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Add some comments explaining what MVT and EVT are, and how they differ. 

llvm-svn: 118014
This commit is contained in:
Duncan Sands 2010-11-02 13:57:09 +00:00
parent 36eb1ee5eb
commit 68cbbb027a
1 changed files with 10 additions and 3 deletions
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13
llvm/include/llvm/CodeGen/ValueTypes.h
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@ -26,7 +26,10 @@ namespace llvm {
class LLVMContext;
struct EVT;
class MVT { // MVT = Machine Value Type
/// MVT - Machine Value Type. Every type that is supported natively by some
/// processor targeted by LLVM occurs here. This means that any legal value
/// type can be represented by a MVT.
class MVT {
public:
enum SimpleValueType {
// If you change this numbering, you must change the values in
@ -158,7 +161,7 @@ namespace llvm {
return !(NElts & (NElts - 1));
}
/// getPow2VectorType - Widens the length of the given vector EVT up to
/// getPow2VectorType - Widens the length of the given vector MVT up to
/// the nearest power of 2 and returns that type.
MVT getPow2VectorType() const {
if (isPow2VectorType())
@ -353,7 +356,11 @@ namespace llvm {
}
};
struct EVT { // EVT = Extended Value Type
/// EVT - Extended Value Type. Capable of holding value types which are not
/// native for any processor (such as the i12345 type), as well as the types
/// a MVT can represent.
struct EVT {
private:
MVT V;
const Type *LLVMTy;