[all-commits] [llvm/llvm-project] 9237ed: Revert "[AArch64][GlobalISel] Legalize bswap <2 x ...

[Jon Roelofs via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9237eda3040738e98e985b39ce6a3c1fc71eaa56
      https://github.com/llvm/llvm-project/commit/9237eda3040738e98e985b39ce6a3c1fc71eaa56
  Author: Jon Roelofs <jonathan_roelofs at apple.com>
  Date:   2021-09-01 (Wed, 01 Sep 2021)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.h
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-bswap.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir

  Log Message:
  -----------
  Revert "[AArch64][GlobalISel] Legalize bswap <2 x i16>"

This reverts commit 5cd63e9ec2a385de2682949c0bbe928afaf35c91.

https://bugs.llvm.org/show_bug.cgi?id=51707

The sequence feeding in/out of the rev32/ushr isn't quite right:

 _swap:
         ldr     h0, [x0]
         ldr     h1, [x0, #2]
-        mov     v0.h[1], v1.h[0]
+        mov     v0.s[1], v1.s[0]
         rev32   v0.8b, v0.8b
         ushr    v0.2s, v0.2s, #16
-        mov     h1, v0.h[1]
+        mov     s1, v0.s[1]
         str     h0, [x0]
         str     h1, [x0, #2]
         ret