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X86: Add alloca probing to dynamic alloca on Windows. Fixes PR8424.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116984 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer 2010-10-21 01:41:01 +00:00
parent d6865de2d2
commit e9c253e0bc
4 changed files with 26 additions and 23 deletions
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21
lib/Target/X86/X86ISelLowering.cpp
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@ -424,7 +424,7 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
if (Subtarget->is64Bit())
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
if (Subtarget->isTargetCygMing())
if (Subtarget->isTargetCygMing() || Subtarget->isTargetWindows())
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Custom);
else
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
@ -7483,8 +7483,8 @@ SDValue X86TargetLowering::LowerBRCOND(SDValue Op, SelectionDAG &DAG) const {
SDValue
X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
SelectionDAG &DAG) const {
assert(Subtarget->isTargetCygMing() &&
"This should be used only on Cygwin/Mingw targets");
assert(Subtarget->isTargetCygMing() || Subtarget->isTargetWindows() &&
"This should be used only on Windows targets");
DebugLoc dl = Op.getDebugLoc();
// Get the inputs.
@ -7501,7 +7501,7 @@ X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
Chain = DAG.getNode(X86ISD::MINGW_ALLOCA, dl, NodeTys, Chain, Flag);
Chain = DAG.getNode(X86ISD::WIN_ALLOCA, dl, NodeTys, Chain, Flag);
Flag = Chain.getValue(1);
Chain = DAG.getCopyFromReg(Chain, dl, X86StackPtr, SPTy).getValue(1);
@ -8911,7 +8911,7 @@ const char *X86TargetLowering::getTargetNodeName(unsigned Opcode) const {
case X86ISD::PUNPCKHQDQ: return "X86ISD::PUNPCKHQDQ";
case X86ISD::VASTART_SAVE_XMM_REGS: return "X86ISD::VASTART_SAVE_XMM_REGS";
case X86ISD::VAARG_64: return "X86ISD::VAARG_64";
case X86ISD::MINGW_ALLOCA: return "X86ISD::MINGW_ALLOCA";
case X86ISD::WIN_ALLOCA: return "X86ISD::WIN_ALLOCA";
}
}
@ -9874,7 +9874,7 @@ X86TargetLowering::EmitLoweredSelect(MachineInstr *MI,
}
MachineBasicBlock *
X86TargetLowering::EmitLoweredMingwAlloca(MachineInstr *MI,
X86TargetLowering::EmitLoweredWinAlloca(MachineInstr *MI,
MachineBasicBlock *BB) const {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
@ -9884,8 +9884,11 @@ X86TargetLowering::EmitLoweredMingwAlloca(MachineInstr *MI,
// FIXME: The code should be tweaked as soon as we'll try to do codegen for
// mingw-w64.
const char *StackProbeSymbol =
Subtarget->isTargetWindows() ? "_chkstk" : "_alloca";
BuildMI(*BB, MI, DL, TII->get(X86::CALLpcrel32))
.addExternalSymbol("_alloca")
.addExternalSymbol(StackProbeSymbol)
.addReg(X86::EAX, RegState::Implicit)
.addReg(X86::ESP, RegState::Implicit)
.addReg(X86::EAX, RegState::Define | RegState::Implicit)
@ -9952,8 +9955,8 @@ X86TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const {
switch (MI->getOpcode()) {
default: assert(false && "Unexpected instr type to insert");
case X86::MINGW_ALLOCA:
return EmitLoweredMingwAlloca(MI, BB);
case X86::WIN_ALLOCA:
return EmitLoweredWinAlloca(MI, BB);
case X86::TLSCall_32:
case X86::TLSCall_64:
return EmitLoweredTLSCall(MI, BB);

6
lib/Target/X86/X86ISelLowering.h
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@ -253,8 +253,8 @@ namespace llvm {
// with control flow.
VASTART_SAVE_XMM_REGS,
// MINGW_ALLOCA - MingW's __alloca call to do stack probing.
MINGW_ALLOCA,
// WIN_ALLOCA - Windows's _chkstk call to do stack probing.
WIN_ALLOCA,
// ATOMADD64_DAG, ATOMSUB64_DAG, ATOMOR64_DAG, ATOMAND64_DAG,
// ATOMXOR64_DAG, ATOMNAND64_DAG, ATOMSWAP64_DAG -
@ -870,7 +870,7 @@ namespace llvm {
MachineBasicBlock *EmitLoweredSelect(MachineInstr *I,
MachineBasicBlock *BB) const;
MachineBasicBlock *EmitLoweredMingwAlloca(MachineInstr *MI,
MachineBasicBlock *EmitLoweredWinAlloca(MachineInstr *MI,
MachineBasicBlock *BB) const;
MachineBasicBlock *EmitLoweredTLSCall(MachineInstr *MI,

16
lib/Target/X86/X86InstrCompiler.td
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@ -94,18 +94,18 @@ def VAARG_64 : I<0, Pseudo,
(X86vaarg64 addr:$ap, imm:$size, imm:$mode, imm:$align)),
(implicit EFLAGS)]>;
// Dynamic stack allocation yields _alloca call for Cygwin/Mingw targets. Calls
// to _alloca is needed to probe the stack when allocating more than 4k bytes in
// one go. Touching the stack at 4K increments is necessary to ensure that the
// guard pages used by the OS virtual memory manager are allocated in correct
// sequence.
// Dynamic stack allocation yields a _chkstk or _alloca call for all Windows
// targets. These calls are needed to probe the stack when allocating more than
// 4k bytes in one go. Touching the stack at 4K increments is necessary to
// ensure that the guard pages used by the OS virtual memory manager are
// allocated in correct sequence.
// The main point of having separate instruction are extra unmodelled effects
// (compared to ordinary calls) like stack pointer change.
let Defs = [EAX, ESP, EFLAGS], Uses = [ESP] in
def MINGW_ALLOCA : I<0, Pseudo, (outs), (ins),
"# dynamic stack allocation",
[(X86MingwAlloca)]>;
def WIN_ALLOCA : I<0, Pseudo, (outs), (ins),
"# dynamic stack allocation",
[(X86WinAlloca)]>;
}

6
lib/Target/X86/X86InstrInfo.td
View File

@ -202,9 +202,9 @@ def X86and_flag : SDNode<"X86ISD::AND", SDTBinaryArithWithFlags,
def X86mul_imm : SDNode<"X86ISD::MUL_IMM", SDTIntBinOp>;
def X86MingwAlloca : SDNode<"X86ISD::MINGW_ALLOCA", SDTX86Void,
[SDNPHasChain, SDNPInFlag, SDNPOutFlag]>;
def X86WinAlloca : SDNode<"X86ISD::WIN_ALLOCA", SDTX86Void,
[SDNPHasChain, SDNPInFlag, SDNPOutFlag]>;
def X86TLSCall : SDNode<"X86ISD::TLSCALL", SDT_X86TLSCALL,
[]>;