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BlockPlacement: add a flag to force cold block outlining w/o a profile. 

NFC.

llvm-svn: 310129
This commit is contained in:
Kyle Butt 2017-08-04 21:13:41 +00:00
parent 92e584cb48
commit 74f61dd8ef
1 changed files with 6 additions and 1 deletions
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7
llvm/lib/CodeGen/MachineBlockPlacement.cpp
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@ -91,6 +91,11 @@ static cl::opt<unsigned> LoopToColdBlockRatio(
"(frequency of block) is greater than this ratio"),
cl::init(5), cl::Hidden);
static cl::opt<bool> ForceLoopColdBlock(
"force-loop-cold-block",
cl::desc("Force outlining cold blocks from loops."),
cl::init(false), cl::Hidden);
static cl::opt<bool>
PreciseRotationCost("precise-rotation-cost",
cl::desc("Model the cost of loop rotation more "
@ -2146,7 +2151,7 @@ MachineBlockPlacement::collectLoopBlockSet(const MachineLoop &L) {
// will be merged into the first outer loop chain for which this block is not
// cold anymore. This needs precise profile data and we only do this when
// profile data is available.
if (F->getFunction()->getEntryCount()) {
if (F->getFunction()->getEntryCount() || ForceLoopColdBlock) {
BlockFrequency LoopFreq(0);
for (auto LoopPred : L.getHeader()->predecessors())
if (!L.contains(LoopPred))