Try harder to get the hint by preferring to evict hint interference.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126463 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AllocationOrder.h b/lib/CodeGen/AllocationOrder.h
index 3db4b69..61fd8f8 100644
--- a/lib/CodeGen/AllocationOrder.h
+++ b/lib/CodeGen/AllocationOrder.h
@@ -47,6 +47,8 @@
/// rewind - Start over from the beginning.
void rewind() { Pos = 0; }
+ /// isHint - Return true if PhysReg is a preferred register.
+ bool isHint(unsigned PhysReg) const { return PhysReg == Hint; }
};
} // end namespace llvm
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 03d1372..406485a 100644
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -379,6 +379,9 @@
// Best so far.
BestPhys = PhysReg;
BestWeight = Weight;
+ // Stop if the hint can be used.
+ if (Order.isHint(PhysReg))
+ break;
}
if (!BestPhys)