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Add an option to disable spill hoisting.

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139845 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-09-15 21:06:00 +00:00
parent fd8b851908
commit b9edad0163
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/InlineSpiller.cpp
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@ -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(NumRemats, "Number of rematerialized defs for spilling");
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 @@ void InlineSpiller::propagateSiblingValue(SibValueMap::iterator SVI,
// 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(),