[llvm-commits] [llvm] r139845 - /llvm/trunk/lib/CodeGen/InlineSpiller.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Thu Sep 15 16:06:00 2011
New Revision: 139845

URL: http://llvm.org/viewvc/llvm-project?rev=139845&view=rev
Log:
Add an option to disable spill hoisting.

When -split-spill-mode is enabled, spill hoisting is performed by
SplitKit instead of by InlineSpiller.  This hidden command line option
is for testing the splitter spill mode.

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

Modified: llvm/trunk/lib/CodeGen/InlineSpiller.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/InlineSpiller.cpp?rev=139845&r1=139844&r2=139845&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/InlineSpiller.cpp (original)
+++ llvm/trunk/lib/CodeGen/InlineSpiller.cpp Thu Sep 15 16:06:00 2011
@@ -28,6 +28,7 @@
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 
@@ -45,6 +46,9 @@
 STATISTIC(NumOmitReloadSpill, "Number of omitted spills of reloads");
 STATISTIC(NumHoists,          "Number of hoisted spills");
 
+static cl::opt<bool> DisableHoisting("disable-spill-hoist", cl::Hidden,
+                                     cl::desc("Disable inline spill hoisting"));
+
 namespace {
 class InlineSpiller : public Spiller {
   MachineFunctionPass &Pass;
@@ -367,7 +371,7 @@
 
     // Should this value be propagated as a preferred spill candidate?  We don't
     // propagate values of registers that are about to spill.
-    bool PropSpill = !isRegToSpill(SV.SpillReg);
+    bool PropSpill = !DisableHoisting && !isRegToSpill(SV.SpillReg);
     unsigned SpillDepth = ~0u;
 
     for (TinyPtrVector<VNInfo*>::iterator DepI = Deps->begin(),