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Commit 029a21df authored by Craig Topper's avatar Craig Topper
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[DAGCombiner] Teach visitEXTRACT_SUBVECTOR to turn extracts of BUILD_VECTOR... 

[DAGCombiner] Teach visitEXTRACT_SUBVECTOR to turn extracts of BUILD_VECTOR into smaller BUILD_VECTORs

Only do this before operations are legalized of BUILD_VECTOR is Legal for the target.

Differential Revision: https://reviews.llvm.org/D37186

llvm-svn: 311892
parent 476f21d8
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