2017年5月31日 · (Unlike AArch64 or x86, which only have ALU-select type instructions like csinc vs. cmov / setcc that just have a normal data dependency on FLAGS as well as their other inputs.) ARM and AArch64 (especially SIMD shuffles) have several instructions that produce 2 outputs, while almost all x86 instructions only write one output register.

2013年2月10日 · Arm instructions are architecturally single cycle (except load/store multiple). Arm instructions often do more than one thing (in a single cycle). Where more that one Arm instruction is needed, such as the x86's looping store & auto-increment, the Arm still does it in less clock cycles. Arm has more conditional instructions.

On the other side, the ARM can't do much with memory directly except load from and store to it. Intel assembly can perform more operations directly on memory. Note that the ARM architecture version doesn't correspond directly to the actual ARM processor versions - for example, if I remember right the ARM7 is a architecture v5 processor.

2022年7月13日 · By doing some researches I realized that ARM and RISC are used pretty much interchangably and the same goes for x86 and CISC. I understand that RISC and CISC are the architectures. My understanding is that the architecture (i.e. RISC or CISC) is kind of a set of instructions that the process has to be able to do in order to be one of those ...

2015年7月12日 · If the ARM CPU is synthesized for a tablet/laptop based design, then the memory BUS might be wider/better and comparable to a PC and hence my close vote; not a good question for SO. An ARM can be found in MANY different types of designs. Benchmark an embedded PC104 x86 board to a cell phone is closer (but still not the same).

2016年8月1日 · @ToolmakerSteve actually the choice matters because the x86 based emulator images run faster than the arm based ones on Intel PCs. It’s also true that switching to a qemu based emulator made a big difference in performances of the emulator.

2014年6月9日 · There are key portability differences between an ARM and an x86. They are a sub-set of completely portable code. That is a plus for a virtual machine or interpreter like Python.

2019年6月30日 · To be clear, these are not instruction sets. They are ABIs, which compile into instruction sets. Most devices today are arm64-v8a, the really cheap devices are armeabi-v7a to save cost, and almost none are x86 or x86_64. e.g. The armeabi-v7a ABI compiles to armeabi, thumb-2 and VFPv3-D16 instruction set, but arm64-v8a ABI compiles to AArch64 ...

2018年2月8日 · @Justin 64-bit was introduced in ARM v8, so armv7l means 32-bit little-endian ARM. That being said, if you're on an RPi3: the processor is actually 64-bit, but if your OS is in 32-bit mode it reports an older model. –

2015年6月4日 · In this case x86 is faster/lighter/easier as a smaller address space is need to emulate x86 than x86_64 (eg. 64bit registry vs 32bit registry). – andho Commented Sep 8, 2019 at 18:35