[PATCH] D107068: [DAG] DAGCombiner::visitVECTOR_SHUFFLE - recognise INSERT_SUBVECTOR patterns.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/test/CodeGen/X86/vector-shuffle-512-v16.ll:580
 ; ALL-NEXT:    vmovapd {{.*#+}} zmm2 = [0,1,12,13,4,5,6,7]
 ; ALL-NEXT:    vpermt2pd %zmm1, %zmm2, %zmm0
 ; ALL-NEXT:    retq
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we still miss this test case - we need to add some form of concat(concat(x,y),concat(z,w)) -> concat(x,y,z,w) fold.


Repository:
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https://reviews.llvm.org/D107068