diff options
| -rw-r--r-- | lib/CodeGen/RegisterCoalescer.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index 2144137..61dcec2 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -1426,6 +1426,14 @@ bool RegisterCoalescer::JoinIntervals(CoalescerPair &CP) { return true; } + // Check if a register mask clobbers DstReg. + BitVector UsableRegs; + if (LIS->checkRegMaskInterference(RHS, UsableRegs) && + !UsableRegs.test(CP.getDstReg())) { + DEBUG(dbgs() << "\t\tRegister mask interference.\n"); + return false; + } + for (const unsigned *AS = TRI->getAliasSet(CP.getDstReg()); *AS; ++AS){ if (!LIS->hasInterval(*AS)) continue; |