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Added -precompute-phys-liveness for testing LiveIntervals updates.

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llvm-svn: 184573
This commit is contained in:
Andrew Trick 2013-06-21 18:33:23 +00:00
parent 54670161c3
commit 5d17d8d8d7
1 changed files with 14 additions and 0 deletions
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14
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -52,6 +52,14 @@ INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
INITIALIZE_PASS_END(LiveIntervals, "liveintervals",
"Live Interval Analysis", false, false)
#ifndef NDEBUG
static cl::opt<bool> EnablePrecomputePhysRegs(
"precompute-phys-liveness", cl::Hidden,
cl::desc("Eagerly compute live intervals for all physreg units."));
#else
static bool EnablePrecomputePhysRegs = false;
#endif // NDEBUG
void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesCFG();
AU.addRequired<AliasAnalysis>();
@ -116,6 +124,12 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
computeRegMasks();
computeLiveInRegUnits();
if (EnablePrecomputePhysRegs) {
// For stress testing, precompute live ranges of all physical register
// units, including reserved registers.
for (unsigned i = 0, e = TRI->getNumRegUnits(); i != e; ++i)
getRegUnit(i);
}
DEBUG(dump());
return true;
}