GCC Working On ARMv8.1, Clang Working On ARMv8.2 Support

Patches were published by ARM for implementing ARMv8.1 support within the GCC compiler.

ARM's Matthew Wahab posted the new patch series yesterday, "ARMv8.1 includes an extension to ARM which adds two Adv.SIMD instructions, vqrdmlah and vqrdmlsh. This patch set adds support for ARMv8.1 and for the new instructions, enabling the architecture with --march=armv8.1-a. The new instructions are enabled when both ARMv8.1 and a suitable fpu options are set, for instance with -march=armv8.1-a -mfpu=neon-fp-armv8 -mfloat-abi=hard."

Back in May is when LLVM Clang landed ARMv8.1 support.

Coincidentally, LLVM Clang yesterday landed ARMv8.2-A support. "This adds subtarget features for ARMv8.2-A, which builds on (and requires the features from) ARMv8.1-A. Most assembler-visible features of ARMv8.2-A are system instructions, and are all required parts of the architecture, so just depend on the HasV8_2aOps subtarget feature. There is also one large, optional feature, which adds 16-bit floating point versions of all existing floating-point instructions (VFP and SIMD), this is represented by the FeatureFullFP16 subtarget feature."