Handle more cases in LiveRangeEdit::eliminateDeadDefs.

[oota-llvm.git] / include / llvm / CodeGen / VirtRegMap.h

diff --git a/include/llvm/CodeGen/VirtRegMap.h b/include/llvm/CodeGen/VirtRegMap.h
index ebf42a32ba6e010185aca723da773f0b357b2e51..3bc6ebd563f292b84f2d9f256141098071f3eb9d 100644 (file)
--- a/include/llvm/CodeGen/VirtRegMap.h
+++ b/include/llvm/CodeGen/VirtRegMap.h
@@ -126,13 +126,13 @@ namespace llvm {
       grow();
     }
 
-    /// @brief returns the register allocation preference.
-    unsigned getRegAllocPref(unsigned virtReg);
-
     /// @brief returns true if VirtReg is assigned to its preferred physreg.
-    bool hasPreferredPhys(unsigned VirtReg) {
-      return getPhys(VirtReg) == getRegAllocPref(VirtReg);
-    }
+    bool hasPreferredPhys(unsigned VirtReg);
+
+    /// @brief returns true if VirtReg has a known preferred register.
+    /// This returns false if VirtReg has a preference that is a virtual
+    /// register that hasn't been assigned yet.
+    bool hasKnownPreference(unsigned VirtReg);
 
     /// @brief records virtReg is a split live interval from SReg.
     void setIsSplitFromReg(unsigned virtReg, unsigned SReg) {