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from 5349caf [Thumb] Select (CMPZ X, -C) -> (CMPZ (ADDS X, C), 0) new 31bcc1e [SelectionDAG] Ensure DAG::getZeroExtendInReg is called with [...] new f53c395 [ARM] icmp %x, -C can be lowered to a simple ADDS or CMN new b2500d2 [ARM] ADD with a negative offset can become SUB for free
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Summary of changes: lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 2 +- lib/CodeGen/SelectionDAG/TargetLowering.cpp | 4 +- lib/Target/ARM/ARMTargetTransformInfo.cpp | 15 ++++ test/CodeGen/ARM/immcost.ll | 51 +++++++++++++ test/CodeGen/X86/known-bits.ll | 107 ++++++++++++++++++++++++++++ 5 files changed, 176 insertions(+), 3 deletions(-) create mode 100644 test/CodeGen/X86/known-bits.ll