[PATCH] D69127: [DAGCombiner] widen zext of popcount based on target support

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

any_extend might get generated when using ctpop for 'allones' tests:

  define i64 @var_ctpop_i32(i32 %a) {
    %1 = call i32 @llvm.ctpop.i32(i32 %a)
    %2 = zext i32 %1 to i64 ; SimplifyDemandedBits may turn zext (or sext) into aext
    %3 = and i64 %2, 32
    ret i64 %3
  }
  declare i32 @llvm.ctpop.i32(i32)


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69127/new/

https://reviews.llvm.org/D69127