[llvm] r349879 - GlobalISel: Correct example PartialMapping table

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Thu Dec 20 19:03:12 2018
New Revision: 349879

URL: http://llvm.org/viewvc/llvm-project?rev=349879&view=rev
Log:
GlobalISel: Correct example PartialMapping table

When I try to use this, it seems like the second half needs
to start where the previous part left off.

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=349879&r1=349878&r2=349879&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h (original)
+++ llvm/trunk/include/llvm/CodeGen/GlobalISel/RegisterBankInfo.h Thu Dec 20 19:03:12 2018
@@ -103,8 +103,8 @@ public:
   /// Currently the TableGen-like file would look like:
   /// \code
   /// PartialMapping[] = {
-  /// /*32-bit add*/ {0, 32, GPR},
-  /// /*2x32-bit add*/ {0, 32, GPR}, {0, 32, GPR}, // <-- Same entry 3x
+  /// /*32-bit add*/    {0, 32, GPR}, // Scalar entry repeated for first vec elt.
+  /// /*2x32-bit add*/  {0, 32, GPR}, {32, 32, GPR},
   /// /*<2x32-bit> vadd {0, 64, VPR}
   /// }; // PartialMapping duplicated.
   ///
@@ -118,14 +118,15 @@ public:
   /// With the array of pointer, we would have:
   /// \code
   /// PartialMapping[] = {
-  /// /*32-bit add*/ {0, 32, GPR},
+  /// /*32-bit add lower */ {0, 32, GPR},
+  /// /*32-bit add upper */ {32, 32, GPR},
   /// /*<2x32-bit> vadd {0, 64, VPR}
   /// }; // No more duplication.
   ///
   /// BreakDowns[] = {
   /// /*AddBreakDown*/ &PartialMapping[0],
-  /// /*2xAddBreakDown*/ &PartialMapping[0], &PartialMapping[0],
-  /// /*VAddBreakDown*/ &PartialMapping[1]
+  /// /*2xAddBreakDown*/ &PartialMapping[0], &PartialMapping[1],
+  /// /*VAddBreakDown*/ &PartialMapping[2]
   /// }; // Addresses of PartialMapping duplicated (smaller).
   ///
   /// ValueMapping[] {