[TableGen] Fix invalid comparison function `SizeOrder` in `getMatchingSubClassWithSubRegs`
Building LLVM with -DEXPENSIVE_CHECKS fails with the following error
message with libstdc++ in debug mode:
Error: comparison doesn't meet irreflexive requirements,
assert(!(a < a)).
The patch fixes the comparison function SizeOrder by returning false
when comparing two equal items.
diff --git a/llvm/utils/TableGen/CodeGenRegisters.cpp b/llvm/utils/TableGen/CodeGenRegisters.cpp
index eeb715d..18a2de1 100644
--- a/llvm/utils/TableGen/CodeGenRegisters.cpp
+++ b/llvm/utils/TableGen/CodeGenRegisters.cpp
@@ -999,6 +999,8 @@
const CodeGenRegisterClass *B) {
// If there are multiple, identical register classes, prefer the original
// register class.
+ if (A == B)
+ return false;
if (A->getMembers().size() == B->getMembers().size())
return A == this;
return A->getMembers().size() > B->getMembers().size();
