[PATCH] D138872: [InstCombine] canonicalize trunc + insert as bitcast + shuffle, part 1

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon accepted this revision.
RKSimon added a comment.
This revision is now accepted and ready to land.

LGTM with one (very) minor



================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp:1518
 
+static Instruction *foldTruncInsElt(InsertElementInst &InsElt, bool IsBigEndian,
+                                    InstCombiner::BuilderTy &Builder) {
----------------
Add a head comment describing the fold.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D138872/new/

https://reviews.llvm.org/D138872