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Questions - riscv

Can CPU Out-of-Order-Execution cause memory reordering?

I know store buffer and invalidate queues are reasons that cause memory reordering. What I don't know is if Out-of-Order-Execution can cause memory reordering. In my opinion, Out-of-Order-Execution ca...
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haolee

cpu

cpu-architecture

cpu-cache

riscv

memory-barriers

Votes: 0

Answers: 1

Latest Answer

Yes, out of order execution can definitely cause memory reordering, such as load/load re-ordering It is not so much a question of the loads being retired in order, as of when the load value is bound t...
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Krazy Glew

Behaviour of RISC-V mulh assembly instruction

The RISC-V reader states that mulh rd, rs1, rs2 "multiplies x[rs1] by x[rs2], treating the values as two'cplement numbers, and writes the upper half of the product to x[rd]" So I am trying t...
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adrianmcmenamin

assembly

64-bit

multiplication

riscv

instruction-set

Votes: 0

Answers: 1

Latest Answer

The 128-bit answer to 2 x 0x7FFFFFFFFFFFFFFF is 0x0000000000000000FFFFFFFFFFFFFFE |------ t0 ----||----- t1 ----| | | +-- the sign bit is the uppermost bit of this hex digit Because you're mu...
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Erik Eidt

Stack usage and string output limit in serial communication in RISC-V (using FreedomStudio)

I am developing using SiFive's FreedomStudio (based eclipse IDE) on HiFive1 Rev B equipment. There is a problem while using serial communication. Depending on the size of the array in the main functio...
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YoungBeom Kim

c

serial-port

embedded

riscv

Votes: 0

Answers: 0

What if RISC-V function has too many arguments?

Register ABI Name Description Saver x10–11 a0–1 Function arguments/return values Caller x12–17 a2–7 Function arguments Caller What if I have ten arguments, where is the place for values ...
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radong

parameter-passing

calling-convention

riscv

abi

Votes: 0

Answers: 1

Latest Answer

The remaining arguments that don't fit in registers will be passed on stack, just like any other calling conventions. Where else can they be? See the ABI: Scalars that are at most XLEN bits wide are ...
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phuclv

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