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36ae6c1827
llvm-6502/lib/CodeGen/SelectionDAG
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Bill Wendling 36ae6c1827 The DAG combiner was performing a BT combine. The BT combine had a value of -1, 
so it changed it into a 31 via the TLO.ShrinkDemandedConstant() call. Then it
would go through the DAG combiner again. This time it had a value of 31, which
was turned into a -1 by TLI.SimplifyDemandedBits(). This would ping pong
forever.

Teach the TLO.ShrinkDemandedConstant() call not to lower a value if the demanded
value is an XOR of all ones.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65985 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-04 00:18:06 +00:00
..
CallingConvLower.cpp Add "inreg" field to CallSDNode (doesn't increase 2008-09-26 19:31:26 +00:00
CMakeLists.txt Experimental post-pass scheduling support. Post-pass scheduling 2008-11-19 23:18:57 +00:00
DAGCombiner.cpp Fix a problem with DAGCombine on 64b targets where folding 2009-03-01 23:44:07 +00:00
FastISel.cpp Clean up dwarf writer, part 1. This eliminated the horrible recursive getGlobalVariablesUsing and replaced it something readable. It eliminated use of slow UniqueVector and replaced it with StringMap, SmallVector, and DenseMap, etc. It also fixed some non-deterministic behavior. 2009-02-25 07:04:34 +00:00
LegalizeDAG.cpp Revert BuildVectorSDNode related patches: 65426, 65427, and 65296. 2009-02-25 22:49:59 +00:00
LegalizeFloatTypes.cpp bug 3610: Floating point vaarg not softened. 2009-02-21 19:11:18 +00:00
LegalizeIntegerTypes.cpp Revert BuildVectorSDNode related patches: 65426, 65427, and 65296. 2009-02-25 22:49:59 +00:00
LegalizeTypes.cpp Use getDebugLoc forwarder instead of getNode()->getDebugLoc. 2009-02-07 19:59:05 +00:00
LegalizeTypes.h bug 3610: Floating point vaarg not softened. 2009-02-21 19:11:18 +00:00
LegalizeTypesGeneric.cpp Revert BuildVectorSDNode related patches: 65426, 65427, and 65296. 2009-02-25 22:49:59 +00:00
LegalizeVectorTypes.cpp Revert BuildVectorSDNode related patches: 65426, 65427, and 65296. 2009-02-25 22:49:59 +00:00
Makefile Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
ScheduleDAGFast.cpp When scheduling a block in parts, keep track of the overall 2009-02-11 04:27:20 +00:00
ScheduleDAGList.cpp When scheduling a block in parts, keep track of the overall 2009-02-11 04:27:20 +00:00
ScheduleDAGRRList.cpp Oops. Last second clean up messed things up. 2009-02-12 09:52:13 +00:00
ScheduleDAGSDNodes.cpp When scheduling a block in parts, keep track of the overall 2009-02-11 04:27:20 +00:00
ScheduleDAGSDNodes.h When scheduling a block in parts, keep track of the overall 2009-02-11 04:27:20 +00:00
ScheduleDAGSDNodesEmit.cpp When scheduling a block in parts, keep track of the overall 2009-02-11 04:27:20 +00:00
SelectionDAG.cpp Generalize BuildVectorSDNode::isConstantSplat to use APInts and handle 2009-03-02 23:24:16 +00:00
SelectionDAGBuild.cpp Revert BuildVectorSDNode related patches: 65426, 65427, and 65296. 2009-02-25 22:49:59 +00:00
SelectionDAGBuild.h Generate these labels when we're in "fast" mode, not simply when we're no in 2009-02-19 21:12:54 +00:00
SelectionDAGISel.cpp - Use the "Fast" flag instead of "OptimizeForSize" to determine whether to emit 2009-02-24 02:35:30 +00:00
SelectionDAGPrinter.cpp Move ScheduleDAGSDNodes.h to be a private header. Front-ends 2009-02-06 17:22:58 +00:00
TargetLowering.cpp The DAG combiner was performing a BT combine. The BT combine had a value of -1, 2009-03-04 00:18:06 +00:00