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From: Omar Tahir <Omar.Tahir@arm.com>
To: Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>, "nickc@redhat.com"
<nickc@redhat.com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Richard Earnshaw <Richard.Earnshaw@arm.com>, "gcc-patches@gcc.gnu.org"
<gcc-patches@gcc.gnu.org>
Subject: [PATCH 1/5][Arm] Modify default tuning of armv8.1-m.main to use
Cortex-M55
Thread-Topic: [PATCH 1/5][Arm] Modify default tuning of armv8.1-m.main to use
Cortex-M55
Thread-Index: AdZqeW2QNu1jRYBhRM22mWs4QV21Jg==
Date: Tue, 4 Aug 2020 16:09:57 +0000
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|
| Series |
Add support for conditional instructions (CSEL, CSINC etc.) for Armv8.1-M Mainline
|
expand
|
Hi Omar,
Ok, thanks.
I've pushed this to master.
Kyrill
From: Omar Tahir <Omar.Tahir@arm.com>
Sent: 04 August 2020 17:10
To: Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>; nickc@redhat.com; Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>; Richard Earnshaw <Richard.Earnshaw@arm.com>; gcc-patches@gcc.gnu.org
Subject: [PATCH 1/5][Arm] Modify default tuning of armv8.1-m.main to use Cortex-M55
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:
2020-07-30: Omar Tahir <omar.tahir@arm.com<mailto:omar.tahir@arm.com>>
* config/arm/arm-cpus.in (armv8.1-m.main): Tune for Cortex-M55.
diff --git a/gcc/config/arm/arm-cpus.in b/gcc/config/arm/arm-cpus.in
index 728be500b80..c98f8ede8fd 100644
--- a/gcc/config/arm/arm-cpus.in
+++ b/gcc/config/arm/arm-cpus.in
@@ -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
diff --git a/gcc/config/arm/arm-cpus.in b/gcc/config/arm/arm-cpus.in index 728be500b80..c98f8ede8fd 100644 --- a/gcc/config/arm/arm-cpus.in +++ b/gcc/config/arm/arm-cpus.in @@ -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
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: 2020-07-30: Omar Tahir <omar.tahir@arm.com> * config/arm/arm-cpus.in (armv8.1-m.main): Tune for Cortex-M55.