[PATCH] D40215: [X86][AVX512] Use PACKSS/PACKUS for vXi16->vXi8 truncations without BWI.

[Elena Demikhovsky via Phabricator via llvm-commits]

delena added inline comments.


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Comment at: test/CodeGen/X86/vector-compare-results.ll:320
 ; AVX512F-NEXT:    vpcmpgtw %ymm1, %ymm0, %ymm0
-; AVX512F-NEXT:    vpmovsxwd %ymm0, %zmm0
-; AVX512F-NEXT:    vpmovdb %zmm0, %xmm0
+; AVX512F-NEXT:    vextracti128 $1, %ymm0, %xmm1
+; AVX512F-NEXT:    vpacksswb %xmm1, %xmm0, %xmm0
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You are inserting AVX2 instructions instead of AVX-512, right? If yes, the prev code is better, since we have more registers in AVX-512.


Repository:
  rL LLVM

https://reviews.llvm.org/D40215