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| <h4 class="subsection">6.58.7 ARM C Language Extensions (ACLE)</h4> |
| |
| <p>GCC implements extensions for C as described in the ARM C Language |
| Extensions (ACLE) specification, which can be found at |
| <a href="http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf">http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf</a>. |
| </p> |
| <p>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 |
| <a href="http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf">http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf</a>. |
| The built-in intrinsics for the Advanced SIMD extension are available when |
| NEON is enabled. |
| </p> |
| <p>Currently, ARM and AArch64 back ends do not support ACLE 2.0 fully. Both |
| back ends support CRC32 intrinsics from <samp>arm_acle.h</samp>. The ARM back end’s |
| 16-bit floating-point Advanced SIMD intrinsics currently comply to ACLE v1.1. |
| AArch64’s back end does not have support for 16-bit floating point Advanced SIMD |
| intrinsics yet. |
| </p> |
| <p>See <a href="ARM-Options.html#ARM-Options">ARM Options</a> and <a href="AArch64-Options.html#AArch64-Options">AArch64 Options</a> for more information on the |
| availability of extensions. |
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