[llvm-commits] [llvm] r71230 - /llvm/trunk/include/llvm/Target/TargetData.h

[Duncan Sands]

Author: baldrick
Date: Fri May  8 12:49:48 2009
New Revision: 71230

URL: http://llvm.org/viewvc/llvm-project?rev=71230&view=rev
Log:
Add some examples to show the difference between
the various notions of type size used in LLVM.

Modified:
    llvm/trunk/include/llvm/Target/TargetData.h

Modified: llvm/trunk/include/llvm/Target/TargetData.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetData.h?rev=71230&r1=71229&r2=71230&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Target/TargetData.h (original)
+++ llvm/trunk/include/llvm/Target/TargetData.h Fri May  8 12:49:48 2009
@@ -155,6 +155,23 @@
   /// Target pointer size, in bits
   unsigned char getPointerSizeInBits()   const { return 8*PointerMemSize; }
 
+  /// Size examples:
+  ///
+  /// Type        SizeInBits  StoreSizeInBits  PaddedSizeInBits[*]
+  /// ----        ----------  ---------------  ----------------
+  ///  i1            1           8                8
+  ///  i8            8           8                8
+  ///  i19          19          24               32
+  ///  i32          32          32               32
+  ///  i100        100         104              128
+  ///  i128        128         128              128
+  ///  Float        32          32               32
+  ///  Double       64          64               64
+  ///  X86_FP80     80          80               96
+  ///
+  /// [*] The padded size depends on the alignment, and thus on the target.
+  ///     These values are for x86-32 linux.
+
   /// getTypeSizeInBits - Return the number of bits necessary to hold the
   /// specified type.  For example, returns 36 for i36 and 80 for x86_fp80.
   uint64_t getTypeSizeInBits(const Type* Ty) const;