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Michael Kuperstein fd350586f5 [DAGCombine] Slightly improve lowering of BUILD_VECTOR into a shuffle.
This handles the case of a BUILD_VECTOR being constructed out of elements extracted from a vector twice the size of the result vector. Previously this was always scalarized. Now, we try to construct a shuffle node that feeds on extract_subvectors.

This fixes PR15872 and provides a partial fix for PR21711.

Differential Revision: http://reviews.llvm.org/D6678

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224429 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-17 12:32:17 +00:00
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docs IR: Make metadata typeless in assembly 2014-12-15 19:07:53 +00:00
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include [DAGCombine] Slightly improve lowering of BUILD_VECTOR into a shuffle. 2014-12-17 12:32:17 +00:00
lib [DAGCombine] Slightly improve lowering of BUILD_VECTOR into a shuffle. 2014-12-17 12:32:17 +00:00
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test [DAGCombine] Slightly improve lowering of BUILD_VECTOR into a shuffle. 2014-12-17 12:32:17 +00:00
tools Remove unused includes and out of date comment. NFC. 2014-12-17 03:07:20 +00:00
unittests Remove 'metadata' from comments 2014-12-16 07:45:05 +00:00
utils On behalf of Matthew Wahab: 2014-12-16 18:16:17 +00:00
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