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author	Craig Topper <craig.topper@intel.com>
	Sun, 3 Sep 2017 17:52:19 +0000 (17:52 +0000)
committer	Craig Topper <craig.topper@intel.com>
	Sun, 3 Sep 2017 17:52:19 +0000 (17:52 +0000)
commit	05f56c0b3fe89658b1f563cb5cfc0405582474d3
tree	c7442c7dda42908d34c12012bc2c73ff0ae30148	tree \| snapshot
parent	74c232b75f3aa0b64ca287c5e0cb29dce1bd1ca8	commit \| diff

[X86] Canonicalize (concat_vectors X, zero) -> (insert_subvector zero, X, 0).

In a future patch, I plan to teach isel to use a small vector move with implicit zeroing of the upper elements when it sees the (insert_subvector zero, X, 0) pattern.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312448 91177308-0d34-0410-b5e6-96231b3b80d8

external/llvm

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lib/Target/X86/X86ISelLowering.cpp		diff \| blob \| history
test/CodeGen/X86/avx-intrinsics-fast-isel.ll		diff \| blob \| history
test/CodeGen/X86/avx512-intrinsics-fast-isel.ll		diff \| blob \| history
test/CodeGen/X86/madd.ll		diff \| blob \| history
test/CodeGen/X86/merge-consecutive-loads-256.ll		diff \| blob \| history
test/CodeGen/X86/merge-consecutive-loads-512.ll		diff \| blob \| history
test/CodeGen/X86/vector-shuffle-variable-256.ll		diff \| blob \| history