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** Floating-point execution units reorganized
 
** Floating-point execution units reorganized
 
{{expand list}}
 
{{expand list}}
 +
 +
=== Block Diagram ===
 +
==== Individual Core ====
 +
[[File:m4 block diagram.svg|900px]]
 +
 +
=== Memory Hierarchy ===
 +
* Cache
 +
** L1I Cache
 +
*** 64 KiB, 4-way set associative
 +
**** 128 B line size
 +
**** per core
 +
*** Parity-protected
 +
** L1D Cache
 +
*** 64 KiB, 8-way set associative
 +
**** 64 B line size
 +
**** per core
 +
*** 4 cycles for fastest load-to-use
 +
*** 32 B/cycle load bandwidth
 +
*** 16 B/cycle store bandwidth
 +
** L2 Cache
 +
*** 512 KiB, 8-way set associative
 +
*** Inclusive of L1
 +
*** 12 cycles latency
 +
*** 32 B/cycle bandwidth
 +
** L3 Cache
 +
*** 4 MiB, 16-way set associative
 +
**** 1 MiB slice/core
 +
*** Exlusive of L2
 +
*** ~37-cycle typical (NUCA)
 +
** BIU
 +
*** 80 outstanding transactions
 +
 +
Mongoose 1 TLB consists of dedicated L1 TLB for instruction cache (ITLB) and another one for data cache (DTLB). Additionally, there is a unified L2 TLB (STLB).
 +
 +
* TLBs
 +
** ITLB
 +
*** 512-entry
 +
** DTLB
 +
*** 32-entry
 +
*** 512-entry Mid-level DTLB
 +
** STLB
 +
*** 4,096-entry
 +
*** Per core
 +
 +
* BPU
 +
** 4K-entry main BTB
 +
** 128-entry µBTB
 +
** 64-entry return stack
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** 16K-entry L2 BTB
 +
 +
== Core ==
 +
The core of the M4 is largely the same as {{\\|M3}}.
 +
 +
=== Execution engine ===
 +
==== Floating-point cluster ====
 +
{{empty section}}
 +
==== Memory subsystem ====
 +
{{empty section}}

Revision as of 22:39, 13 January 2019

Edit Values
Mongoose 4 µarch
General Info
Arch TypeCPU
DesignerSamsung
ManufacturerSamsung
Introduction2018
Process8 nm
Instructions
ISAARMv8
Succession

Exynos Mongoose 4 (M4) is the successor to the Mongoose 3, an 8 nm ARM microarchitecture designed by Samsung for their consumer electronics.

Process Technology

The M4 is fabricated on Samsung's 8 nm process (8LPP).

Compiler support

Compiler Arch-Specific Arch-Favorable
GCC -mcpu=exynos-m4 -mtune=exynos-m4
LLVM -mcpu=exynos-m4 -mtune=exynos-m4


Architecture

The M4 is an incremental microarchitecture that brought a die shrink and minor enhancements.

Key changes from M3

  • 8 nm process (from 10 nm)
  • ARMv8.2 (from ARMv8)
    • Support for full FP16 scalar extension
    • Suppot for integer dot product extension
  • Front end
  • Back end
    • LSU reorganized
    • Floating-point execution units reorganized

This list is incomplete; you can help by expanding it.

Block Diagram

Individual Core

900px

Memory Hierarchy

  • Cache
    • L1I Cache
      • 64 KiB, 4-way set associative
        • 128 B line size
        • per core
      • Parity-protected
    • L1D Cache
      • 64 KiB, 8-way set associative
        • 64 B line size
        • per core
      • 4 cycles for fastest load-to-use
      • 32 B/cycle load bandwidth
      • 16 B/cycle store bandwidth
    • L2 Cache
      • 512 KiB, 8-way set associative
      • Inclusive of L1
      • 12 cycles latency
      • 32 B/cycle bandwidth
    • L3 Cache
      • 4 MiB, 16-way set associative
        • 1 MiB slice/core
      • Exlusive of L2
      • ~37-cycle typical (NUCA)
    • BIU
      • 80 outstanding transactions

Mongoose 1 TLB consists of dedicated L1 TLB for instruction cache (ITLB) and another one for data cache (DTLB). Additionally, there is a unified L2 TLB (STLB).

  • TLBs
    • ITLB
      • 512-entry
    • DTLB
      • 32-entry
      • 512-entry Mid-level DTLB
    • STLB
      • 4,096-entry
      • Per core
  • BPU
    • 4K-entry main BTB
    • 128-entry µBTB
    • 64-entry return stack
    • 16K-entry L2 BTB

Core

The core of the M4 is largely the same as M3.

Execution engine

Floating-point cluster

New text document.svg This section is empty; you can help add the missing info by editing this page.

Memory subsystem

New text document.svg This section is empty; you can help add the missing info by editing this page.
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Facts about "Exynos M4 - Microarchitectures - Samsung"
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codenameMongoose 4 +
designerSamsung +
first launched2018 +
full page namesamsung/microarchitectures/m4 +
instance ofmicroarchitecture +
instruction set architectureARMv8 +
manufacturerSamsung +
microarchitecture typeCPU +
nameMongoose 4 +
process8 nm (0.008 μm, 8.0e-6 mm) +