[PATCH][AArch64] implement aarch64 neon instruction class AdvSIMD (3 diff)

[Tim Northover]

Hi Jiangning,

On 26 Aug 2013, at 11:13, Jiangning Liu <liujiangning1 at gmail.com> wrote:
> int_arm_neon_vaddhn/int_arm_neon_vmulls and friends are all defined by ARM target. I agree with your comments, but does it imply ARM back-end has inappropriate implementation?

Certainly suboptimal, I'd say. The ARM implementation looks like it dates from at least 2009, when LLVM didn't have anything approaching auto-vectorisation, OpenCL was just a glint in Khronos's eye and the only real way to get vector code was via the NEON intrinsics.

I'd be willing to work on the ARM side if you like; if we coordinate the changes then we could switch Clang over to using the more natural IR on both ARM and AArch64 simultaneously.

Cheers.

Tim.