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[Arm] Modify default tuning of armv8.1-m.main to use Cortex-M55

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Previously, compiling with -march=armv8.1-m.main would tune for
Cortex-M7.
However, the Cortex-M7 only supports up to Armv7e-M. The Cortex-M55 is
the earliest CPU that supports Armv8.1-M Mainline so is more appropriate.
This also has the effect of changing the branch cost function used, which
will be necessary to correctly prioritise conditional instructions over branches
in the rest of this patch series.

Regression tested on arm-none-eabi.

gcc/ChangeLog

2020-08-04  Omar Tahir  <omar.tahir@arm.com>

	* config/arm/arm-cpus.in (armv8.1-m.main): Tune for Cortex-M55.
This commit is contained in:
Omar Tahir 2020-08-04 17:35:18 +01:00 committed by Kyrylo Tkachov
parent 03c547d665
commit 079b13f64c
1 changed files with 1 additions and 1 deletions
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gcc/config/arm/arm-cpus.in
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@ -716,7 +716,7 @@ begin arch armv8-r
end arch armv8-r
begin arch armv8.1-m.main
tune for cortex-m7
tune for cortex-m55
tune flags CO_PROC
base 8M_MAIN
profile M