[all-commits] [llvm/llvm-project] 5a333d: [AArch64][GlobalISel] Improve legalization for odd...

[Jessica Paquette via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5a333dc5da9fac3407b78d52ad3bc18049f8a73b
      https://github.com/llvm/llvm-project/commit/5a333dc5da9fac3407b78d52ad3bc18049f8a73b
  Author: Jessica Paquette <jpaquette at apple.com>
  Date:   2021-07-28 (Wed, 28 Jul 2021)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-load-store.mir

  Log Message:
  -----------
  [AArch64][GlobalISel] Improve legalization for odd-type G_LOAD

Swap the order of widening so that we widen to the next power-of-2 first when
legalizing G_LOAD.

Also, provide a minimum type for the power of 2 to disallow s2 + s1. Clamping
ought to disallow s2 and s1, but I think it's better to be explicit about the
expected minimum size.

We probably need a similar change for G_STORE, but it seems to be a bit more
finnicky. So, let's just handle G_LOAD for now.

Differential Revision: https://reviews.llvm.org/D107013