[llvm] r227118 - Add a FIXME about preferred alignment to DataLayout.

[Eric Christopher]

Author: echristo
Date: Mon Jan 26 13:19:04 2015
New Revision: 227118

URL: http://llvm.org/viewvc/llvm-project?rev=227118&view=rev
Log:
Add a FIXME about preferred alignment to DataLayout.

Essentially DataLayout is global and affects the layout of ABI
level objects. Preferred alignment could change on a per function
basis as we change CPU features.

Modified:
    llvm/trunk/include/llvm/IR/DataLayout.h

Modified: llvm/trunk/include/llvm/IR/DataLayout.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/DataLayout.h?rev=227118&r1=227117&r2=227118&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/DataLayout.h (original)
+++ llvm/trunk/include/llvm/IR/DataLayout.h Mon Jan 26 13:19:04 2015
@@ -53,6 +53,11 @@ enum AlignTypeEnum {
   AGGREGATE_ALIGN = 'a'
 };
 
+// FIXME: Currently the DataLayout string carries a "preferred alignment"
+// for types. As the DataLayout is module/global, this should likely be
+// sunk down to an FTTI element that is queried rather than a global
+// preference.
+
 /// \brief Layout alignment element.
 ///
 /// Stores the alignment data associated with a given alignment type (integer,