[PATCH] D99980: [SLP]Improve cost model for the vectorized extractelements.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


================
Comment at: llvm/test/Transforms/SLPVectorizer/X86/alternate-int-inseltpoison.ll:123
+; AVX1-NEXT:    [[TMP6:%.*]] = shufflevector <4 x i32> [[TMP5]], <4 x i32> undef, <8 x i32> <i32 undef, i32 undef, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef>
+; AVX1-NEXT:    [[TMP7:%.*]] = shl <8 x i32> [[A]], [[B]]
 ; AVX1-NEXT:    [[R0:%.*]] = insertelement <8 x i32> poison, i32 [[AB0]], i32 0
----------------
Why do we have both a v4i32 and v8i32 shl in here?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D99980/new/

https://reviews.llvm.org/D99980