[llvm] r265704 - [RegisterBankInfo] Add more details on the expectation of

[Quentin Colombet via llvm-commits]

Author: qcolombet
Date: Thu Apr  7 13:07:07 2016
New Revision: 265704

URL: http://llvm.org/viewvc/llvm-project?rev=265704&view=rev
Log:
[RegisterBankInfo] Add more details on the expectation of
getInstrMapping.

Modified:
    llvm/trunk/include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h

Modified: llvm/trunk/include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h?rev=265704&r1=265703&r2=265704&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h (original)
+++ llvm/trunk/include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h Thu Apr  7 13:07:07 2016
@@ -281,6 +281,11 @@ public:
   /// Get the mapping of the different operands of \p MI
   /// on the register bank.
   /// This mapping should be the direct translation of \p MI.
+  /// In other words, when \p MI is mapped with the returned mapping,
+  /// only the register banks of the operands of \p MI need to be updated.
+  /// In particular, neither the opcode or the type of \p MI needs to be
+  /// updated for this direct mapping.
+  ///
   /// The target independent implementation gives a mapping based on
   /// the register classes for the target specific opcode.
   /// It uses the ID RegisterBankInfo::DefaultMappingID for that mapping.