Chandler Carruth 8ac2f142a8 [x86] Make the new vector shuffle lowering lower blends as VSELECT
nodes, and rely exclusively on its logic. This removes a ton of
duplication from the blend lowering and centralizes it in one place.

One downside is that it requires a bunch of hacks to make this work with
the current legalization framework. We have to manually speculate one
aspect of legalizing VSELECT nodes to get everything to work nicely
because the existing legalization framework isn't *actually* bottom-up.

The other grossness is that we somewhat duplicate the analysis of
constant blends. I'm on the fence here. If reviewers thing this would
look better with VSELECT when it has constant operands dumping over tho
VECTOR_SHUFFLE, we could go that way. But it would be a substantial
change because currently all of the actual blend instructions are
matched via patterns in the TD files based around VSELECT nodes (despite
them not being perfect fits for that). Suggestions welcome, but at least
this removes the rampant duplication in the backend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218600 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-29 09:57:07 +00:00
2014-09-26 06:59:15 +00:00
2014-09-29 06:32:54 +00:00
2014-09-27 05:26:42 +00:00

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
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started with LLVM and docs/README.txt for an overview of LLVM's
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If you're writing a package for LLVM, see docs/Packaging.rst for our
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LLVM backend for 6502
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