diff options
Diffstat (limited to 'lib/CodeGen/LiveIntervalAnalysis.cpp')
| -rw-r--r-- | lib/CodeGen/LiveIntervalAnalysis.cpp | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index b34a65bc64..4d0916046a 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -108,6 +108,7 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) { // compute spill weights const LoopInfo& loopInfo = getAnalysis<LoopInfo>(); + const TargetInstrInfo& tii = tm_->getInstrInfo(); for (MbbIndex2MbbMap::iterator it = mbbi2mbbMap_.begin(), itEnd = mbbi2mbbMap_.end(); @@ -130,6 +131,21 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) { assert(r2iit != r2iMap_.end()); intervals_[r2iit->second].weight += pow(10.0F, loopDepth); } + + // add hints for coalescing + unsigned src, dst; + if (tii.isMoveInstr(*instr, src, dst)) { + if (src >= MRegisterInfo::FirstVirtualRegister) { + Reg2IntervalMap::iterator r2iit = r2iMap_.find(src); + assert(r2iit != r2iMap_.end()); + intervals_[r2iit->second].hint = dst; + } + if (dst >= MRegisterInfo::FirstVirtualRegister) { + Reg2IntervalMap::iterator r2iit = r2iMap_.find(dst); + assert(r2iit != r2iMap_.end()); + intervals_[r2iit->second].hint = src; + } + } } } @@ -329,7 +345,7 @@ void LiveIntervals::computeIntervals() } LiveIntervals::Interval::Interval(unsigned r) - : reg(r), + : reg(r), hint(0), weight((r < MRegisterInfo::FirstVirtualRegister ? std::numeric_limits<float>::max() : 0.0F)) { |