[PATCH] D104394: [MachineCopyPropagation] Fix differences in code gen when compiling with -g

[Kai Luo via Phabricator via llvm-commits]

lkail added inline comments.


================
Comment at: llvm/lib/CodeGen/MachineCopyPropagation.cpp:882
+        // register is changed.
+        for (MCRegUnitIterator RUI(MO.getReg().asMCReg(), TRI); RUI.isValid();
+             ++RUI) {
----------------
```
-      if (MO.readsReg())
-        Tracker.invalidateRegister(MO.getReg().asMCReg(), *TRI);
+      if (MO.readsReg()) {
+        if (MO.isDebug()) {
+          for (MCRegUnitIterator RUI(MO.getReg(), TRI); RUI.isValid(); ++RUI) {
+            if (MachineInstr *Copy = Tracker.findCopyDefViaUnit(*RUI, *TRI)) {
+              CopyDbgUsers[Copy].insert(MI);
+            }
+          }
+        } else {
+          Tracker.invalidateRegister(MO.getReg().asMCReg(), *TRI);
+        }
+      }
```
Doesn't it work?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D104394/new/

https://reviews.llvm.org/D104394