[llvm] r340898 - [SelectionDAG] Add some comments to ISDOpcodes.h about the operands of MLOAD, MSTORE, MGATHER, MSCATTER. NFC

[Craig Topper via llvm-commits]

Author: ctopper
Date: Tue Aug 28 21:45:32 2018
New Revision: 340898

URL: http://llvm.org/viewvc/llvm-project?rev=340898&view=rev
Log:
[SelectionDAG] Add some comments to ISDOpcodes.h about the operands of MLOAD, MSTORE, MGATHER, MSCATTER. NFC

Modified:
    llvm/trunk/include/llvm/CodeGen/ISDOpcodes.h

Modified: llvm/trunk/include/llvm/CodeGen/ISDOpcodes.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/ISDOpcodes.h?rev=340898&r1=340897&r2=340898&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/ISDOpcodes.h (original)
+++ llvm/trunk/include/llvm/CodeGen/ISDOpcodes.h Tue Aug 28 21:45:32 2018
@@ -786,11 +786,20 @@ namespace ISD {
     // Masked load and store - consecutive vector load and store operations
     // with additional mask operand that prevents memory accesses to the
     // masked-off lanes.
+    //
+    // Val, OutChain = MLOAD(BasePtr, Mask, PassThru)
+    // OutChain = MSTORE(Value, BasePtr, Mask)
     MLOAD, MSTORE,
 
     // Masked gather and scatter - load and store operations for a vector of
     // random addresses with additional mask operand that prevents memory
     // accesses to the masked-off lanes.
+    //
+    // Val, OutChain = GATHER(InChain, PassThru, Mask, BasePtr, Index, Scale)
+    // OutChain = SCATTER(InChain, Value, Mask, BasePtr, Index, Scale)
+    //
+    // The Index operand can have more vector elements than the other operands
+    // due to type legalization. The extra elements are ignored.
     MGATHER, MSCATTER,
 
     /// This corresponds to the llvm.lifetime.* intrinsics. The first operand