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Disable fancy splitting during spilling unless -extra-spiller-splits is given.

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This way, InlineSpiller does the same amount of splitting as the standard
spiller. Splitting should really be guided by the register allocator, and
doesn't belong in the spiller at all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118216 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-11-04 00:32:32 +00:00
parent 806e80ef42
commit 8c42f48d02
1 changed files with 18 additions and 8 deletions
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26
lib/CodeGen/InlineSpiller.cpp
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@ -35,6 +35,10 @@ using namespace llvm;
static cl::opt<bool>
VerifySpills("verify-spills", cl::desc("Verify after each spill/split"));
static cl::opt<bool>
ExtraSpillerSplits("extra-spiller-splits",
cl::desc("Enable additional splitting during splitting"));
namespace {
class InlineSpiller : public Spiller {
MachineFunctionPass &pass_;
@ -116,10 +120,13 @@ bool InlineSpiller::split() {
splitAnalysis_.analyze(&edit_->getParent());
// Try splitting around loops.
if (const MachineLoop *loop = splitAnalysis_.getBestSplitLoop()) {
SplitEditor(splitAnalysis_, lis_, vrm_, mdt_, *edit_)
.splitAroundLoop(loop);
return true;
if (ExtraSpillerSplits) {
const MachineLoop *loop = splitAnalysis_.getBestSplitLoop();
if (loop) {
SplitEditor(splitAnalysis_, lis_, vrm_, mdt_, *edit_)
.splitAroundLoop(loop);
return true;
}
}
// Try splitting into single block intervals.
@ -131,10 +138,13 @@ bool InlineSpiller::split() {
}
// Try splitting inside a basic block.
if (const MachineBasicBlock *MBB = splitAnalysis_.getBlockForInsideSplit()) {
SplitEditor(splitAnalysis_, lis_, vrm_, mdt_, *edit_)
.splitInsideBlock(MBB);
return true;
if (ExtraSpillerSplits) {
const MachineBasicBlock *MBB = splitAnalysis_.getBlockForInsideSplit();
if (MBB){
SplitEditor(splitAnalysis_, lis_, vrm_, mdt_, *edit_)
.splitInsideBlock(MBB);
return true;
}
}
return false;