Fix UnitTests/2005-05-12-Int64ToFP.c with llc-beta. In particular, do not

allow it to go into an infinite loop, filling up the disk!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30494 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 7 deletions

diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp
index 5b9186dbe3..e42603e629 100644
--- a/lib/CodeGen/RegAllocLocal.cpp
+++ b/lib/CodeGen/RegAllocLocal.cpp
@@ -621,18 +621,21 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
       for (const unsigned *ImplicitDefs = TID.ImplicitDefs;
            *ImplicitDefs; ++ImplicitDefs) {
         unsigned Reg = *ImplicitDefs;
-        if (PhysRegsUsed[Reg] == -2) continue;
-
-        spillPhysReg(MBB, MI, Reg, true);
-        PhysRegsUseOrder.push_back(Reg);
-        PhysRegsUsed[Reg] = 0;            // It is free and reserved now
+        bool IsNonAllocatable = PhysRegsUsed[Reg] == -2;
+        if (!IsNonAllocatable) {
+          spillPhysReg(MBB, MI, Reg, true);
+          PhysRegsUseOrder.push_back(Reg);
+          PhysRegsUsed[Reg] = 0;            // It is free and reserved now
+        }
         PhysRegsEverUsed[Reg] = true;
 
         for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
              *AliasSet; ++AliasSet) {
           if (PhysRegsUsed[*AliasSet] != -2) {
-            PhysRegsUseOrder.push_back(*AliasSet);
-            PhysRegsUsed[*AliasSet] = 0;  // It is free and reserved now
+            if (!IsNonAllocatable) {
+              PhysRegsUseOrder.push_back(*AliasSet);
+              PhysRegsUsed[*AliasSet] = 0;  // It is free and reserved now
+            }
             PhysRegsEverUsed[*AliasSet] = true;
           }
         }