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==== Fetch ==== | ==== Fetch ==== | ||
− | [[Instruction fetch]] is done on a 32-byte window or 8 (4-byte) [[ARM]] instructions | + | [[Instruction fetch]] is done on a 32-byte window or 8 (4-byte) [[ARM]] instructions. The instruction stream is decomposed into its constituent instructions where they are queued to go for the [[instruction decode|decoder]]. The queue is shared by all threads. The size of the queue has not been disclosed. |
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==== Decoding ==== | ==== Decoding ==== | ||
Each cycle, up to four instructions are sent to the [[instruction decode|decoder]]. In prior design, [[Broadcom]]'s products decoded [[MIPS]] instructions. With Vulcan, the switching to ARM meant the decoder had to be replaced with much more complex logic that decodes the original [[instruction]] and emits [[micro-ops]]. For the most part, there is a 1:1 mapping between instructions and µOP with an average of 15% more µOPs emitted from instructions. The extra complexity has added another pipeline stage to the decode. | Each cycle, up to four instructions are sent to the [[instruction decode|decoder]]. In prior design, [[Broadcom]]'s products decoded [[MIPS]] instructions. With Vulcan, the switching to ARM meant the decoder had to be replaced with much more complex logic that decodes the original [[instruction]] and emits [[micro-ops]]. For the most part, there is a 1:1 mapping between instructions and µOP with an average of 15% more µOPs emitted from instructions. The extra complexity has added another pipeline stage to the decode. |
Facts about "Vulcan - Microarchitectures - Cavium"
codename | Vulcan + |
core count | 16 +, 20 +, 24 +, 28 +, 30 + and 32 + |
designer | Cavium + and Broadcom + |
first launched | 2018 + |
full page name | cavium/microarchitectures/vulcan + |
instance of | microarchitecture + |
instruction set architecture | ARMv8.1 + |
manufacturer | TSMC + |
microarchitecture type | CPU + |
name | Vulcan + |
pipeline stages (max) | 15 + |
pipeline stages (min) | 13 + |
process | 16 nm (0.016 μm, 1.6e-5 mm) + |