Chandler Carruth a46e60eb2e [x86] Generalize BuildVectorSDNode::getConstantSplatValue to work for ... any constant, constant FP, or undef splat and to tolerate any undef lanes in a splat, then replace all uses of isSplatVector in X86's lowering with it. This fixes issues where undef lanes in an otherwise splat vector would prevent the splat logic from firing. It is a touch more awkward to use this interface, but it is much more accurate. Suggestions for better interface structuring welcome. With this fix, the code generated with the widening legalization strategy for widen_cast-4.ll is *dramatically* improved as the special lowering strategies for a v16i8 SRA kick in even though the high lanes are undef. We also get a slightly different choice for broadcasting an aligned memory location, and use vpshufd instead of vbroadcastss. This looks like a minor win for pipelining and domain crossing, but a minor loss for the number of micro-ops. I suspect its a wash, but folks can easily tweak the lowering if they want. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212324 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-04 08:11:49 +00:00
..
Analysis	InstSimplify: Fix a bug when INT_MIN is in a sdiv	2014-07-04 00:23:39 +00:00
AsmParser	IR: Add COMDATs to the IR	2014-06-27 18:19:56 +00:00
Bitcode	IR: Add COMDATs to the IR	2014-06-27 18:19:56 +00:00
CodeGen	[x86] Generalize BuildVectorSDNode::getConstantSplatValue to work for	2014-07-04 08:11:49 +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	IR: cleanup Module::dropReferences	2014-07-03 16:12:55 +00:00
IRReader	IRReader: don't mark MemoryBuffers const	2014-06-27 09:19:14 +00:00
LineEditor
Linker	Include <tuple> to make buildbots happy	2014-06-27 18:38:12 +00:00
LTO	Fix prefix comparison from r212308	2014-07-04 02:01:54 +00:00
MC	Invert the MC -> Object dependency.	2014-07-03 02:01:39 +00:00
Object	Move createIRObjectFile to the IRObjectFile class and return the concrete type.	2014-07-03 23:03:50 +00:00
Option	Revert "Introduce a string_ostream string builder facilty"	2014-06-26 22:52:05 +00:00
ProfileData
Support	Remove obsolete function TargetRegistry::getClosestTargetForJIT()	2014-07-01 10:47:13 +00:00
TableGen	Revert "Introduce a string_ostream string builder facilty"	2014-06-26 22:52:05 +00:00
Target	[x86] Generalize BuildVectorSDNode::getConstantSplatValue to work for	2014-07-04 08:11:49 +00:00
Transforms	Run interprocedural const prop before global optimizer	2014-07-03 19:28:15 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile