For PR1064:

Implement the arbitrary bit-width integer feature. The feature allows
integers of any bitwidth (up to 64) to be defined instead of just 1, 8,
16, 32, and 64 bit integers.

This change does several things:
1. Introduces a new Derived Type, IntegerType, to represent the number of
   bits in an integer. The Type classes SubclassData field is used to
   store the number of bits. This allows 2^23 bits in an integer type.
2. Removes the five integer Type::TypeID values for the 1, 8, 16, 32 and
   64-bit integers. These are replaced with just IntegerType which is not
   a primitive any more.
3. Adjust the rest of LLVM to account for this change.

Note that while this incremental change lays the foundation for arbitrary
bit-width integers, LLVM has not yet been converted to actually deal with
them in any significant way. Most optimization passes, for example, will
still only deal with the byte-width integer types.  Future increments
will rectify this situation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33113 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/Bytecode/Reader/Reader.h b/lib/Bytecode/Reader/Reader.h
index 677c39f99f..3e64f2d027 100644
--- a/lib/Bytecode/Reader/Reader.h
+++ b/lib/Bytecode/Reader/Reader.h
@@ -415,6 +415,20 @@ private:
   BytecodeReader(const BytecodeReader &);  // DO NOT IMPLEMENT
   void operator=(const BytecodeReader &);  // DO NOT IMPLEMENT
 
+  // This enum provides the values of the well-known type slots that are always
+  // emitted as the first few types in the table by the BytecodeWriter class.
+  enum WellKnownTypeSlots {
+    VoidTypeSlot = 0, ///< TypeID == VoidTyID
+    FloatTySlot  = 1, ///< TypeID == FloatTyID
+    DoubleTySlot = 2, ///< TypeID == DoubleTyID
+    LabelTySlot  = 3, ///< TypeID == LabelTyID
+    BoolTySlot   = 4, ///< TypeID == IntegerTyID, width = 1
+    Int8TySlot   = 5, ///< TypeID == IntegerTyID, width = 8
+    Int16TySlot  = 6, ///< TypeID == IntegerTyID, width = 16
+    Int32TySlot  = 7, ///< TypeID == IntegerTyID, width = 32
+    Int64TySlot  = 8  ///< TypeID == IntegerTyID, width = 64
+  };
+
 /// @}
 /// @name Reader Primitives
 /// @{