[PATCH] D95235: [InstCombine] narrow abs with sign-extended input

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon accepted this revision.
RKSimon added a comment.

Cheers - please can you add the PR48816 test case

  define i8 @transform_abs_epi8(i8 %0) {
    %2 = sext i8 %0 to i32
    %3 = tail call i32 @llvm.abs.i32(i32 %2, i1 true)
    %4 = trunc i32 %3 to i8
    ret i8 %4
  }
  declare i32 @llvm.abs.i32(i32, i1 immarg)

(and vector equivalent)


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  https://reviews.llvm.org/D95235/new/

https://reviews.llvm.org/D95235