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7c611d59cc
Author: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Mon Feb 23 23:04:28 2015 +0000
Fix based on post-commit comment on D7816 & rL230177 - BUILD_VECTOR operand truncation was using the the BV's output scalar type instead of the input type.
and
Author: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Sun Feb 22 18:17:28 2015 +0000
[DagCombiner] Generalized BuildVector Vector Concatenation
The CONCAT_VECTORS combiner pass can transform the concat of two BUILD_VECTOR nodes into a single BUILD_VECTOR node.
This patch generalises this to support any number of BUILD_VECTOR nodes, and also permits UNDEF nodes to be included as well.
This was noticed as AVX vec128 -> vec256 canonicalization sometimes creates a CONCAT_VECTOR with a real vec128 lower and an vec128 UNDEF upper.
Differential Revision: http://reviews.llvm.org/D7816
as the root cause of PR22678 which is causing an assertion inside the DAG combiner.
I'll follow up to the main thread as well.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230358 91177308-0d34-0410-b5e6-96231b3b80d8
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