X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FRegisterCoalescer.h;h=e57ceab37d0dda7c48b57c2f2b44cc4104e786b5;hb=82a35bf01a894b0af8871071df9180c6ab6fe639;hp=ef0c5080860452af361e6d5dbac90c0b64094d06;hpb=7842a741eb0e1baa35af8c3bb5884655c1edaa9e;p=oota-llvm.git

diff --git a/lib/CodeGen/RegisterCoalescer.h b/lib/CodeGen/RegisterCoalescer.h
index ef0c5080860..e57ceab37d0 100644
--- a/lib/CodeGen/RegisterCoalescer.h
+++ b/lib/CodeGen/RegisterCoalescer.h
@@ -26,7 +26,6 @@ namespace llvm {
   /// two registers can be coalesced, CoalescerPair can determine if a copy
   /// instruction would become an identity copy after coalescing.
   class CoalescerPair {
-    const TargetInstrInfo &TII;
     const TargetRegisterInfo &TRI;
 
     /// DstReg - The register that will be left after coalescing. It can be a
@@ -36,10 +35,13 @@ namespace llvm {
     /// SrcReg - the virtual register that will be coalesced into dstReg.
     unsigned SrcReg;
 
-    /// subReg_ - The subregister index of srcReg in DstReg. It is possible the
-    /// coalesce SrcReg into a subreg of the larger DstReg when DstReg is a
-    /// virtual register.
-    unsigned SubIdx;
+    /// DstIdx - The sub-register index of the old DstReg in the new coalesced
+    /// register.
+    unsigned DstIdx;
+
+    /// SrcIdx - The sub-register index of the old SrcReg in the new coalesced
+    /// register.
+    unsigned SrcIdx;
 
     /// Partial - True when the original copy was a partial subregister copy.
     bool Partial;
@@ -47,18 +49,26 @@ namespace llvm {
     /// CrossClass - True when both regs are virtual, and newRC is constrained.
     bool CrossClass;
 
-    /// Flipped - True when DstReg and SrcReg are reversed from the oriignal
+    /// Flipped - True when DstReg and SrcReg are reversed from the original
     /// copy instruction.
     bool Flipped;
 
     /// NewRC - The register class of the coalesced register, or NULL if DstReg
-    /// is a physreg.
+    /// is a physreg. This register class may be a super-register of both
+    /// SrcReg and DstReg.
     const TargetRegisterClass *NewRC;
 
   public:
-    CoalescerPair(const TargetInstrInfo &tii, const TargetRegisterInfo &tri)
-      : TII(tii), TRI(tri), DstReg(0), SrcReg(0), SubIdx(0),
-        Partial(false), CrossClass(false), Flipped(false), NewRC(0) {}
+    CoalescerPair(const TargetRegisterInfo &tri)
+      : TRI(tri), DstReg(0), SrcReg(0), DstIdx(0), SrcIdx(0),
+        Partial(false), CrossClass(false), Flipped(false), NewRC(nullptr) {}
+
+    /// Create a CoalescerPair representing a virtreg-to-physreg copy.
+    /// No need to call setRegisters().
+    CoalescerPair(unsigned VirtReg, unsigned PhysReg,
+                  const TargetRegisterInfo &tri)
+      : TRI(tri), DstReg(PhysReg), SrcReg(VirtReg), DstIdx(0), SrcIdx(0),
+        Partial(false), CrossClass(false), Flipped(false), NewRC(nullptr) {}
 
     /// setRegisters - set registers to match the copy instruction MI. Return
     /// false if MI is not a coalescable copy instruction.
@@ -94,9 +104,13 @@ namespace llvm {
     /// getSrcReg - Return the virtual register that will be coalesced away.
     unsigned getSrcReg() const { return SrcReg; }
 
-    /// getSubIdx - Return the subregister index in DstReg that SrcReg will be
-    /// coalesced into, or 0.
-    unsigned getSubIdx() const { return SubIdx; }
+    /// getDstIdx - Return the subregister index that DstReg will be coalesced
+    /// into, or 0.
+    unsigned getDstIdx() const { return DstIdx; }
+
+    /// getSrcIdx - Return the subregister index that SrcReg will be coalesced
+    /// into, or 0.
+    unsigned getSrcIdx() const { return SrcIdx; }
 
     /// getNewRC - Return the register class of the coalesced register.
     const TargetRegisterClass *getNewRC() const { return NewRC; }