[polly] r332359 - [SI] Create Scop Name lazily
Philip Pfaffe via llvm-commits
llvm-commits at lists.llvm.org
Tue May 15 07:53:25 PDT 2018
Author: pfaffe
Date: Tue May 15 07:53:25 2018
New Revision: 332359
URL: http://llvm.org/viewvc/llvm-project?rev=332359&view=rev
Log:
[SI] Create Scop Name lazily
Summary: Creating the Scop name is expensive, because creating the
Region name it's derived from is expensive. So create the name lazily,
because getName() is actually called rarely.
This is a reiteration of r328666, which introduced a use-after-free and
got reverted in r331363.
Differential Revision: https://reviews.llvm.org/D46868
Modified:
polly/trunk/include/polly/ScopInfo.h
polly/trunk/lib/Analysis/ScopInfo.cpp
Modified: polly/trunk/include/polly/ScopInfo.h
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/include/polly/ScopInfo.h?rev=332359&r1=332358&r2=332359&view=diff
==============================================================================
--- polly/trunk/include/polly/ScopInfo.h (original)
+++ polly/trunk/include/polly/ScopInfo.h Tue May 15 07:53:25 2018
@@ -25,6 +25,7 @@
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/MapVector.h"
+#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
@@ -1717,7 +1718,7 @@ private:
Region &R;
/// The name of the SCoP (identical to the regions name)
- std::string name;
+ Optional<std::string> name;
/// The ID to be assigned to the next Scop in a function
static int NextScopID;
@@ -2455,7 +2456,11 @@ public:
/// could be executed.
bool isEmpty() const { return Stmts.empty(); }
- const StringRef getName() const { return name; }
+ StringRef getName() {
+ if (!name)
+ name = R.getNameStr();
+ return *name;
+ }
using array_iterator = ArrayInfoSetTy::iterator;
using const_array_iterator = ArrayInfoSetTy::const_iterator;
Modified: polly/trunk/lib/Analysis/ScopInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/lib/Analysis/ScopInfo.cpp?rev=332359&r1=332358&r2=332359&view=diff
==============================================================================
--- polly/trunk/lib/Analysis/ScopInfo.cpp (original)
+++ polly/trunk/lib/Analysis/ScopInfo.cpp Tue May 15 07:53:25 2018
@@ -3328,8 +3328,8 @@ Scop::Scop(Region &R, ScalarEvolution &S
DominatorTree &DT, ScopDetection::DetectionContext &DC,
OptimizationRemarkEmitter &ORE)
: IslCtx(isl_ctx_alloc(), isl_ctx_free), SE(&ScalarEvolution), DT(&DT),
- R(R), name(R.getNameStr()), HasSingleExitEdge(R.getExitingBlock()),
- DC(DC), ORE(ORE), Affinator(this, LI),
+ R(R), name(None), HasSingleExitEdge(R.getExitingBlock()), DC(DC),
+ ORE(ORE), Affinator(this, LI),
ID(getNextID((*R.getEntry()->getParent()).getName().str())) {
if (IslOnErrorAbort)
isl_options_set_on_error(getIslCtx().get(), ISL_ON_ERROR_ABORT);
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