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Lower dynamic stack allocation on mingw32 to separate instruction.
We cannot use a normal call here since it has extra unmodelled side effects (it changes stack pointer). This should fix PR5292. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97884 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -6418,24 +6418,13 @@ X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
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EVT IntPtr = getPointerTy();
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EVT SPTy = Subtarget->is64Bit() ? MVT::i64 : MVT::i32;
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Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
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Chain = DAG.getCopyToReg(Chain, dl, X86::EAX, Size, Flag);
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Flag = Chain.getValue(1);
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SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
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SDValue Ops[] = { Chain,
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DAG.getTargetExternalSymbol("_alloca", IntPtr),
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DAG.getRegister(X86::EAX, IntPtr),
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DAG.getRegister(X86StackPtr, SPTy),
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Flag };
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Chain = DAG.getNode(X86ISD::CALL, dl, NodeTys, Ops, 5);
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Flag = Chain.getValue(1);
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SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
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Chain = DAG.getCALLSEQ_END(Chain,
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DAG.getIntPtrConstant(0, true),
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DAG.getIntPtrConstant(0, true),
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Flag);
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Chain = DAG.getNode(X86ISD::MINGW_ALLOCA, dl, NodeTys, Chain, Flag);
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Flag = Chain.getValue(1);
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Chain = DAG.getCopyFromReg(Chain, dl, X86StackPtr, SPTy).getValue(1);
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@ -7741,6 +7730,7 @@ const char *X86TargetLowering::getTargetNodeName(unsigned Opcode) const {
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case X86ISD::MUL_IMM: return "X86ISD::MUL_IMM";
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case X86ISD::PTEST: return "X86ISD::PTEST";
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case X86ISD::VASTART_SAVE_XMM_REGS: return "X86ISD::VASTART_SAVE_XMM_REGS";
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case X86ISD::MINGW_ALLOCA: return "X86ISD::MINGW_ALLOCA";
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}
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}
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@ -8410,6 +8400,29 @@ X86TargetLowering::EmitLoweredSelect(MachineInstr *MI,
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return BB;
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}
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MachineBasicBlock *
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X86TargetLowering::EmitLoweredMingwAlloca(MachineInstr *MI,
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MachineBasicBlock *BB,
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DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
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const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
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DebugLoc DL = MI->getDebugLoc();
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MachineFunction *F = BB->getParent();
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// The lowering is pretty easy: we're just emitting the call to _alloca. The
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// non-trivial part is impdef of ESP.
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// FIXME: The code should be tweaked as soon as we'll try to do codegen for
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// mingw-w64.
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BuildMI(BB, DL, TII->get(X86::CALLpcrel32))
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.addExternalSymbol("_alloca")
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.addReg(X86::EAX, RegState::Implicit)
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.addReg(X86::ESP, RegState::Implicit)
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.addReg(X86::EAX, RegState::Define | RegState::Implicit)
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.addReg(X86::ESP, RegState::Define | RegState::Implicit);
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F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
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return BB;
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}
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MachineBasicBlock *
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X86TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
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@ -8417,6 +8430,8 @@ X86TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
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DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
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switch (MI->getOpcode()) {
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default: assert(false && "Unexpected instr type to insert");
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case X86::MINGW_ALLOCA:
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return EmitLoweredMingwAlloca(MI, BB, EM);
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case X86::CMOV_GR8:
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case X86::CMOV_V1I64:
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case X86::CMOV_FR32:
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@ -249,6 +249,9 @@ namespace llvm {
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// with control flow.
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VASTART_SAVE_XMM_REGS,
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// MINGW_ALLOCA - MingW's __alloca call to do stack probing.
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MINGW_ALLOCA,
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// ATOMADD64_DAG, ATOMSUB64_DAG, ATOMOR64_DAG, ATOMAND64_DAG,
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// ATOMXOR64_DAG, ATOMNAND64_DAG, ATOMSWAP64_DAG -
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// Atomic 64-bit binary operations.
