# ARM Cortex-A57

> microarchitecture implementing the ARMv8-A 64-bit instruction set designed by ARM Holdings

**Wikidata**: [Q17112311](https://www.wikidata.org/wiki/Q17112311)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/ARM_Cortex-A57)  
**Source**: https://4ort.xyz/entity/arm-cortex-a57

## Summary
The ARM Cortex-A57 is a 64-bit microprocessor core implementing the ARMv8-A instruction set, designed by ARM Holdings and used in mobile processors like Qualcomm's Snapdragon chips.

## Key Facts
- It is a 64-bit microprocessor core implementing the ARMv8-A instruction set
- Announced on October 30, 2012
- Developed by ARM Holdings
- Follows the ARM Cortex-A17 and is followed by the ARM Cortex-A72
- Used in Qualcomm's Snapdragon 810 and Snapdragon 808 system-on-a-chips
- Based on the AArch64 architecture
- Implements multiple instruction sets including A64, A32, and T32
- Part of the ARM Cortex-A family of processor cores
- Has aliases including Cortex-A57 and ARM Cortex-A57 MPCore

### Q: What is the ARM Cortex-A57?
A: It's a 64-bit microprocessor core implementing the ARMv8-A instruction set designed by ARM Holdings, used primarily in mobile devices.

### Q: When was the ARM Cortex-A57 announced?
A: It was announced on October 30, 2012.

### Q: What instruction sets does it support?
A: It implements the A64, A32, and T32 instruction sets as part of the ARMv8-A architecture.

### Q: What is its position in the ARM processor family?
A: It follows the ARM Cortex-A17 and is followed by the ARM Cortex-A72, being part of the ARM Cortex-A series.

## Why It Matters
The ARM Cortex-A57 represents a significant advancement in mobile computing architecture, marking the transition to 64-bit processing for smartphones and tablets. It was designed to provide a balance between performance and power efficiency, addressing the growing demands of modern mobile applications while maintaining ARM's traditional low-power advantages. The introduction of the Cortex-A57 helped establish 64-bit processing as a standard in mobile devices, paving the way for more powerful and capable smartphones and tablets. Its implementation in high-end mobile processors like Qualcomm's Snapdragon 810 and 808 demonstrated the practicality and benefits of 64-bit computing in consumer devices.

## Notable For
- First 64-bit processor core in the ARM Cortex-A family
- Designed to balance performance and power efficiency
- Used in high-end mobile devices requiring both speed and battery life
- Part of the ARMv8-A architecture that introduced 64-bit capabilities
- Implemented multiple instruction sets for backward compatibility

## Body
### Technical Architecture
The ARM Cortex-A57 is a 64-bit microprocessor core implementing the ARMv8-A instruction set architecture. It was designed by ARM Holdings as part of their Cortex-A series of processor cores. The core features a 3-issue superscalar design with out-of-order execution capabilities, supporting up to 4 threads simultaneously through its support for the ARMv8-A architecture's thread-level parallelism features.

### Instruction Set Support
The Cortex-A57 implements multiple instruction sets as part of the ARMv8-A architecture:
- **A64**: The primary 64-bit instruction set for modern applications
- **A32**: Backward compatibility with ARMv7 architecture
- **T32**: Thumb-2 instruction set for 32-bit applications

This multi-instruction set support allows devices to run both 32-bit and 64-bit applications simultaneously, providing a smooth transition path for manufacturers upgrading from 32-bit to 64-bit systems.

### Performance Characteristics
The Cortex-A57 was designed to deliver significant performance improvements while maintaining ARM's traditional power efficiency advantages. It features a 3-issue superscalar pipeline with out-of-order execution capabilities, allowing it to execute up to three instructions per cycle under optimal conditions. The core includes a 32KB instruction cache and 32KB data cache, with optional larger cache configurations in system-on-chip implementations.

### Implementation in Commercial Products
The Cortex-A57 was first implemented in Qualcomm's Snapdragon 810 and Snapdragon 808 system-on-a-chips, which were designed for high-end smartphones and tablets. These chips combined the Cortex-A57 with other ARM cores (like the Cortex-A53) to create heterogeneous multi-core systems that balanced performance with power consumption. The Snapdragon 810, in particular, was marketed as a flagship processor for premium mobile devices.

### Evolution and Successors
The Cortex-A57 was positioned as a mid-range to high-end processor core, serving as a bridge between the 32-bit Cortex-A15 and the more advanced 64-bit Cortex-A72. Its successor, the ARM Cortex-A72, introduced further performance improvements and power efficiency enhancements, while maintaining compatibility with the ARMv8-A architecture.

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## References

1. [Source](https://developer.arm.com/ip-products/processors/cortex-a/cortex-a57)
2. [Qualcomm](https://www.qualcomm.com/products/snapdragon/processors/810)
3. [Qualcomm](https://www.qualcomm.com/products/snapdragon/processors/808)
4. [Source](http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0488c/CHDBBFAJ.html)
5. [Source](https://www.engadget.com/2012/10/30/arm-cortex-a50/)