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Add comments to INSERT_SUBREG, EXTRACT_SURBEG, SUBREG_TO_REG,
and IMPLICIT_DEF. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68949 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -50,9 +50,29 @@ public:
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EH_LABEL = 3,
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GC_LABEL = 4,
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DECLARE = 5,
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/// EXTRACT_SUBREG - This instruction takes two operands: a register
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/// that has subregisters, and a subregister index. It returns the
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/// extracted subregister value. This is commonly used to implement
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/// truncation operations on target architectures which support it.
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EXTRACT_SUBREG = 6,
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/// INSERT_SUBREG - This instruction takes three operands: a register
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/// that has subregisters, a register providing an insert value, and a
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/// subregister index. It returns the value of the first register with
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/// the value of the second register inserted. The first register is
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/// often defined by an IMPLICIT_DEF, as is commonly used to implement
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/// anyext operations on target architectures which support it.
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INSERT_SUBREG = 7,
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/// IMPLICIT_DEF - This is the MachineInstr-level equivalent of undef.
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IMPLICIT_DEF = 8,
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/// SUBREG_TO_REG - This instruction is similar to INSERT_SUBREG except
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/// that the first operand is an immediate integer constant. This constant
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/// is often zero, as is commonly used to implement zext operations on
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/// target architectures which support it, such as with x86-64 (with
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/// zext from i32 to i64 via implicit zero-extension).
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SUBREG_TO_REG = 9
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};
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