[PATCH][arm][1/3] Add -march=armv8.4-a option
Kyrill Tkachov
kyrylo.tkachov@foss.arm.com
Mon Jan 8 18:02:00 GMT 2018
[resending due to mailer problems...]
Hi all,
This patch adds support for the Armv8.4-A architecture [1]
in the arm backend. This is done through the new
-march=armv8.4-a option.
With this patch armv8.4-a is recognised as an argument
and supports the extensions: simd, fp16, crypto, nocrypto,
nofp with the familiar meaning of these options.
Worth noting that there is no dotprod option like in
armv8.2-a and armv8.3-a because Dot Product support is
mandatory in Armv8.4-A when simd is available, so when using
+simd (of fp16 which enables +simd), the +dotprod is implied.
The various multilib selection makefile fragments are updated
too and the mutlilib.exp test gets a few armv8.4-a combination
tests.
Bootstrapped and tested on arm-none-linux-gnueabihf.
Christophe: Can I ask you for a huge favour to give these 3
patches a run through your testing infrastructure if you get
the chance?
The changes should be fairly self-contained
(i.e. touching only -march=armv8.4-a support) but I've gotten
various edge cases with testsuite setup wrong in the past...
Thanks,
Kyrill
[1]
https://community.arm.com/processors/b/blog/posts/introducing-2017s-extensions-to-the-arm-architecture
2017-01-08 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* config/arm/arm-cpus.in (armv8_4): New feature.
(ARMv8_4a): New fgroup.
(armv8.4-a): New arch.
* config/arm/arm-tables.opt: Regenerate.
* config/arm/t-aprofile: Add matching rules for -march=armv8.4-a.
* config/arm/t-arm-elf (all_v8_archs): Add armv8.4-a.
* config/arm/t-multilib (v8_4_a_simd_variants): New variable.
Add matching rules for -march=armv8.4-a and extensions.
* doc/invoke.texi (ARM Options): Document -march=armv8.4-a.
2017-01-08 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* gcc.target/arm/multilib.exp: Add some -march=armv8.4-a
combination tests.
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