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==== Fetch & pre-decoding ==== | ==== Fetch & pre-decoding ==== | ||
− | With the help of the [[branch predictor]], the instructions should already be found in the [[level 1 instruction cache]]. The L1I cache is 64 KiB, 4-way [[set associative]]. Samsung kept the L1I cache the same as prior generations. The L1I cache and has its own [[iTLB]] consisting of 512 entries, double the prior generation. A large change in the M3 is the instruction fetch bandwidth. Previously, up to 24 bytes could be read each cycle into the [[instruction queue]]. In the M3, now 48 bytes (up to 12 [[ARM]] instructions) are read each cycle into the [[instruction queue]] which allows them to hide very short [[branch bubbles]] and deliver a large number of instructions to be decoded by a larger decoder | + | With the help of the [[branch predictor]], the instructions should already be found in the [[level 1 instruction cache]]. The L1I cache is 64 KiB, 4-way [[set associative]]. Samsung kept the L1I cache the same as prior generations. The L1I cache and has its own [[iTLB]] consisting of 512 entries, double the prior generation. A large change in the M3 is the instruction fetch bandwidth. Previously, up to 24 bytes could be read each cycle into the [[instruction queue]]. In the M3, now 48 bytes (up to 12 [[ARM]] instructions) are read each cycle into the [[instruction queue]] which allows them to hide very short [[branch bubbles]] and deliver a large number of instructions to be decoded by a larger decoder. The [[instruction queue]] is a slightly more complex component than a simple buffer. The byte stream gets split up into the [[ARM]] instructions its made off, including dealing with the various misaligned ARM instructions such as in the case of {{arm|thumb|thumb mode}}. If the queue is filled to capacity, the fetch is gated for a cycle in order to allow the queue to naturally decrease. |
===== Branch Predictor ===== | ===== Branch Predictor ===== |
Facts about "Exynos M3 - Microarchitectures - Samsung"
codename | Meerkat + |
core count | 4 + |
designer | Samsung + |
first launched | 2018 + |
full page name | samsung/microarchitectures/m3 + |
instance of | microarchitecture + |
instruction set architecture | ARMv8 + |
manufacturer | Samsung + |
microarchitecture type | CPU + |
name | Meerkat + |
pipeline stages | 16 + |
process | 10 nm (0.01 μm, 1.0e-5 mm) + |