Re: [GCC 13 PATCH] aarch64: Remove architecture dependencies from intrinsics

[Ramana Radhakrishnan <ramana.gcc@googlemail.com>]

On Wed, Jul 19, 2023 at 5:44 PM Andrew Carlotti via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> Updated patch to fix the fp16 intrinsic pragmas, and pushed to master.
> OK to backport to GCC 13?
>
>
> Many intrinsics currently depend on both an architecture version and a
> feature, despite the corresponding instructions being available within
> GCC at lower architecture versions.
>
> LLVM has already removed these explicit architecture version
> dependences; this patch does the same for GCC. Note that +fp16 does not
> imply +simd, so we need to add an explicit +simd for the Neon fp16
> intrinsics.
>
> Binutils did not previously support all of these architecture+feature
> combinations, but this problem is already reachable from GCC.  For
> example, compiling the test gcc.target/aarch64/usadv16qi-dotprod.c
> with -O3 -march=armv8-a+dotprod has resulted in an assembler error since
> GCC 10.  This is fixed in Binutils 2.41.

Are there any implementations that actually implement v8-a + dotprod
?. As far as I'm aware this was v8.2-A as the base architecture where
this was allowed. Has this changed recently?


regards
Ramana