diff options
Diffstat (limited to 'lib/CodeGen/PrologEpilogInserter.cpp')
-rw-r--r-- | lib/CodeGen/PrologEpilogInserter.cpp | 87 |
1 files changed, 46 insertions, 41 deletions
diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp index 1ba2c7418f..69ff6b3d92 100644 --- a/lib/CodeGen/PrologEpilogInserter.cpp +++ b/lib/CodeGen/PrologEpilogInserter.cpp @@ -268,51 +268,56 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &F) { } } - if (CSI.empty()) - return; // Early exit if no callee saved registers are modified! - - unsigned NumFixedSpillSlots; - const TargetFrameLowering::SpillSlot *FixedSpillSlots = - TFI->getCalleeSavedSpillSlots(NumFixedSpillSlots); - - // Now that we know which registers need to be saved and restored, allocate - // stack slots for them. - for (std::vector<CalleeSavedInfo>::iterator - I = CSI.begin(), E = CSI.end(); I != E; ++I) { - unsigned Reg = I->getReg(); - const TargetRegisterClass *RC = RegInfo->getMinimalPhysRegClass(Reg); - - int FrameIdx; - if (RegInfo->hasReservedSpillSlot(F, Reg, FrameIdx)) { - I->setFrameIdx(FrameIdx); - continue; - } + if (!TFI->assignCalleeSavedSpillSlots(F, RegInfo, CSI)) { + // If target doesn't implement this, use generic code. + + if (CSI.empty()) + return; // Early exit if no callee saved registers are modified! + + unsigned NumFixedSpillSlots; + const TargetFrameLowering::SpillSlot *FixedSpillSlots = + TFI->getCalleeSavedSpillSlots(NumFixedSpillSlots); + + // Now that we know which registers need to be saved and restored, allocate + // stack slots for them. + for (std::vector<CalleeSavedInfo>::iterator I = CSI.begin(), E = CSI.end(); + I != E; ++I) { + unsigned Reg = I->getReg(); + const TargetRegisterClass *RC = RegInfo->getMinimalPhysRegClass(Reg); + + int FrameIdx; + if (RegInfo->hasReservedSpillSlot(F, Reg, FrameIdx)) { + I->setFrameIdx(FrameIdx); + continue; + } - // Check to see if this physreg must be spilled to a particular stack slot - // on this target. - const TargetFrameLowering::SpillSlot *FixedSlot = FixedSpillSlots; - while (FixedSlot != FixedSpillSlots+NumFixedSpillSlots && - FixedSlot->Reg != Reg) - ++FixedSlot; - - if (FixedSlot == FixedSpillSlots + NumFixedSpillSlots) { - // Nope, just spill it anywhere convenient. - unsigned Align = RC->getAlignment(); - unsigned StackAlign = TFI->getStackAlignment(); - - // We may not be able to satisfy the desired alignment specification of - // the TargetRegisterClass if the stack alignment is smaller. Use the - // min. - Align = std::min(Align, StackAlign); - FrameIdx = MFI->CreateStackObject(RC->getSize(), Align, true); + // Check to see if this physreg must be spilled to a particular stack slot + // on this target. + const TargetFrameLowering::SpillSlot *FixedSlot = FixedSpillSlots; + while (FixedSlot != FixedSpillSlots + NumFixedSpillSlots && + FixedSlot->Reg != Reg) + ++FixedSlot; + + if (FixedSlot == FixedSpillSlots + NumFixedSpillSlots) { + // Nope, just spill it anywhere convenient. + unsigned Align = RC->getAlignment(); + unsigned StackAlign = TFI->getStackAlignment(); + + // We may not be able to satisfy the desired alignment specification of + // the TargetRegisterClass if the stack alignment is smaller. Use the + // min. + Align = std::min(Align, StackAlign); + FrameIdx = MFI->CreateStackObject(RC->getSize(), Align, true); if ((unsigned)FrameIdx < MinCSFrameIndex) MinCSFrameIndex = FrameIdx; if ((unsigned)FrameIdx > MaxCSFrameIndex) MaxCSFrameIndex = FrameIdx; - } else { - // Spill it to the stack where we must. - FrameIdx = MFI->CreateFixedObject(RC->getSize(), FixedSlot->Offset, true); - } + } else { + // Spill it to the stack where we must. + FrameIdx = + MFI->CreateFixedSpillStackObject(RC->getSize(), FixedSlot->Offset); + } - I->setFrameIdx(FrameIdx); + I->setFrameIdx(FrameIdx); + } } MFI->setCalleeSavedInfo(CSI); |