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Document the encoding of MVT::ValueType.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37757 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2007-06-27 15:28:26 +00:00
parent 6445f61806
commit c56b9e9f55
1 changed files with 6 additions and 0 deletions
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6
include/llvm/CodeGen/ValueTypes.h
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@ -82,6 +82,12 @@ namespace MVT { // MVT = Machine Value Types
/// Note that simple doesn't necessary mean legal for the target machine.
/// All legal value types must be simple, but often there are some simple
/// value types that are not legal.
///
/// @internal
/// Currently extended types are always vector types. Extended types are
/// encoded by having the first SimpleTypeBits bits encode the vector
/// element type (which must be a scalar type) and the remaining upper
/// bits encode the vector length, offset by one.
typedef uint32_t ValueType;
static const int SimpleTypeBits = 8;