diff options
Diffstat (limited to 'llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp | 62 |
1 files changed, 45 insertions, 17 deletions
diff --git a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp index 25402147bf5..43ff10b98cb 100644 --- a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp +++ b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp @@ -149,6 +149,10 @@ static cl::opt<unsigned> ShrinkLimit("shrink-frame-limit", cl::init(UINT_MAX), cl::Hidden, cl::ZeroOrMore, cl::desc("Max count of stack frame " "shrink-wraps")); +static cl::opt<bool> EnableSaveRestoreLong("enable-save-restore-long", + cl::Hidden, cl::desc("Enable long calls for save-restore stubs."), + cl::init(false), cl::ZeroOrMore); + static cl::opt<bool> UseAllocframe("use-allocframe", cl::init(true), cl::Hidden, cl::desc("Use allocframe more conservatively")); @@ -342,7 +346,7 @@ void HexagonFrameLowering::findShrunkPrologEpilog(MachineFunction &MF, ShrinkCounter++; } - auto &HST = static_cast<const HexagonSubtarget&>(MF.getSubtarget()); + auto &HST = MF.getSubtarget<HexagonSubtarget>(); auto &HRI = *HST.getRegisterInfo(); MachineDominatorTree MDT; @@ -440,7 +444,7 @@ void HexagonFrameLowering::findShrunkPrologEpilog(MachineFunction &MF, /// in one place allows shrink-wrapping of the stack frame. void HexagonFrameLowering::emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const { - auto &HST = static_cast<const HexagonSubtarget&>(MF.getSubtarget()); + auto &HST = MF.getSubtarget<HexagonSubtarget>(); auto &HRI = *HST.getRegisterInfo(); MachineFrameInfo *MFI = MF.getFrameInfo(); @@ -581,7 +585,7 @@ void HexagonFrameLowering::insertEpilogueInBlock(MachineBasicBlock &MBB) const { if (!hasFP(MF)) return; - auto &HST = static_cast<const HexagonSubtarget&>(MF.getSubtarget()); + auto &HST = MF.getSubtarget<HexagonSubtarget>(); auto &HII = *HST.getInstrInfo(); auto &HRI = *HST.getRegisterInfo(); unsigned SP = HRI.getStackRegister(); @@ -1049,7 +1053,8 @@ bool HexagonFrameLowering::insertCSRSpillsInBlock(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI = MBB.begin(); PrologueStubs = false; MachineFunction &MF = *MBB.getParent(); - auto &HII = *MF.getSubtarget<HexagonSubtarget>().getInstrInfo(); + auto &HST = MF.getSubtarget<HexagonSubtarget>(); + auto &HII = *HST.getInstrInfo(); if (useSpillFunction(MF, CSI)) { PrologueStubs = true; @@ -1059,20 +1064,31 @@ bool HexagonFrameLowering::insertCSRSpillsInBlock(MachineBasicBlock &MBB, StkOvrFlowEnabled); auto &HTM = static_cast<const HexagonTargetMachine&>(MF.getTarget()); bool IsPIC = HTM.isPositionIndependent(); + bool LongCalls = HST.useLongCalls() || EnableSaveRestoreLong; // Call spill function. DebugLoc DL = MI != MBB.end() ? MI->getDebugLoc() : DebugLoc(); unsigned SpillOpc; - if (StkOvrFlowEnabled) - SpillOpc = IsPIC ? Hexagon::SAVE_REGISTERS_CALL_V4STK_PIC - : Hexagon::SAVE_REGISTERS_CALL_V4STK; - else - SpillOpc = IsPIC ? Hexagon::SAVE_REGISTERS_CALL_V4_PIC - : Hexagon::SAVE_REGISTERS_CALL_V4; + if (StkOvrFlowEnabled) { + if (LongCalls) + SpillOpc = IsPIC ? Hexagon::SAVE_REGISTERS_CALL_V4STK_EXT_PIC + : Hexagon::SAVE_REGISTERS_CALL_V4STK_EXT; + else + SpillOpc = IsPIC ? Hexagon::SAVE_REGISTERS_CALL_V4STK_PIC + : Hexagon::SAVE_REGISTERS_CALL_V4STK; + } else { + if (LongCalls) + SpillOpc = IsPIC ? Hexagon::SAVE_REGISTERS_CALL_V4_EXT_PIC + : Hexagon::SAVE_REGISTERS_CALL_V4_EXT; + else + SpillOpc = IsPIC ? Hexagon::SAVE_REGISTERS_CALL_V4_PIC + : Hexagon::SAVE_REGISTERS_CALL_V4; + } MachineInstr *SaveRegsCall = BuildMI(MBB, MI, DL, HII.get(SpillOpc)) .addExternalSymbol(SpillFun); + // Add callee-saved registers as use. addCalleeSaveRegistersAsImpOperand(SaveRegsCall, CSI, false, true); // Add live in registers. @@ -1104,7 +1120,8 @@ bool HexagonFrameLowering::insertCSRRestoresInBlock(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI = MBB.getFirstTerminator(); MachineFunction &MF = *MBB.getParent(); - auto &HII = *MF.getSubtarget<HexagonSubtarget>().getInstrInfo(); + auto &HST = MF.getSubtarget<HexagonSubtarget>(); + auto &HII = *HST.getInstrInfo(); if (useRestoreFunction(MF, CSI)) { bool HasTC = hasTailCall(MBB) || !hasReturn(MBB); @@ -1113,6 +1130,7 @@ bool HexagonFrameLowering::insertCSRRestoresInBlock(MachineBasicBlock &MBB, const char *RestoreFn = getSpillFunctionFor(MaxR, Kind); auto &HTM = static_cast<const HexagonTargetMachine&>(MF.getTarget()); bool IsPIC = HTM.isPositionIndependent(); + bool LongCalls = HST.useLongCalls() || EnableSaveRestoreLong; // Call spill function. DebugLoc DL = MI != MBB.end() ? MI->getDebugLoc() @@ -1120,17 +1138,27 @@ bool HexagonFrameLowering::insertCSRRestoresInBlock(MachineBasicBlock &MBB, MachineInstr *DeallocCall = nullptr; if (HasTC) { - unsigned ROpc = IsPIC ? Hexagon::RESTORE_DEALLOC_BEFORE_TAILCALL_V4_PIC - : Hexagon::RESTORE_DEALLOC_BEFORE_TAILCALL_V4; - DeallocCall = BuildMI(MBB, MI, DL, HII.get(ROpc)) + unsigned RetOpc; + if (LongCalls) + RetOpc = IsPIC ? Hexagon::RESTORE_DEALLOC_BEFORE_TAILCALL_V4_EXT_PIC + : Hexagon::RESTORE_DEALLOC_BEFORE_TAILCALL_V4_EXT; + else + RetOpc = IsPIC ? Hexagon::RESTORE_DEALLOC_BEFORE_TAILCALL_V4_PIC + : Hexagon::RESTORE_DEALLOC_BEFORE_TAILCALL_V4; + DeallocCall = BuildMI(MBB, MI, DL, HII.get(RetOpc)) .addExternalSymbol(RestoreFn); } else { // The block has a return. MachineBasicBlock::iterator It = MBB.getFirstTerminator(); assert(It->isReturn() && std::next(It) == MBB.end()); - unsigned ROpc = IsPIC ? Hexagon::RESTORE_DEALLOC_RET_JMP_V4_PIC - : Hexagon::RESTORE_DEALLOC_RET_JMP_V4; - DeallocCall = BuildMI(MBB, It, DL, HII.get(ROpc)) + unsigned RetOpc; + if (LongCalls) + RetOpc = IsPIC ? Hexagon::RESTORE_DEALLOC_RET_JMP_V4_EXT_PIC + : Hexagon::RESTORE_DEALLOC_RET_JMP_V4_EXT; + else + RetOpc = IsPIC ? Hexagon::RESTORE_DEALLOC_RET_JMP_V4_PIC + : Hexagon::RESTORE_DEALLOC_RET_JMP_V4; + DeallocCall = BuildMI(MBB, It, DL, HII.get(RetOpc)) .addExternalSymbol(RestoreFn); // Transfer the function live-out registers. DeallocCall->copyImplicitOps(MF, *It); |
