[PATCH] D58705: [X86] Don't peek through bitcasts before checking ISD::isBuildVectorOfConstantSDNodes in combineTruncatedArithmetic

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

Compiling this with "-mattr=avx2 -mtriple=i686-unknown-unknown" should be enough to hit the bug. I'll get that turned into a real test case later tonight.

  define <8 x i32> @foo(<8 x i64> %x, <4 x i64> %y) {
    %a = shufflevector <4 x i64> %y, <4 x i64> <i64 12345, i64 67890, i64 13579, i64 24680>, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
    %b = and <8 x i64> %x, %a
    %c = trunc <8 x i64> %b to <8 x i32>
    ret <8 x i32> %c
  }


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58705/new/

https://reviews.llvm.org/D58705