Andrea Di Biagio 3996e5290a [DAG] Further improve the logic in DAGCombiner that folds a pair of shuffles into a single shuffle if the resulting mask is legal. ... This patch teaches the DAGCombiner how to fold shuffles according to the following new rules: 1. shuffle(shuffle(x, y), undef) -> x 2. shuffle(shuffle(x, y), undef) -> y 3. shuffle(shuffle(x, y), undef) -> shuffle(x, undef) 4. shuffle(shuffle(x, y), undef) -> shuffle(y, undef) The backend avoids to combine shuffles according to rules 3. and 4. if the resulting shuffle does not have a legal mask. This is to avoid introducing illegal shuffles that are potentially expanded into a sub-optimal sequence of target specific dag nodes during vector legalization. Added test case combine-vec-shuffle-2.ll to verify that we correctly triggers the new rules when combining shuffles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212748 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-10 18:04:55 +00:00
..
CMakeLists.txt
DAGCombiner.cpp	[DAG] Further improve the logic in DAGCombiner that folds a pair of shuffles into a single shuffle if the resulting mask is legal.	2014-07-10 18:04:55 +00:00
FastISel.cpp	Move function dependent resetting of a subtarget variable out of the	2014-07-04 01:55:26 +00:00
FunctionLoweringInfo.cpp	[Modules] Remove potential ODR violations by sinking the DEBUG_TYPE	2014-04-22 02:02:50 +00:00
InstrEmitter.cpp	This reapplies r207235 with an additional bugfixes caught by the msan	2014-04-25 20:49:25 +00:00
InstrEmitter.h	Revert "Give internal classes hidden visibility."	2013-09-11 18:05:11 +00:00
LegalizeDAG.cpp	Make it possible for ints/floats to return different values from getBooleanContents()	2014-07-10 10:18:12 +00:00
LegalizeFloatTypes.cpp	[Modules] Remove potential ODR violations by sinking the DEBUG_TYPE	2014-04-22 02:02:50 +00:00
LegalizeIntegerTypes.cpp	Make it possible for ints/floats to return different values from getBooleanContents()	2014-07-10 10:18:12 +00:00
LegalizeTypes.cpp	Make it possible for ints/floats to return different values from getBooleanContents()	2014-07-10 10:18:12 +00:00
LegalizeTypes.h	[x86,SDAG] Introduce any- and sign-extend-vector-inreg nodes analogous	2014-07-10 12:32:32 +00:00
LegalizeTypesGeneric.cpp	Fix ppcf128 component access on little-endian systems	2014-07-03 15:06:47 +00:00
LegalizeVectorOps.cpp	[x86,SDAG] Introduce any- and sign-extend-vector-inreg nodes analogous	2014-07-10 12:32:32 +00:00
LegalizeVectorTypes.cpp	[x86,SDAG] Introduce any- and sign-extend-vector-inreg nodes analogous	2014-07-10 12:32:32 +00:00
LLVMBuild.txt
Makefile
ResourcePriorityQueue.cpp	Fix 'platform-specific' hyphenations	2014-06-30 18:57:16 +00:00
ScheduleDAGFast.cpp	[Modules] Remove potential ODR violations by sinking the DEBUG_TYPE	2014-04-22 02:02:50 +00:00
ScheduleDAGRRList.cpp	The hazard recognizer only needs a subtarget, not a target machine	2014-06-13 22:38:52 +00:00
ScheduleDAGSDNodes.cpp	Convert SelectionDAG::MorphNodeTo to use ArrayRef.	2014-04-27 19:21:16 +00:00
ScheduleDAGSDNodes.h	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-16 04:21:27 +00:00
ScheduleDAGVLIW.cpp	The hazard recognizer only needs a subtarget, not a target machine	2014-06-13 22:38:52 +00:00
SDNodeDbgValue.h	This reapplies r207235 with an additional bugfixes caught by the msan	2014-04-25 20:49:25 +00:00
SelectionDAG.cpp	[x86,SDAG] Introduce any- and sign-extend-vector-inreg nodes analogous	2014-07-10 12:32:32 +00:00
SelectionDAGBuilder.cpp	Fix ppcf128 component access on little-endian systems	2014-07-03 15:06:47 +00:00
SelectionDAGBuilder.h	Fix 'platform-specific' hyphenations	2014-06-30 18:57:16 +00:00
SelectionDAGDumper.cpp	[x86,SDAG] Introduce any- and sign-extend-vector-inreg nodes analogous	2014-07-10 12:32:32 +00:00
SelectionDAGISel.cpp	Revert "Introduce a string_ostream string builder facilty"	2014-06-26 22:52:05 +00:00
SelectionDAGPrinter.cpp	Revert "Introduce a string_ostream string builder facilty"	2014-06-26 22:52:05 +00:00
TargetLowering.cpp	Make it possible for ints/floats to return different values from getBooleanContents()	2014-07-10 10:18:12 +00:00
TargetSelectionDAGInfo.cpp	Have TargetSelectionDAGInfo take a DataLayout initializer rather than	2014-06-06 19:04:48 +00:00