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Do not modify a cl::opt programmatically, global mutable state is evil. 

Found by TSAN on ThinLTO.

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 266514
This commit is contained in:
Mehdi Amini 2016-04-16 04:58:30 +00:00
parent a77d073305
commit 59ae854503
1 changed files with 13 additions and 9 deletions
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20
llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
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@ -62,10 +62,19 @@ static cl::opt<unsigned> HugeRegion("dag-maps-huge-region", cl::Hidden,
"prior to scheduling, at which point a trade-off "
"is made to avoid excessive compile time."));
static cl::opt<unsigned> ReductionSize("dag-maps-reduction-size", cl::Hidden,
static cl::opt<unsigned> ReductionSize(
"dag-maps-reduction-size", cl::Hidden,
cl::desc("A huge scheduling region will have maps reduced by this many "
"nodes at a time. Defaults to HugeRegion / 2."));
static unsigned getReductionSize() {
// Always reduce a huge region with half of the elements, except
// when user sets this number explicitly.
if (ReductionSize.getNumOccurrences() == 0)
return HugeRegion / 2;
return ReductionSize;
}
static void dumpSUList(ScheduleDAGInstrs::SUList &L) {
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
dbgs() << "{ ";
@ -878,11 +887,6 @@ void ScheduleDAGInstrs::buildSchedGraph(AliasAnalysis *AA,
// done.
Value2SUsMap NonAliasStores, NonAliasLoads(1 /*TrueMemOrderLatency*/);
// Always reduce a huge region with half of the elements, except
// when user sets this number explicitly.
if (ReductionSize.getNumOccurrences() == 0)
ReductionSize = (HugeRegion / 2);
// Remove any stale debug info; sometimes BuildSchedGraph is called again
// without emitting the info from the previous call.
DbgValues.clear();
@ -1077,11 +1081,11 @@ void ScheduleDAGInstrs::buildSchedGraph(AliasAnalysis *AA,
// Reduce maps if they grow huge.
if (Stores.size() + Loads.size() >= HugeRegion) {
DEBUG(dbgs() << "Reducing Stores and Loads maps.\n";);
reduceHugeMemNodeMaps(Stores, Loads, ReductionSize);
reduceHugeMemNodeMaps(Stores, Loads, getReductionSize());
}
if (NonAliasStores.size() + NonAliasLoads.size() >= HugeRegion) {
DEBUG(dbgs() << "Reducing NonAliasStores and NonAliasLoads maps.\n";);
reduceHugeMemNodeMaps(NonAliasStores, NonAliasLoads, ReductionSize);
reduceHugeMemNodeMaps(NonAliasStores, NonAliasLoads, getReductionSize());
}
}