[Patch AArch64] Add initial tuning support for Cortex-A55 and Cortex-A75

Programming / Compilers / GCC - jgreenhalgh [138bc75d-0d04-0410-961f-82ee72b054a4] - 21 June 2017 05:58 EDT

This patch adds support for the ARM Cortex-A75 and Cortex-A55 processors through the -mcpu/-mtune values cortex-a55 and cortex-a75, and an ARM DynamIQ big.LITTLE configuration of these two processors through the -mcpu/-mtune value cortex-a75.cortex-a55

The ARM Cortex-A75 is ARM's latest and highest performance applications processor. For the initial tuning provided in this patch, I have chosen to share the tuning structure with its predecessor, the Cortex-A73.

The ARM Cortex-A55 delivers the best combination of power efficiency and performance in its class. For the initial tuning provided in this patch, I have chosen to share the tuning structure with its predecessor, the Cortex-A53.

Both Cortex-A55 and Cortex-A75 support ARMv8-A with the ARM8.1-A and ARMv8.2-A extensions, along with the cryptography extension, and the RCPC extensions from ARMv8.3-A. This is reflected in the patch,-mcpu=cortex-a75 is treated as equivalent to passing -mtune=cortex-a75
-march=armv8.2-a+rcpc .

2017-06-21 James Greenhalgh

- config/aarch64/aarch64-cores.def (cortex-a55): New. (cortex-a75): Likewise. (cortex-a75.cortex-a55): Likewise.
- config/aarch64/aarch64-tune.md: Regenerate.
- doc/invoke.texi (-mtune): Document new values for -mtune.

0bf5748 [Patch AArch64] Add initial tuning support for Cortex-A55 and Cortex-A75
gcc/ChangeLog | 8 ++++++++
gcc/config/aarch64/aarch64-cores.def | 10 ++++++++++
gcc/config/aarch64/aarch64-tune.md | 2 +-
gcc/doc/invoke.texi | 14 ++++++++------
4 files changed, 27 insertions(+), 7 deletions(-)

Upstream: gcc.gnu.org


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