Chandler Carruth 04402a6c13 [x86] Undo a flawed transform I added to form UNPCK instructions when ... AVX is available, and generally tidy up things surrounding UNPCK formation. Originally, I was thinking that the only advantage of PSHUFD over UNPCK instruction variants was its free copy, and otherwise we should use the shorter encoding UNPCK instructions. This isn't right though, there is a larger advantage of being able to fold a load into the operand of a PSHUFD. For UNPCK, the operand *must* be in a register so it can be the second input. This removes the UNPCK formation in the target-specific DAG combine for v4i32 shuffles. It also lifts the v8 and v16 cases out of the AVX-specific check as they are potentially replacing multiple instructions with a single instruction and so should always be valuable. The floating point checks are simplified accordingly. This also adjusts the formation of PSHUFD instructions to attempt to match the shuffle mask to one which would fit an UNPCK instruction variant. This was originally motivated to allow it to match the UNPCK instructions in the combiner, but clearly won't now. Eventually, we should add a MachineCombiner pass that can form UNPCK instructions post-RA when the operand is known to be in a register and thus there is no loss. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217755 91177308-0d34-0410-b5e6-96231b3b80d8		2014-09-15 10:35:41 +00:00
..
Analysis	InstSimplify: Simplify trivial and/or of icmps	2014-09-15 08:15:28 +00:00
AsmParser	Make CallingConv::ID an alias of "unsigned".	2014-09-10 18:00:17 +00:00
Bitcode	Pass a && to getLazyBitcodeModule.	2014-09-03 17:31:46 +00:00
CodeGen	In DwarfEHPrepare, after all passes are run, RewindFunction may be a dangling	2014-09-14 20:36:28 +00:00
DebugInfo	Fix ambiguous typedef introduced in r217747.	2014-09-15 08:23:07 +00:00
ExecutionEngine	[MCJIT] Improve the "stub not found" diagnostic in RuntimeDyldChecker.	2014-09-11 23:09:22 +00:00
IR	Fix DebugInfo replaceAllUsesWith.	2014-09-15 07:50:42 +00:00
IRReader	Pass a && to getLazyBitcodeModule.	2014-09-03 17:31:46 +00:00
LineEditor
Linker	Merge alignment of common GlobalValue.	2014-09-09 17:48:18 +00:00
LTO	Add doInitialization/doFinalization to DataLayoutPass.	2014-09-10 21:27:43 +00:00
MC	Object: Add support for bigobj	2014-09-10 12:51:52 +00:00
Object	[llvm-objdump] support -rebase option for mach-o to dump rebasing info	2014-09-12 21:34:15 +00:00
Option	Add an overload of getLastArgNoClaim taking two OptSpecifiers.	2014-09-12 19:42:53 +00:00
ProfileData	llvm-profdata: Avoid undefined behaviour when reading raw profiles	2014-09-12 21:22:55 +00:00
Support	Add support for le64.	2014-09-12 17:54:17 +00:00
TableGen	Comment only: Annotate loop as per mailing list discussion	2014-08-29 22:43:30 +00:00
Target	[x86] Undo a flawed transform I added to form UNPCK instructions when	2014-09-15 10:35:41 +00:00
Transforms	Add control of function merging to the PMBuilder.	2014-09-13 21:46:00 +00:00
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