diff options
Diffstat (limited to 'lib/CodeGen/LiveVariables.cpp')
| -rw-r--r-- | lib/CodeGen/LiveVariables.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index 079684e..41b891d 100644 --- a/lib/CodeGen/LiveVariables.cpp +++ b/lib/CodeGen/LiveVariables.cpp @@ -286,7 +286,7 @@ MachineInstr *LiveVariables::FindLastRefOrPartRef(unsigned Reg) { MachineInstr *LastDef = PhysRegDef[Reg]; MachineInstr *LastUse = PhysRegUse[Reg]; if (!LastDef && !LastUse) - return false; + return 0; MachineInstr *LastRefOrPartRef = LastUse ? LastUse : LastDef; unsigned LastRefOrPartRefDist = DistanceMap[LastRefOrPartRef]; @@ -609,7 +609,12 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &mf) { // Finally, if the last instruction in the block is a return, make sure to // mark it as using all of the live-out values in the function. - if (!MBB->empty() && MBB->back().getDesc().isReturn()) { + // Things marked both call and return are tail calls; do not do this for + // them. The tail callee need not take the same registers as input + // that it produces as output, and there are dependencies for its input + // registers elsewhere. + if (!MBB->empty() && MBB->back().getDesc().isReturn() + && !MBB->back().getDesc().isCall()) { MachineInstr *Ret = &MBB->back(); for (MachineRegisterInfo::liveout_iterator |
