1 files changed, 5 insertions, 9 deletions
diff --git a/llvm/lib/MC/MCInstrDesc.cpp b/llvm/lib/MC/MCInstrDesc.cpp
index ee55f3eff3a..53cba864a85 100644
--- a/llvm/lib/MC/MCInstrDesc.cpp
+++ b/llvm/lib/MC/MCInstrDesc.cpp
@@ -39,15 +39,6 @@ bool MCInstrDesc::mayAffectControlFlow(const MCInst &MI,
     return false;
   if (hasDefOfPhysReg(MI, PC, RI))
     return true;
-  // A variadic instruction may define PC in the variable operand list.
-  // There's currently no indication of which entries in a variable
-  // list are defs and which are uses. While that's the case, this function
-  // needs to assume they're defs in order to be conservatively correct.
-  for (int i = NumOperands, e = MI.getNumOperands(); i != e; ++i) {
-    if (MI.getOperand(i).isReg() &&
-        RI.isSubRegisterEq(PC, MI.getOperand(i).getReg()))
-      return true;
-  }
   return false;
 }
 
@@ -66,5 +57,10 @@ bool MCInstrDesc::hasDefOfPhysReg(const MCInst &MI, unsigned Reg,
     if (MI.getOperand(i).isReg() &&
         RI.isSubRegisterEq(Reg, MI.getOperand(i).getReg()))
       return true;
+  if (variadicOpsAreDefs())
+    for (int i = NumOperands - 1, e = MI.getNumOperands(); i != e; ++i)
+      if (MI.getOperand(i).isReg() &&
+          RI.isSubRegisterEq(Reg, MI.getOperand(i).getReg()))
+        return true;
   return hasImplicitDefOfPhysReg(Reg, &RI);
 }