[LLVMbugs] [Bug 22283] suboptimal AVX splat

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Feb 17 09:09:36 PST 2015


Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Sanjay Patel <spatel+llvm at rotateright.com> ---
(In reply to comment #1)
> The problem is that vbroadcastsd only supports splatting loads at AVX1, its
> AVX2 that adds support for splatting from xmm registers.

Wow, I never noticed that hole before. Another clause in the X86 Employment

In any case, patch to canonicalize all splats as build vectors checked in, so
we at least improve the load version for AVX1:

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