Chandler Carruth 25b7d54e7f [x86,SDAG] Sink the logic for folding shuffles of splats more ... aggressively from the x86 shuffle lowering to the generic SDAG vector shuffle formation code. This code already tried to fold away shuffles of splats! It just had lots of bugs and couldn't handle the case my new x86 shuffle lowering needed. First, it failed to correctly compute whether N2 was undef because it pre-computed this, then did transformations which could *make* N2 undef, then failed to ever re-consider the precomputed state. Second, it didn't look through bitcasts at all, even in the safe cases where they are just element-type bitcasts with no change to the number of elements. Third, it didn't handle all-zero bit casts nicely the way my code in the x86 side of things did, which is essential to getting good zext-shuffle lowerings. But all of these are generic. I just ported the code down to this layer and fixed the surrounding bugs. Tests exercising this in the x86 backend still pass and some silly code in widen_cast-6.ll gets better. I updated that test to be a bit more precise but it's still pretty unclear what the value of the test is in this day and age. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212517 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-08 08:45:38 +00:00
..
Analysis	fixed typos in comments	2014-07-06 23:24:53 +00:00
AsmParser	Update the MemoryBuffer API to use ErrorOr.	2014-07-06 17:43:13 +00:00
Bitcode	Fix a bug in the conversion to ErrorOr.	2014-07-04 20:05:56 +00:00
CodeGen	[x86,SDAG] Sink the logic for folding shuffles of splats more	2014-07-08 08:45:38 +00:00
DebugInfo	Revert "Introduce a string_ostream string builder facilty"	2014-06-26 22:52:05 +00:00
ExecutionEngine	ExecutionEngine::create(): fix interpreter fallback when JIT is unavailable	2014-07-01 03:18:49 +00:00
IR	Update the MemoryBuffer API to use ErrorOr.	2014-07-06 17:43:13 +00:00
IRReader	Update the MemoryBuffer API to use ErrorOr.	2014-07-06 17:43:13 +00:00
LineEditor	[CMake] Use LINK_LIBS instead of target_link_libraries().	2014-02-26 06:41:29 +00:00
Linker	Include <tuple> to make buildbots happy	2014-06-27 18:38:12 +00:00
LTO	Update the MemoryBuffer API to use ErrorOr.	2014-07-06 17:43:13 +00:00
MC	This only needs a StringRef.	2014-07-06 14:17:29 +00:00
Object	Update the MemoryBuffer API to use ErrorOr.	2014-07-06 17:43:13 +00:00
Option	Revert "Introduce a string_ostream string builder facilty"	2014-06-26 22:52:05 +00:00
ProfileData	Update the MemoryBuffer API to use ErrorOr.	2014-07-06 17:43:13 +00:00
Support	Refactor ARM subarchitecture parsing	2014-07-07 20:01:11 +00:00
TableGen	Update the MemoryBuffer API to use ErrorOr.	2014-07-06 17:43:13 +00:00
Target	[x86,SDAG] Sink the logic for folding shuffles of splats more	2014-07-08 08:45:38 +00:00
Transforms	[ASan] Completely remove sanitizer blacklist file from instrumentation pass.	2014-07-08 00:50:49 +00:00
CMakeLists.txt	ProfileData: Introduce the InstrProfReader interface and a text reader	2014-03-21 17:24:48 +00:00
LLVMBuild.txt	ProfileData: Introduce the InstrProfReader interface and a text reader	2014-03-21 17:24:48 +00:00
Makefile	ProfileData: Introduce the InstrProfReader interface and a text reader	2014-03-21 17:24:48 +00:00