and extraction of signed/unsigned bit fields. § Provides better handling of packed structures Most data processing instructions update the condition flags in the Application Program Status Register (APSR) according to the result of the operation, see Application Program Status Register on page 15. Some instructions update all flags, and some only update a subset. If a flag is not updated General Data-Processing Instructions. Multiply and Divide Instructions. The Thumb instruction set provides only a subset of the ARM instructions, but it can provide higher code density. Table 4.6 32-Bit Data Processing Instructions. Instruction. Most data-processing instructions and one type of coprocessor instruction can update the four condition code flags in the CPSR (Negative, Zero, Carry and oVerflow) according to their result. Data-processing instructions These start a coprocessor-specific internal operation. This optional extension adds the ARM Digital Signal Processing (DSP) instructions to the ARMv7-M Thumb instruction set. The FP extension provides single-precision floating point data-processing instructions, that operate on registers S0-S31. This optional extension adds the ARM Digital Signal Processing (DSP) instructions to the ARMv7-M Thumb instruction set. The FP extension provides single-precision floating point data-processing instructions, that operate on registers S0-S31. Data processing is, generally, "the collection and manipulation of items of data to produce meaningful information." In this sense it can be considered a subset of information processing, "the change (processing) of information in any manner detectable by an observer.".

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