[llvm-commits] [llvm] r112742 - /llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp

[Jim Grosbach]

Author: grosbach
Date: Wed Sep  1 16:23:03 2010
New Revision: 112742

URL: http://llvm.org/viewvc/llvm-project?rev=112742&view=rev
Log:
The register allocator shouldn't consider allocating reserved registers. PBQP version.

Modified:
    llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp

Modified: llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp?rev=112742&r1=112741&r2=112742&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegAllocPBQP.cpp Wed Sep  1 16:23:03 2010
@@ -587,6 +587,8 @@
   // Resize allowedSets container appropriately.
   allowedSets.resize(vregIntervalsToAlloc.size());
 
+  BitVector ReservedRegs = tri->getReservedRegs(*mf);
+
   // Iterate over virtual register intervals to compute allowed sets...
   for (unsigned node = 0; node < node2LI.size(); ++node) {
 
@@ -595,8 +597,12 @@
     const TargetRegisterClass *liRC = mri->getRegClass(li->reg);
 
     // Start by assuming all allocable registers in the class are allowed...
-    RegVector liAllowed(liRC->allocation_order_begin(*mf),
-                        liRC->allocation_order_end(*mf));
+    RegVector liAllowed;
+    TargetRegisterClass::iterator aob = liRC->allocation_order_begin(*mf);
+    TargetRegisterClass::iterator aoe = liRC->allocation_order_end(*mf);
+    for (TargetRegisterClass::iterator it = aob; it != aoe; ++it)
+      if (!ReservedRegs.test(*it))
+        liAllowed.push_back(*it);
 
     // Eliminate the physical registers which overlap with this range, along
     // with all their aliases.