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GCC implements extensions for C and C++ as described in the Arm C LanguageExtensions (ACLE) specification, which can be found athttps://arm-software.github.io/acle/main/.
As a part of ACLE, GCC implements extensions for Arm Vector extensionsas described in the Arm C Language Extensions Specification. The completelist of Arm Vector extension intrinsics is available athttps://arm-software.github.io/acle/main/.The built-in intrinsics for the Arm vector extensions are available whenthe respective extensions are enabled.
Not all aspects of ACLE are supported. Support for each feature of the ACLEis determined with the__ARM_FEATURE_X macros.
SeeARM Options andAArch64 Options for more information on theavailability of extensions.