[llvm] r217968 - R600/SI: Rough first implementation of shouldClusterLoads

[Matt Arsenault]

Author: arsenm
Date: Wed Sep 17 12:48:30 2014
New Revision: 217968

URL: http://llvm.org/viewvc/llvm-project?rev=217968&view=rev
Log:
R600/SI: Rough first implementation of shouldClusterLoads

Modified:
    llvm/trunk/lib/Target/R600/SIInstrInfo.cpp
    llvm/trunk/lib/Target/R600/SIInstrInfo.h

Modified: llvm/trunk/lib/Target/R600/SIInstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/R600/SIInstrInfo.cpp?rev=217968&r1=217967&r2=217968&view=diff
==============================================================================
--- llvm/trunk/lib/Target/R600/SIInstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/R600/SIInstrInfo.cpp Wed Sep 17 12:48:30 2014
@@ -260,6 +260,28 @@ bool SIInstrInfo::getLdStBaseRegImmOfs(M
   return false;
 }
 
+bool SIInstrInfo::shouldClusterLoads(MachineInstr *FirstLdSt,
+                                     MachineInstr *SecondLdSt,
+                                     unsigned NumLoads) const {
+  unsigned Opc0 = FirstLdSt->getOpcode();
+  unsigned Opc1 = SecondLdSt->getOpcode();
+
+  // TODO: This needs finer tuning
+  if (NumLoads > 4)
+    return false;
+
+  if (isDS(Opc0) && isDS(Opc1))
+    return true;
+
+  if (isSMRD(Opc0) && isSMRD(Opc1))
+    return true;
+
+  if ((isMUBUF(Opc0) || isMTBUF(Opc0)) && (isMUBUF(Opc1) || isMTBUF(Opc1)))
+    return true;
+
+  return false;
+}
+
 void
 SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
                          MachineBasicBlock::iterator MI, DebugLoc DL,

Modified: llvm/trunk/lib/Target/R600/SIInstrInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/R600/SIInstrInfo.h?rev=217968&r1=217967&r2=217968&view=diff
==============================================================================
--- llvm/trunk/lib/Target/R600/SIInstrInfo.h (original)
+++ llvm/trunk/lib/Target/R600/SIInstrInfo.h Wed Sep 17 12:48:30 2014
@@ -70,6 +70,10 @@ public:
                             unsigned &BaseReg, unsigned &Offset,
                             const TargetRegisterInfo *TRI) const final;
 
+  bool shouldClusterLoads(MachineInstr *FirstLdSt,
+                          MachineInstr *SecondLdSt,
+                          unsigned NumLoads) const final;
+
   void copyPhysReg(MachineBasicBlock &MBB,
                    MachineBasicBlock::iterator MI, DebugLoc DL,
                    unsigned DestReg, unsigned SrcReg,