[llvm-commits] [llvm] r112756 - /llvm/trunk/lib/CodeGen/RegAllocLinearScan.cpp

[Jim Grosbach]

Author: grosbach
Date: Wed Sep  1 17:48:34 2010
New Revision: 112756

URL: http://llvm.org/viewvc/llvm-project?rev=112756&view=rev
Log:
Tweak to ignoring reserved regs. The allocator was occasionally still looking
at them since they'd end up in the register weights list. Tell it to stop
doing that.

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

Modified: llvm/trunk/lib/CodeGen/RegAllocLinearScan.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegAllocLinearScan.cpp?rev=112756&r1=112755&r2=112756&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegAllocLinearScan.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegAllocLinearScan.cpp Wed Sep  1 17:48:34 2010
@@ -1147,9 +1147,11 @@
            e = RC->allocation_order_end(*mf_); i != e; ++i) {
       unsigned reg = *i;
       float regWeight = SpillWeights[reg];
+      // Don't even consider reserved regs.
+      if (reservedRegs_.test(reg))
+        continue;
       // Skip recently allocated registers and reserved registers.
-      if (minWeight > regWeight && !isRecentlyUsed(reg) &&
-          !reservedRegs_.test(reg))
+      if (minWeight > regWeight && !isRecentlyUsed(reg))
         Found = true;
       RegsWeights.push_back(std::make_pair(reg, regWeight));
     }