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==== Front End ==== | ==== Front End ==== | ||
[[File:amd zen hc28 fetch.png|300px|right]] | [[File:amd zen hc28 fetch.png|300px|right]] | ||
− | The Front End of the Zen core deals with the [[in-order]] operations such as [[instruction fetch]] and [[instruction decode]]. The instruction fetch is composed of two paths: a traditional decode path where instructions come from the [[instruction cache]] and a [[µOPs cache]] that are determined by the [[branch prediction]] (BP) unit. The instruction stream and the branch prediction unit track instructions in 64B windows | + | The Front End of the Zen core deals with the [[in-order]] operations such as [[instruction fetch]] and [[instruction decode]]. The instruction fetch is composed of two paths: a traditional decode path where instructions come from the [[instruction cache]] and a [[µOPs cache]] that are determined by the [[branch prediction]] (BP) unit. The instruction stream and the branch prediction unit track instructions in 64B windows. |
The [[branch prediction]] unit is decoupled and can start working as soon as it receives a desired operation such as a redirect, ahead of traditional instruction fetches. AMD still uses a [[perceptron branch predictor|hashed perceptron system]] similar to the one used in {{\\|Jaguar}} and {{\\|Bobcat}}, albeit likely much more finely tuned. AMD stated it's also larger than previous architectures but did not disclose actual sizes. Once the BP detects an indirect target operation, the branch is moved to the Indirect Target Array (ITA) which is 512 entry deep. The BP includes a 32-entry return stack. | The [[branch prediction]] unit is decoupled and can start working as soon as it receives a desired operation such as a redirect, ahead of traditional instruction fetches. AMD still uses a [[perceptron branch predictor|hashed perceptron system]] similar to the one used in {{\\|Jaguar}} and {{\\|Bobcat}}, albeit likely much more finely tuned. AMD stated it's also larger than previous architectures but did not disclose actual sizes. Once the BP detects an indirect target operation, the branch is moved to the Indirect Target Array (ITA) which is 512 entry deep. The BP includes a 32-entry return stack. |
Facts about "Zen - Microarchitectures - AMD"
codename | Zen + |
core count | 4 +, 6 +, 8 +, 16 +, 24 +, 32 + and 12 + |
designer | AMD + |
first launched | March 2, 2017 + |
full page name | amd/microarchitectures/zen + |
instance of | microarchitecture + |
instruction set architecture | x86-64 + |
manufacturer | GlobalFoundries + |
microarchitecture type | CPU + |
name | Zen + |
pipeline stages | 19 + |
process | 14 nm (0.014 μm, 1.4e-5 mm) + |