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#### 6.57.7 ARM C Language Extensions (ACLE)

GCC implements extensions for C as described in the ARM C Language Extensions (ACLE) specification, which can be found at http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf.

As a part of ACLE, GCC implements extensions for Advanced SIMD as described in the ARM C Language Extensions Specification. The complete list of Advanced SIMD intrinsics can be found at http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf. The built-in intrinsics for the Advanced SIMD extension are available when NEON is enabled.

Currently, ARM and AArch64 back-ends do not support ACLE 2.0 fully. Both back-ends support CRC32 intrinsics from `arm_acle.h`. The ARM backend’s 16-bit floating-point Advanded SIMD Intrinsics currently comply to ACLE v1.1. AArch64’s backend does not have support for 16-bit floating point Advanced SIMD Intrinsics yet.

See ARM Options and AArch64 Options for more information on the availability of extensions.