[PATCH] D146357: [X86] Alternative algorithm for vector-vector shifts

[LuoYuanke via Phabricator via llvm-commits]

LuoYuanke added inline comments.


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Comment at: llvm/test/CodeGen/X86/avx2-shift.ll:547
+; X64-NEXT:    vpsllvd %xmm1, %xmm0, %xmm0
+; X64-NEXT:    vpblendw {{.*#+}} xmm0 = xmm0[0],xmm3[1],xmm0[2],xmm3[3],xmm0[4],xmm3[5],xmm0[6],xmm3[7]
 ; X64-NEXT:    retq
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The instruction count seems to increase from 5 to 7. Could you check if it improves performance with "https://uica.uops.info" or llvm-mca? 


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  https://reviews.llvm.org/D146357/new/

https://reviews.llvm.org/D146357