commit 27a08935ca4ccf2121c2cf4bfbf148e2382c7762
author Chris Lattner <sabre@nondot.org> Tue Oct 22 23:16:21 2002 +0000
committer Chris Lattner <sabre@nondot.org> Tue Oct 22 23:16:21 2002 +0000
tree ba43dd696226bb33a6a2a16e009132b2b5b24418
parent 4bdb9b7ebee8f671754c5b7a2c0ca11f520c2aaf

  - Two minor improvements to the MachineInstr class to reduce footprint and
    overhead: Merge 3 parallel vectors into 1, change regsUsed hash_set to be a
    bitvector.  Sped up LLC a little less than 10% in a debug build!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4261 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/RegAlloc/PhyRegAlloc.cpp

diff --git a/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp b/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
index c97028a..5fc6a4d 100644
--- a/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
+++ b/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
@@ -691,10 +691,10 @@
   int scratchReg = -1;
   if (MRI.regTypeNeedsScratchReg(RegType, scratchRegType))
     {
-      scratchReg = this->getUsableUniRegAtMI(scratchRegType, &LVSetBef,
-                                             MInst, MIBef, MIAft);
+      scratchReg = getUsableUniRegAtMI(scratchRegType, &LVSetBef,
+                                       MInst, MIBef, MIAft);
       assert(scratchReg != MRI.getInvalidRegNum());
-      MInst->getRegsUsed().insert(scratchReg); 
+      MInst->insertUsedReg(scratchReg); 
     }
   
   if (!isDef || isDefAndUse) {
@@ -774,7 +774,7 @@
         // of copying it to memory and back.  But we have to mark the
         // register as used by this instruction, so it does not get used
         // as a scratch reg. by another operand or anyone else.
-        MInst->getRegsUsed().insert(scratchReg); 
+        MInst->insertUsedReg(scratchReg); 
         MRI.cpReg2RegMI(MIBef, RegU, scratchReg, RegType);
         MRI.cpReg2RegMI(MIAft, scratchReg, RegU, RegType);
       }
@@ -874,12 +874,11 @@
   // Add the registers already marked as used by the instruction. 
   // This should include any scratch registers that are used to save
   // values across the instruction (e.g., for saving state register values).
-  const hash_set<int>& regsUsed = MInst->getRegsUsed();
-  for (hash_set<int>::const_iterator SI=regsUsed.begin(), SE=regsUsed.end();
-       SI != SE; ++SI)
-    {
+  const vector<bool> &regsUsed = MInst->getRegsUsed();
+  for (unsigned i = 0, e = regsUsed.size(); i != e; ++i)
+    if (regsUsed[i]) {
       unsigned classId = 0;
-      int classRegNum = MRI.getClassRegNum(*SI, classId);
+      int classRegNum = MRI.getClassRegNum(i, classId);
       if (RC->getID() == classId)
         {
           assert(classRegNum < (int) IsColorUsedArr.size() &&