Chandler Carruth 98eac0a244 [x86] Re-apply a variant of the x86 side of r212324 now that the rest ... has settled without incident, removing the x86-specific and overly strict 'isVectorSplat' routine in favor of generic and more powerful splat detection. The primary motivation and result of this is that the x86 backend can now see through splats which contain undef elements. This is essential if we are using a widening form of legalization and I've updated a test case to also run in that mode as before this change the generated code for the test case was completely scalarized. This version of the patch much more carefully handles the undef lanes. - We aren't overly conservative about them in the shift lowering (where we will never use the splat itself). - One place where the splat would have been re-used by the existing code now explicitly constructs a new constant splat that will be safe. - The broadcast lowering is much more reasonable with undefs by doing a correct check of whether the splat is the only user of a loaded value, checking that the splat actually crosses multiple lanes before using a broadcast, and handling broadcasts of non-constant splats. As a consequence of the last bullet, the weird usage of vpshufd instead of vbroadcast is gone, and we actually can lower an AVX splat with vbroadcastss where before we emitted a really strange pattern of a vector load and a manual splat across the vector. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212602 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-09 10:06:58 +00:00
..
Analysis	Improve BasicAA CS-CS queries	2014-07-08 23:16:49 +00:00
Assembler
Bindings
Bitcode
BugPoint
CodeGen	[x86] Re-apply a variant of the x86 side of r212324 now that the rest	2014-07-09 10:06:58 +00:00
DebugInfo
ExecutionEngine
Feature
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Instrumentation
Integer
JitListener
Linker
LTO
MC	[ms-coff] Add a test for proper handling of full Windows path names in the .drectve section	2014-07-09 00:40:50 +00:00
Object	Changed the lvm-nm alias "-s" for -print-armap to "-M".	2014-07-08 23:47:31 +00:00
Other
TableGen
tools
Transforms	Revert "GlobalDCE: Delete available_externally initializers if it allows removing the value the initializer is referring to."	2014-07-08 17:06:03 +00:00
Unit
Verifier
YAMLParser
.clang-format
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Makefile.tests
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