AsmMatcher: Add a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94261 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index 019908bd599b234a1b0503d154ccfd5c0af291a6..8c37c3aabe0a0ea408898db44a290784e9c3be04 100644 (file)
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -465,6 +465,10 @@ struct InstructionInfo {
     if (Operands.size() != RHS.Operands.size())
       return false;
 
+    // Otherwise, make sure the ordering of the two instructions is unambiguous
+    // by checking that either (a) a token or operand kind discriminates them,
+    // or (b) the ordering among equivalent kinds is consistent.
+
     // Tokens and operand kinds are unambiguous (assuming a correct target
     // specific parser).
     for (unsigned i = 0, e = Operands.size(); i != e; ++i)