diff options
Diffstat (limited to 'lib/CodeGen/SimpleRegisterCoalescing.cpp')
| -rw-r--r-- | lib/CodeGen/SimpleRegisterCoalescing.cpp | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp index ce72b2f..d25df1d 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp @@ -1671,8 +1671,20 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) { // density, do not join them, instead mark the physical register as its // allocation preference. LiveInterval &JoinVInt = SrcIsPhys ? DstInt : SrcInt; + LiveInterval &JoinPInt = SrcIsPhys ? SrcInt : DstInt; unsigned JoinVReg = SrcIsPhys ? DstReg : SrcReg; unsigned JoinPReg = SrcIsPhys ? SrcReg : DstReg; + + // Don't join with physregs that have a ridiculous number of live + // ranges. The data structure performance is really bad when that + // happens. + if (JoinPInt.ranges.size() > 1000) { + mri_->setRegAllocationHint(JoinVInt.reg, 0, JoinPReg); + ++numAborts; + DEBUG(dbgs() << "\tPhysical register too complicated, abort!\n"); + return false; + } + const TargetRegisterClass *RC = mri_->getRegClass(JoinVReg); unsigned Threshold = allocatableRCRegs_[RC].count() * 2; unsigned Length = li_->getApproximateInstructionCount(JoinVInt); |
