Fixes <rdar://problem/8612856>: During postRAsched, the antidependence

breaker needs to check all definitions of the antidepenent register to
avoid multiple defs of the same new register.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118032 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 2 deletions

diff --git a/lib/CodeGen/CriticalAntiDepBreaker.h b/lib/CodeGen/CriticalAntiDepBreaker.h
index 0ed7c35b0f..df21ef2834 100644
--- a/lib/CodeGen/CriticalAntiDepBreaker.h
+++ b/lib/CodeGen/CriticalAntiDepBreaker.h
@@ -50,6 +50,8 @@ class TargetRegisterInfo;
 
     /// RegRegs - Map registers to all their references within a live range.
     std::multimap<unsigned, MachineOperand *> RegRefs;
+    typedef std::multimap<unsigned, MachineOperand *>::const_iterator
+      RegRefIter;
 
     /// KillIndices - The index of the most recent kill (proceding bottom-up),
     /// or ~0u if the register is not live.
@@ -90,10 +92,14 @@ class TargetRegisterInfo;
   private:
     void PrescanInstruction(MachineInstr *MI);
     void ScanInstruction(MachineInstr *MI, unsigned Count);
-    unsigned findSuitableFreeRegister(MachineInstr *MI,
+    bool isNewRegModifiedByRefs(RegRefIter RegRefBegin,
+                                RegRefIter RegRefEnd,
+                                unsigned NewReg);
+    unsigned findSuitableFreeRegister(RegRefIter RegRefBegin,
+                                      RegRefIter RegRefEnd,
                                       unsigned AntiDepReg,
                                       unsigned LastNewReg,
-                                      const TargetRegisterClass *);
+                                      const TargetRegisterClass *RC);
   };
 }