• Division by non-power-of-2 hits into exception
    Hi there, I was using Codewarrior targeting Cortex-R4 CPU to build Firmware. When doing a division coprocessor was used and caused exception. Here is the division in C: u8 i, j = 8; i = j / 3; Disassembly...
  • Cortex-R4: Need a explanation for dual-issue restriction
    Hello, The following table is extracted from the Cortex-R4 whitepaper: Could someone help me to explain that question: My concern is that Cortex-R4 can take MOV as first instruction, ADD as second instruction...
  • IOC flag at FPSCR register
    I using Cortex-R4. And I reading "Cortex™-R4 and Cortex-R4F Technical Reference Manual(Revision:r1p3)". In my system,  IOC flag in FPSCR register is set with unexpected processing. What is the condition...
  • Cortex R4 versus ARM9E
    I have ARM9E very well optimized code. If I run the same piece of code, how much of optimization/performance improvement can be seen on Cortex R4? Does anybody has benchmarking results between ARM9E and...
  • What's the difference between ETM and Debug?
    In the ARM core such as cortex-R4, it has ETM and Debug so I want ask What's the difference between ETM and Debug?