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

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  <james.greenhalgh@arm.com>

	* 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.

From-SVN: r249441

1 files changed, 8 insertions, 6 deletions

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 86c8d62..7e7a16a5 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -14077,17 +14077,19 @@ processors implementing the target architecture.
 @opindex mtune
 Specify the name of the target processor for which GCC should tune the
 performance of the code.  Permissible values for this option are:
-@samp{generic}, @samp{cortex-a35}, @samp{cortex-a53}, @samp{cortex-a57},
-@samp{cortex-a72}, @samp{cortex-a73}, @samp{exynos-m1},
-@samp{xgene1}, @samp{vulcan}, @samp{thunderx},
+@samp{generic}, @samp{cortex-a35}, @samp{cortex-a53}, @samp{cortex-a55},
+@samp{cortex-a57}, @samp{cortex-a72}, @samp{cortex-a73}, @samp{cortex-a75},
+@samp{exynos-m1}, @samp{xgene1}, @samp{vulcan}, @samp{thunderx},
 @samp{thunderxt88}, @samp{thunderxt88p1}, @samp{thunderxt81},
 @samp{thunderxt83}, @samp{thunderx2t99}, @samp{cortex-a57.cortex-a53},
 @samp{cortex-a72.cortex-a53}, @samp{cortex-a73.cortex-a35},
-@samp{cortex-a73.cortex-a53}, @samp{native}.
+@samp{cortex-a73.cortex-a53}, @samp{cortex-a75.cortex-a55},
+@samp{native}.
 
 The values @samp{cortex-a57.cortex-a53}, @samp{cortex-a72.cortex-a53},
-@samp{cortex-a73.cortex-a35}, @samp{cortex-a73.cortex-a53}
-specify that GCC should tune for a big.LITTLE system.
+@samp{cortex-a73.cortex-a35}, @samp{cortex-a73.cortex-a53},
+@samp{cortex-a75.cortex-a55} specify that GCC should tune for a
+big.LITTLE system.
 
 Additionally on native AArch64 GNU/Linux systems the value
 @samp{native} tunes performance to the host system.  This option has no effect