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@ -259,6 +262,10 @@ namespace llvm {
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ATOMAND64_DAG,
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ATOMNAND64_DAG,
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ATOMSWAP64_DAG
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// WARNING: Do not add anything in the end unless you want the node to
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// have memop! In fact, starting from ATOMADD64_DAG all opcodes will be
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// thought as target memory ops!
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};
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}
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@ -790,6 +797,10 @@ namespace llvm {
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MachineBasicBlock *BB,
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DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
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MachineBasicBlock *EmitLoweredMingwAlloca(MachineInstr *MI,
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MachineBasicBlock *BB,
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DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
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/// Emit nodes that will be selected as "test Op0,Op0", or something
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/// equivalent, for use with the given x86 condition code.
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SDValue EmitTest(SDValue Op0, unsigned X86CC, SelectionDAG &DAG);
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@ -65,7 +65,7 @@ def SDT_X86VASTART_SAVE_XMM_REGS : SDTypeProfile<0, -1, [SDTCisVT<0, i8>,
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def SDTX86RepStr : SDTypeProfile<0, 1, [SDTCisVT<0, OtherVT>]>;
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def SDTX86RdTsc : SDTypeProfile<0, 0, []>;
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def SDTX86Void : SDTypeProfile<0, 0, []>;
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def SDTX86Wrapper : SDTypeProfile<1, 1, [SDTCisSameAs<0, 1>, SDTCisPtrTy<0>]>;
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@ -143,7 +143,7 @@ def X86rep_movs: SDNode<"X86ISD::REP_MOVS", SDTX86RepStr,
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[SDNPHasChain, SDNPInFlag, SDNPOutFlag, SDNPMayStore,
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SDNPMayLoad]>;
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def X86rdtsc : SDNode<"X86ISD::RDTSC_DAG",SDTX86RdTsc,
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def X86rdtsc : SDNode<"X86ISD::RDTSC_DAG", SDTX86Void,
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[SDNPHasChain, SDNPOutFlag, SDNPSideEffect]>;
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def X86Wrapper : SDNode<"X86ISD::Wrapper", SDTX86Wrapper>;
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@ -178,6 +178,9 @@ def X86and_flag : SDNode<"X86ISD::AND", SDTBinaryArithWithFlags,
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def X86mul_imm : SDNode<"X86ISD::MUL_IMM", SDTIntBinOp>;
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def X86MingwAlloca : SDNode<"X86ISD::MINGW_ALLOCA", SDTX86Void,
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[SDNPHasChain, SDNPInFlag, SDNPOutFlag]>;
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//===----------------------------------------------------------------------===//
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// X86 Operand Definitions.
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//
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@ -519,7 +522,7 @@ def ADJCALLSTACKUP32 : I<0, Pseudo, (outs), (ins i32imm:$amt1, i32imm:$amt2),
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}
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// x86-64 va_start lowering magic.
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let usesCustomInserter = 1 in
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let usesCustomInserter = 1 in {
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def VASTART_SAVE_XMM_REGS : I<0, Pseudo,
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(outs),
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(ins GR8:$al,
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@ -530,6 +533,11 @@ def VASTART_SAVE_XMM_REGS : I<0, Pseudo,
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imm:$regsavefi,
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imm:$offset)]>;
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def MINGW_ALLOCA : I<0, Pseudo, (outs), (ins),
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"call __alloca",
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[(X86MingwAlloca)]>;
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}
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// Nop
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let neverHasSideEffects = 1 in {
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def NOOP : I<0x90, RawFrm, (outs), (ins), "nop", []>;
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@ -1057,7 +1057,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
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.addImm(NumBytes);
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BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
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.addExternalSymbol("_alloca");
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.addExternalSymbol("_alloca")
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.addReg(StackPtr, RegState::Define | RegState::Implicit);
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} else {
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// Save EAX
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BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
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@ -1068,7 +1069,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
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.addImm(NumBytes - 4);
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BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
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.addExternalSymbol("_alloca");
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.addExternalSymbol("_alloca")
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.addReg(StackPtr, RegState::Define | RegState::Implicit);
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// Restore EAX
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MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),
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