Semiconductor & Computer Engineering
(→Compiler support) |
(typo fix : form -> from) |
||
| Line 41: | Line 41: | ||
* Fully synthesizable RTL (prior designs were hand/automated layout) | * Fully synthesizable RTL (prior designs were hand/automated layout) | ||
* [[40 nm process]] (from [[65 nm]]) | * [[40 nm process]] (from [[65 nm]]) | ||
| − | * New [[out-of-order]] pipeline ( | + | * New [[out-of-order]] pipeline (from [[in-order]]) |
** Shorter pipeline (9-12 stages, down from 13) | ** Shorter pipeline (9-12 stages, down from 13) | ||
* 2x frequency (2 GHz, up from 1 GHz) | * 2x frequency (2 GHz, up from 1 GHz) | ||
Revision as of 10:44, 28 May 2019
| Edit Values | |
| Cortex-A9 µarch | |
| General Info | |
| Arch Type | CPU |
| Designer | ARM Holdings |
| Manufacturer | TSMC |
| Introduction | October 3, 2007 |
| Process | 40 nm |
| Instructions | |
| ISA | ARMv7 |
| Succession | |
Cortex-A9 is the successor to the Cortex-A8, a low-power performance ARM microarchitecture designed by ARM Holdings for the mobile market. This microarchitecture is designed as a synthesizable IP core and is sold to other semiconductor companies to be implemented in their own chips.
The Cortex-A9 was later succeeded by four independent lines - high-performance (A15), mainstream performance (A12), high efficiency (A7), and ultra-low power (A5).
Compiler support
| Compiler | Arch-Specific | Arch-Favorable |
|---|---|---|
| Arm Compiler | -mcpu=cortex-a9 |
-mtune=cortex-a9
|
| GCC | -mcpu=cortex-a9 |
-mtune=cortex-a9
|
| LLVM | -mcpu=cortex-a9 |
-mtune=cortex-a9
|
One can specify NEON support using the -mfpu=neon option. Note that GCC will not generate floating-point operations for auto-vectorization constructs because NEON, under ARMv7, is not fully IEEE 754-compliant. It's possible to use -funsafe-math-optimizations to circumvent that behavior.
Architecture
Key changes from Cortex-A8
- Fully synthesizable RTL (prior designs were hand/automated layout)
- 40 nm process (from 65 nm)
- New out-of-order pipeline (from in-order)
- Shorter pipeline (9-12 stages, down from 13)
- 2x frequency (2 GHz, up from 1 GHz)
- NEON
- Added Half precision support
This list is incomplete; you can help by expanding it.
Licensees
Arm named the following companies as licensees.
| codename | Cortex-A9 + |
| designer | ARM Holdings + |
| first launched | October 3, 2007 + |
| full page name | arm holdings/microarchitectures/cortex-a9 + |
| instance of | microarchitecture + |
| instruction set architecture | ARMv7 + |
| manufacturer | TSMC + |
| microarchitecture type | CPU + |
| name | Cortex-A9 + |
| process | 40 nm (0.04 μm, 4.0e-5 mm) + |