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Add an option to hide "cold" blocks from CFG graph 

Introduce a new cl::opt to hide "cold" blocks from CFG DOT graphs.
Use BFI to get block relative frequency. Hide the block if the
frequency is below the threshold set by the command line option value.

Reviewed By: davidxl, hoy
Differential Revision: https://reviews.llvm.org/D103640
This commit is contained in:
Artur Pilipenko 2021-06-08 11:26:27 -07:00
parent f673365e1c
commit 9197bac297
1 changed files with 12 additions and 0 deletions
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12
llvm/lib/Analysis/CFGPrinter.cpp
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@ -42,6 +42,10 @@ static cl::opt<bool> HideUnreachablePaths("cfg-hide-unreachable-paths",
static cl::opt<bool> HideDeoptimizePaths("cfg-hide-deoptimize-paths",
cl::init(false));
static cl::opt<double> HideColdPaths(
"cfg-hide-cold-paths", cl::init(0.0),
cl::desc("Hide blocks with relative frequency below the given value"));
static cl::opt<bool> ShowHeatColors("cfg-heat-colors", cl::init(true),
cl::Hidden,
cl::desc("Show heat colors in CFG"));
@ -296,6 +300,14 @@ void DOTGraphTraits<DOTFuncInfo *>::computeDeoptOrUnreachablePaths(
bool DOTGraphTraits<DOTFuncInfo *>::isNodeHidden(const BasicBlock *Node,
const DOTFuncInfo *CFGInfo) {
if (HideColdPaths.getNumOccurrences() > 0)
if (auto *BFI = CFGInfo->getBFI()) {
uint64_t NodeFreq = BFI->getBlockFreq(Node).getFrequency();
uint64_t EntryFreq = BFI->getEntryFreq();
// Hide blocks with relative frequency below HideColdPaths threshold.
if ((double)NodeFreq / EntryFreq < HideColdPaths)
return true;
}
if (HideUnreachablePaths || HideDeoptimizePaths) {
if (isOnDeoptOrUnreachablePath.find(Node) ==
isOnDeoptOrUnreachablePath.end())