[PATCH] D143786: [X86] Add `TuningPreferShiftShuffle` for when Shifts are preferable to shuffles.

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added inline comments.


================
Comment at: llvm/test/CodeGen/X86/min-legal-vector-width.ll:173-206
+; CHECK-AVX512-LABEL: _Z9test_charPcS_i_256:
+; CHECK-AVX512:       # %bb.0: # %entry
+; CHECK-AVX512-NEXT:    movl %edx, %eax
+; CHECK-AVX512-NEXT:    vpxor %xmm0, %xmm0, %xmm0
+; CHECK-AVX512-NEXT:    xorl %ecx, %ecx
+; CHECK-AVX512-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; CHECK-AVX512-NEXT:    vpxor %xmm2, %xmm2, %xmm2
----------------
Tests for other conditions are gone. You may need to tune the combinations in `--check-prefixes`.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D143786/new/

https://reviews.llvm.org/D143786