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Remove TargetRegisterInfo::NoRegister.
Fix the TargetRegisterInfo::NoRegister places where someone preferred typing 'TargetRegisterInfo::NoRegister' instead of typing '0'. Note that TableGen is already emitting xx::NoRegister in xxGenRegisterNames.inc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123140 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -295,11 +295,16 @@ protected:
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virtual ~TargetRegisterInfo();
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public:
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enum { // Define some target independent constants
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/// NoRegister - This physical register is not a real target register. It
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/// is useful as a sentinel.
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NoRegister = 0
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};
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// Register numbers can represent physical registers, virtual registers, and
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// sometimes stack slots. The unsigned values are divided into these ranges:
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//
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// 0 Not a register, can be used as a sentinel.
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// [1;2^30) Physical registers assigned by TableGen.
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// [2^30;2^31) Stack slots. (Rarely used.)
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// [2^31;2^32) Virtual registers assigned by MachineRegisterInfo.
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//
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// Further sentinels can be allocated from the small negative integers.
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// DenseMapInfo<unsigned> uses -1u and -2u.
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/// isStackSlot - Sometimes it is useful the be able to store a non-negative
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/// frame index in a variable that normally holds a register. isStackSlot()
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