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riscv-isa-manual reviews and mentions
- Need help with designing a basic RISC V processor?
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The legend of “x86 CPUs decode instructions into RISC form internally”
I tried searching the spec [1] for "overflow" and here is what it says at page 17:
> We did not include special instruction-set support for overflow checks on integer arithmetic operations in the base instruction set, as many overflow checks can be cheaply implemented using RISC-V branches.
> For general signed addition, three additional instructions after the addition are required
Is this "cheap", replacing 1 instruction with four? According to some old mainframe era research (cannot find link now), addition is the most often used instruction and they suggest that we should replace each one with four?
Their "rationale" is not rational at all. It doesn't make sense.
Overflow check should be free (no additional instructions required), otherwise we will see the same story we have seen for last 50 years: compiler writers do not want to implement checks because they are expensive; language designers do not want to use proper arithmetic because it is expensive. As a result, there will be errors and vulnerabilities. A vicious circle.
[1] https://github.com/riscv/riscv-isa-manual/releases/download/...
- 64-bit Arm ∩ 64-bit RISC V
- Beginner question: F extension
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Riscv Ghidra Instruction Manual
Why not use the actual release PDF instead from their github? https://github.com/riscv/riscv-isa-manual
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How would I go about designing an 8-bit RISC-V CPU? Is it possible?
https://github.com/riscv/riscv-isa-manual/releases/download/Priv-v1.12/riscv-privileged-20211203.pdf Part 2
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Have to convert a C language code into RISC-V MIPS
If you don't want to cheat then read the RISC-V ISA manual: https://github.com/riscv/riscv-isa-manual/releases/download/Ratified-IMAFDQC/riscv-spec-20191213.pdf
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How does a computer understand machine language?
Yeah you are on the right track. Processors are designed on top of an Instruction Set Architecture (ISA). For an example you can look on top of the RISC-V specifications:https://github.com/riscv/riscv-isa-manual/releases/download/Ratified-IMAFDQC/riscv-spec-20191213.pdf (possible PDF download)
- $0.10 CH32V003 controlling ILI9341 over SPI with DMA at 24 MHz
- Designing a RISC V microprocessor in Verilog as undergrad project
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www.saashub.com | 26 Apr 2024
Stats
riscv/riscv-isa-manual is an open source project licensed under Creative Commons Attribution 4.0 which is not an OSI approved license.
The primary programming language of riscv-isa-manual is TeX.
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