Vendor import of llvm trunk r242221:

https://llvm.org/svn/llvm-project/llvm/trunk@242221

1 files changed, 7 insertions, 5 deletions

diff --git a/lib/CodeGen/ExecutionDepsFix.cpp b/lib/CodeGen/ExecutionDepsFix.cpp
index 5b09cf1..201f9c1 100644
--- a/lib/CodeGen/ExecutionDepsFix.cpp
+++ b/lib/CodeGen/ExecutionDepsFix.cpp
@@ -733,12 +733,14 @@ bool ExeDepsFix::runOnMachineFunction(MachineFunction &mf) {
   // If no relevant registers are used in the function, we can skip it
   // completely.
   bool anyregs = false;
+  const MachineRegisterInfo &MRI = mf.getRegInfo();
   for (TargetRegisterClass::const_iterator I = RC->begin(), E = RC->end();
-       I != E; ++I)
-    if (MF->getRegInfo().isPhysRegUsed(*I)) {
-      anyregs = true;
-      break;
-    }
+       I != E && !anyregs; ++I)
+    for (MCRegAliasIterator AI(*I, TRI, true); AI.isValid(); ++AI)
+      if (!MRI.reg_nodbg_empty(*AI)) {
+        anyregs = true;
+        break;
+      }
   if (!anyregs) return false;
 
   // Initialize the AliasMap on the first use.