diff options
| -rw-r--r-- | llvm/lib/CodeGen/LocalStackSlotAllocation.cpp | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp b/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp index f5b79059d0a..7e1e2873679 100644 --- a/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp +++ b/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp @@ -174,6 +174,7 @@ static inline bool lookupCandidateBaseReg(const SmallVector<std::pair<unsigned, int64_t>, 8> &Regs, std::pair<unsigned, int64_t> &RegOffset, int64_t LocalFrameOffset, + bool StackGrowsDown, const MachineInstr *MI, const TargetRegisterInfo *TRI) { unsigned e = Regs.size(); @@ -182,6 +183,8 @@ lookupCandidateBaseReg(const SmallVector<std::pair<unsigned, int64_t>, 8> &Regs, // Check if the relative offset from the where the base register references // to the target address is in range for the instruction. int64_t Offset = LocalFrameOffset - RegOffset.second; + if (StackGrowsDown) + Offset = -Offset; if (TRI->isFrameOffsetLegal(MI, Offset)) return true; } @@ -199,6 +202,9 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) { MachineFrameInfo *MFI = Fn.getFrameInfo(); const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo(); + const TargetFrameInfo &TFI = *Fn.getTarget().getFrameInfo(); + bool StackGrowsDown = + TFI.getStackGrowthDirection() == TargetFrameInfo::StackGrowsDown; for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) { @@ -245,12 +251,15 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) { // register. std::pair<unsigned, int64_t> RegOffset; if (lookupCandidateBaseReg(BaseRegisters, RegOffset, - LocalOffsets[FrameIdx], MI, TRI)) { + LocalOffsets[FrameIdx], + StackGrowsDown, MI, TRI)) { DEBUG(dbgs() << " Reusing base register " << RegOffset.first << "\n"); // We found a register to reuse. BaseReg = RegOffset.first; Offset = LocalOffsets[FrameIdx] - RegOffset.second; + if (StackGrowsDown) + Offset = -Offset; } else { // No previously defined register was in range, so create a // new one. |
