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configure: aarch64: Support assembling the dotprod and i8mm arch extensions

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These are available since ARMv8.4-a and ARMv8.6-a respectively,
but can also be available optionally since ARMv8.2-a.

Check if ".arch armv8.2-a" and ".arch_extension {dotprod,i8mm}" are
supported, and check if the instructions can be assembled.

Current clang versions fail to support the dotprod and i8mm
features in the .arch_extension directive, but do support them
if enabled with -march=armv8.4-a on the command line. (Curiously,
lowering the arch level with ".arch armv8.2-a" doesn't make the
extensions unavailable if they were enabled with -march; if that
changes, Clang should also learn to support these extensions via
.arch_extension for them to remain usable here.)

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2023-05-25 14:57:37 +03:00
parent fa11c4c7fa
commit fb1b88af77
2 changed files with 91 additions and 1 deletions
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11
libavutil/aarch64/asm.S
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@ -36,6 +36,17 @@
# define __has_feature(x) 0
#endif
#if HAVE_AS_ARCH_DIRECTIVE
.arch AS_ARCH_LEVEL
#endif
#if HAVE_AS_ARCHEXT_DOTPROD_DIRECTIVE
.arch_extension dotprod
#endif
#if HAVE_AS_ARCHEXT_I8MM_DIRECTIVE
.arch_extension i8mm
#endif
/* Support macros for
* - Armv8.3-A Pointer Authentication and