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-rw-r--r--llvm/utils/TableGen/AsmMatcherEmitter.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/utils/TableGen/AsmMatcherEmitter.cpp b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
index 019908bd599..8c37c3aabe0 100644
--- a/llvm/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/llvm/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)
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